CN102175553A - Gas sensor based on bacteria cellulose and manufacturing method thereof - Google Patents
Gas sensor based on bacteria cellulose and manufacturing method thereof Download PDFInfo
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Abstract
本发明涉及一种基于细菌纤维素的气体传感器，包括石英晶体微天平复合电极、石英基片和传感材料，所述的石英晶体微天平复合电极置于石英基片中央，所述的石英晶体微天平复合电极由石英晶体微天平电极和膜组成，所述的膜贴附于石英晶体微天平电极表面，所述的传感材料分散在膜中，所述的膜为细菌纤维素膜。本发明还涉及一种基于细菌纤维素的气体传感器的制备方法，包括以下步骤：将细菌纤维素和蒸馏水均质化得到均匀分散的混合物，滴涂分散在洁净干燥的石英晶体微天平电极表面，滴涂传感材料后再次干燥后即为传感器。本发明的优点为成本低，灵敏度高，可重复使用，长期稳定性及选择性好，制备工艺简单，容易实现批量化生产。The invention relates to a gas sensor based on bacterial cellulose, comprising a quartz crystal microbalance composite electrode, a quartz substrate and a sensing material, the quartz crystal microbalance composite electrode is placed in the center of the quartz substrate, and the quartz crystal The microbalance compound electrode is composed of a quartz crystal microbalance electrode and a film, the film is attached to the surface of the quartz crystal microbalance electrode, the sensing material is dispersed in the film, and the film is a bacterial cellulose film. The present invention also relates to a preparation method of a gas sensor based on bacterial cellulose, comprising the following steps: homogenizing the bacterial cellulose and distilled water to obtain a uniformly dispersed mixture, drop-coating and dispersing it on the surface of a clean and dry quartz crystal microbalance electrode, After the sensing material is drip-coated and dried again, it becomes a sensor. The invention has the advantages of low cost, high sensitivity, reusability, good long-term stability and selectivity, simple preparation process and easy realization of batch production.
Description
Technical field
Background technology
As everyone knows, toxic gas detects to be used very extensive in daily life, industry, agricultural and environmental protection field, especially at building materials, in household products and the various industrial processes, along with people improve gradually to environmental protection and health problem degree of concern, highly sensitive gas detection method will be very important.And the method for traditional detection toxic gas spectrophotometric method for example, vapor-phase chromatography, detection method sensitivity such as Electrochemical Detection are lower, and need large-scale expensive complicated laboratory equipment, complex operation, consuming time longer, can not satisfy the demand of the monitoring of real-time on a large scale, and testing result is subjected to the influence of other gas easily.Therefore, be necessary to formulate one highly sensitive, easy, fast, can continuous monitoring detect the method for toxic gas.
QCM (Quartz Crystal Microbalance) (QCM) sensor is a kind of microsensor of nanogram level mass-sensitive type, its principle mainly is the piezoelectric effect according to quartz crystal, when quartz crystal is applied alternating voltage, quartz crystal will vibrate, when the natural frequency of the frequency of oscillatory circuit and quartz crystal is consistent, just produce resonance, this moment, vibration was the most stable.Quartz crystal oscillator has stable natural frequency, and under certain condition, when other material of quartz crystal oscillator surface adsorption, the natural frequency of quartz crystal oscillator changes with the nanogram magnitude quality size variation that causes after adsorbing.Qcm sensor is exactly according to this principle, do one deck sensitive thin film on the quartz crystal surface, utilize the interaction of sensitive thin film and test substance, the concentration signal of test substance is converted into frequency signal to be detected, it has highly sensitive, and the response time is short, and persistence is good, reversibility and advantage such as easy to operate detect at small quality testing, toxic gas, aspects such as the mensuration of microcomponent in the solution and analysis have obtained widespread use.
The sensitive membrane of using in the QCM gas sensor is mainly metallic films such as organic polymer sensitive membrane, metal-oxide film, Pt etc.Wherein with the organic polymer sensitive thin film use at most, coating method commonly used has cotton balls swabbing process, syringe drop-coating, spraying process, dipping method etc.And according to the mechanism of adhesion, be coated with intermembranous adhesion mainly from the acting force between the molecule---Van der Waals force, the inner polymer polarity group that forms of class coating material, as-OH base or-the COOH base, produce under the effect of Van der Waals force or hydrogen bond action power with the polar molecule on quartz wafer surface and to adhere to balance, form adhesion.Therefore, class coating material must adapt with the polarity on quartz wafer surface, has only both to mate mutually, just can obtain adhesion preferably.The sensing coated film is to be equal to tested organic molecule by hydrogen bond, polar molecule, dispersion force and hole power or chemical reaction to interact, thereby tested organic molecule is carried out quality Identification.
Electrostatic spinning nano fiber mainly contains two kinds of methods in sensor application: first kind is to adopt to carry out the electrospinning silk and obtain the nanofiber with inducing function as PAA (polyacrylic acid), PANI functional polymers such as (polyanilines), and with electrospinning silk nanofiber directly as the sensing element of sensor, this manufacturing process is comparatively simple, the sensor response time that makes is very fast, sensitivity is higher, and has bio-compatibility preferably; Second kind be with electrospinning silk nanofiber as template, deposit corresponding inductive material and carry out chemical modification at fiber surface then, thereby make micro nano structure with sensing characteristics." Nanofibrous polyethyleneimine membranes as sensitive coatings for quartz crystal microbalance-based formaldehyde sensors " by the polyethyleneimine film that adopts static to spin acquisition apply the QCM electrode preparation detection limit be the formaldehyde sensor of 10ppm; " Electrospun nanofibrous membranes coated quartz crystal microbalance as gas sensor for NH
3Detection " prepare the nanofiber that diameter is 100-400nm by electrostatic spinning PVA and PAA mixed solution, and it is deposited on to have prepared detection limit on the QCM electrode be the ammonia gas sensor of 50ppm.Electrostatic spinning adopts the shower nozzle spining technology, and process is to outside conditional request height, and properties of product are subjected to temperature easily, humidity is waited for influence, and spinning efficiency is lower, is difficult for realizing industrial-scale production; Solvent evaporates is very fast in spinning process, is difficult to control the volatilization of toxic solvent, causes environmental pollution, and unfavorable to staff's health; If electrostatic spinning does not change gathering-device in addition, generally can only obtain not having the nonwoven fabrics of orientation, intensity is low, need just can further use after the aftertreatment, and the spinning of many shower nozzles is difficult to realize because of electrical charge rejection.
Present stage, electrostatic spinning gained nanofiber diameter generally was about 100nm～800nm, along with reducing of fibre diameter, its specific surface area will increase, and the specific surface area of sensing material is the key factor that influences qcm sensor sensitivity, the specific surface area increase will further increase the adsorption site of detected gas, therefore will improve transducer sensitivity largely if can adopt the following nano material of fibre diameter 100nm to make up sensing layer.
Summary of the invention
The purpose of this invention is to provide a kind of gas sensor based on bacteria cellulose, the present invention adopts to have the cancellated bacteria cellulose nano material of 3 D stereo and is deposited on the QCM (Quartz Crystal Microbalance) electrode surface and obtains combination electrode, then combining with sensing material forms a kind of sensitive membrane that is deposited on the QCM (Quartz Crystal Microbalance) electrode surface, obtains sensor thereby make up.Bacteria cellulose fibre is a kind of biosynthetic nanofiber; have unique physical and chemical performances and mechanical property; high-crystallinity, high moisture holding capacity, mesh nanometer structure, high-tensile and elastic modulus and excellent biocompatibility and biodegradability; accomplish scale production at present; having solved electrostatic spinning nano fiber yields poorly; a difficult problem that is difficult to suitability for industrialized production, prospect is widely used.Its diameter is about 30-60nm, thereby deposit on the QCM (Quartz Crystal Microbalance) electrode with adhesion such as the polar molecule generation Van der Waals force on quartz crystal surface, hydrogen bonds, utilize the pore diameter distribution and the superhigh specific surface area of its meticulous tridimensional network, Nano grade (to be about 50m again
2/ g), make sensing material enter the inside of bacteria cellulose porous structure easily, more contact with the nanometer fento, the great amount of hydroxy group that contains by the fento surface is as avtive spot, with sensing material generation physisorption or chemical action, thereby on the QCM (Quartz Crystal Microbalance) electrode, prepare the sensitive membrane of high-specific surface area.Therefore, can increase considerably the adsorption reaction site of detected gas, in actual detected with the sensitivity that greatly improves sensor after pick-up unit combines.Contain a large amount of highly active hydroxyls just because of the bacteria cellulose surface, mechanical property excellence (elastic modulus is more than ten times of general vegetable fibre), the wide performance that waits excellence of flexibility (adaptability) of operation, so it is low, highly sensitive, reusable that this transducer production method has a cost, long-time stability and selectivity are good, preparation technology is simple, realizes mass production easily, has solved the deficiency of at present existing gas detection method.
Such as the QCM formaldehyde gas sensor, because formaldehyde is the metastable material of a kind of chemical property, can tie water in air and carbon dioxide be converted into formic acid, thereby the faintly acid of showing, therefore when the preparation sensitive membrane, can select amine substance, the macromolecular material of band amido atomic group, the sensing material of alkalescent material, as the polypropylene-base amine hydrochlorate, polyethyleneimine, triethanolamine etc., by drip be coated in the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose after, utilize the interaction of hydrogen bond of great amount of hydroxy group group that BC nanofiber surface exists and amine groups to prepare the sensitive membrane of the high-specific surface area that sticks to the QCM (Quartz Crystal Microbalance) electrode surface, thereby make the adsorption site of this sensor PARA FORMALDEHYDE PRILLS(91,95) improve greatly, its detection limit can reach 30PPb in practical operation.
A kind of gas sensor of the present invention based on bacteria cellulose, comprise QCM (Quartz Crystal Microbalance) combination electrode, quartz substrate and sensing material, described QCM (Quartz Crystal Microbalance) combination electrode places quartz substrate central authorities, described QCM (Quartz Crystal Microbalance) combination electrode is made up of QCM (Quartz Crystal Microbalance) electrode and film, described film is attached at the QCM (Quartz Crystal Microbalance) electrode surface, described sensing material is dispersed in the film, and described film is a bacteria cellulose film.
A kind of gas sensor of the present invention based on bacteria cellulose, combination electrode wherein refers to adhesion such as the polar molecule generation Van der Waals force that utilizes a large amount of hydroxyl in bacteria cellulose fibre surface and ehter bond and quartz crystal surface and hydrogen bond action power, thereby at QCM (Quartz Crystal Microbalance) electrode surface deposition one deck bacteria cellulose film, its preparation method comprises following implementation step:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and with nitrogen dry up or oven dry or air dry standby.With mass volume ratio is that 1: 1～1: 5 bacteria cellulose and distilled water mix, and at room temperature homogeneous disperses to obtain homodisperse bacteria cellulose aqueous mixtures, such as using hollander or homogenizer with rotating speed 5000-15000r/min making beating 5-20min.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 10-50 μ L step (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), drying obtains combination electrode.
A kind of gas sensor of the present invention based on bacteria cellulose, sensitive membrane wherein refers to drip on above-mentioned combination electrode and is coated with sensing material, utilize a large amount of hydroxyl in bacteria cellulose fibre surface and sensing material to form hydrogen bond action, sensing material is evenly distributed in the bacteria cellulose nanofiber three-dimensional net structure, thereby obtains adhering to the sensitive membrane on the combination electrode.The implementation step of its preparation method is coated onto on the combination electrode for massfraction 0.05-3wt% sensing material water solution 2-200 μ L is dripped, dry 12-24h under 20-30 ℃.
The using method of a kind of gas sensor based on bacteria cellulose of the present invention, implementation step is mainly: the above-mentioned sensor that obtains is placed pick-up unit, by syringe injected gas sample in pick-up unit, after treating the QCM (Quartz Crystal Microbalance) stable reading, read the quality of gas to be detected in the gas sample, and calculate gas concentration to be detected in the gas.
Aforesaid a kind of gas sensor based on bacteria cellulose, described 10-1000mg bacteria cellulose film are that 10-1000mg bacteria cellulose dry film or 10-1000mg bacteria cellulose powder or dry weight are the bacterial cellulose wet-coating of 10-1000mg.
Aforesaid a kind of gas sensor based on bacteria cellulose, the described QCM (Quartz Crystal Microbalance) pole drying method that deposits bacteria cellulose fibre comprise 30-100 ℃ of dry 1-10h or freeze drying 20-30h down.
Aforesaid a kind of gas sensor based on bacteria cellulose, described sensing material are one or more the potpourri in polyethyleneimine, polyvinylamine, polyaniline, poly-diphenylamine, polyortho methylaniline, urea, shitosan, collagen, propionic acid acid amides, triethanolamine, polyacrylamide, polyacrylic acid, polyesteramide, oxalylurea, PDDA, Hydrin, polypropylene-base amine hydrochlorate, the camphorsulfonic acid.
Aforesaid a kind of gas sensor based on bacteria cellulose, described gas to be detected are a kind of in gaseous aldehyde, organic amine gas and the alcohols gases such as ammonia, sulfuretted hydrogen, sulphuric dioxide, sulfuric anhydride, chlorine, formaldehyde.
Beneficial effect
The present invention adopts has the cancellated bacteria cellulose material of 3 D stereo, and it has superhigh specific surface area, by it being deposited on the QCM (Quartz Crystal Microbalance) electrode, can improve the sensitivity of detected gas largely, and detection limit can reach 30ppb.The present invention has that cost is low, highly sensitive, reusable, and long-time stability and selectivity are good, and preparation technology is simple, realizes mass production easily, has solved the deficiency of at present existing gas detection method.
Embodiment
Below in conjunction with embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1:
(1), and dry up standby with nitrogen at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance).
500mg bacteria cellulose dry film is immersed in the 500mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 12000r/min making beating 10min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 25 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 1.0wt% polyethyleneimine: amine aqueous solution 50 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 25 ℃ of dry 24h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 1.2 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 30ppb in the calculating gas.
Embodiment 2:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and dry for standby.With dry weight is in the bacterial cellulose wet-coating immersion 50mL distilled water of 10mg, and at room temperature obtains homodisperse bacteria cellulose aqueous mixtures with hollander with rotating speed 5000r/min making beating 20min.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 50 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 20h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 0.5wt% polyacrylamide solution 25 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 20 ℃ of dry 24h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 2 * 10 of formaldehyde in the gas sample
-3Ng, concentration of hydrogen sulfide is 50ppb in the calculating gas.
Embodiment 3:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and air dry is standby.Dry weight immerses in the 500mL distilled water for the 500mg bacterial cellulose wet-coating, and at room temperature obtains homodisperse bacteria cellulose aqueous mixtures with hollander with rotating speed 12000r/min making beating 8min.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 25 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 0.2wt% polyortho methylaniline aqueous solution 100 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 25 ℃ of dry 12h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 8 * 10 of formaldehyde in the gas sample
-3Ng, concentration of hydrogen sulfide is 200ppb in the calculating gas.
Embodiment 4:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and with nitrogen dry up or oven dry or air dry standby.10mg bacteria cellulose dry film is immersed in the 100mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 5000r/min making beating 20min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 50 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 1.0wt% triethanolamine solution 200 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 25 ℃ of dry 24h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 8 * 10 of sulphuric dioxide in the gas sample
-3Ng, sulfur dioxide concentration is 200ppb in the calculating gas.
Embodiment 5:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and air dry is standby.1000mg bacteria cellulose powder is immersed in the 1000mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 15000r/min making beating 20min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 10 μ L steps (1) is dripped and is coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), 100 ℃ down dry 1h obtain depositing the QCM (Quartz Crystal Microbalance) electrodes of bacteria cellulose fibre.
(3) massfraction 0.1% triethanolamine aqueous solution 2 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 30 ℃ of dry 12h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 4 * 10 of phosgene in the gas sample
-3Ng, phosgene concentration is 100ppb in the calculating gas.
Embodiment 6:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and with nitrogen dry up or oven dry or air dry standby.500mg bacteria cellulose dry film is immersed in the 500mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 12000r/min making beating 10min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 25 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 2.0wt% polyacrylic acid aqueous solution 50 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 25 ℃ of dry 24h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 5.7 * 10 of ammonia in the gas sample
-3Ng, ammonia concentration is 30ppb in the calculating gas.
Embodiment 7:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and air dry is standby.1000mg bacteria cellulose powder is immersed in the 1000mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 15000r/min making beating 20min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 10 μ L steps (1) is dripped and is coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), 100 ℃ down dry 1h obtain depositing the QCM (Quartz Crystal Microbalance) electrodes of bacteria cellulose fibre.
(3) massfraction 0.1% polyaniline aqueous solution 2 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 30 ℃ of dry 12h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 4 * 10 of formaldehyde in the gas sample
-3Ng, monomethyl amine concentration is 100ppb in the calculating gas.
Embodiment 8:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and with nitrogen dry up or oven dry or air dry standby.10mg bacteria cellulose dry film is immersed in the 100mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 5000r/min making beating 20min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 50 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 2.0wt% camphorsulfonic acid aqueous solution 200 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 25 ℃ of dry 24h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 8 * 10 of formaldehyde in the gas sample
-3Ng, first and second determining alcohols are 200ppb in the calculating gas.
Embodiment 9:
(5) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and air dry is standby.1000mg bacteria cellulose powder is immersed in the 1000mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 15000r/min making beating 20min with hollander.
(6) with micro-pipette the bacteria cellulose aqueous mixtures in the 10 μ L steps (1) is dripped and is coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), 100 ℃ down dry 1h obtain depositing the QCM (Quartz Crystal Microbalance) electrodes of bacteria cellulose fibre.
(7) massfraction 0.1% polyaniline aqueous solution 2 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 30 ℃ of dry 12h down.
(8) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 4 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 100ppb in the calculating gas.
Embodiment 10:
(1), and dry up standby with nitrogen at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance).300mg bacteria cellulose dry film is immersed in the 300mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 8000r/min making beating 10min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 15 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 25h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) the poly-diphenylamine aqueous solution 100 μ L of massfraction 0.2wt% are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 25 ℃ of dry 20h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 8 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 200ppb in the calculating gas.
Embodiment 11:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and dry for standby.Dry weight is immersed in the 800mL distilled water for the 800mg bacterial cellulose wet-coating, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 14000r/min making beating 16min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 10 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 30h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) the water-soluble drop of massfraction 0.05wt% polyesteramide 200 μ L is coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre dry 18h under 20 ℃.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 12 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 300ppb in the calculating gas.
Embodiment 12:
(1), and dry up standby with nitrogen at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance).200mg bacteria cellulose dry film is immersed in the 500mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 10000r/min making beating 15min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 25 μ L steps (1) is dripped and is coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), 30 ℃ down dry 10h obtain depositing the QCM (Quartz Crystal Microbalance) electrodes of bacteria cellulose fibre.
(3) massfraction 1.5wt% propionic acid amide aqueous solution 100 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 30 ℃ of dry 6h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 32 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 800ppb in the calculating gas.
Embodiment 13:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and dry for standby.Dry weight is immersed in the 500mL distilled water for the 200mg bacterial cellulose wet-coating, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 10000r/min making beating 10min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 30 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 3wt% aqueous solution of urea 10 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 30 ℃ of dry 6h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 16 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 400ppb in the calculating gas.
Embodiment 14:
(1), and dry up standby with nitrogen at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance).Dry weight is immersed in the 300mL distilled water for the 100mg bacterial cellulose wet-coating, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 8000r/min making beating 10min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 25 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 30h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 3wt% oxalylurea aqueous solution 50 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 20 ℃ of dry 24h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 20 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 500ppb in the calculating gas.
Embodiment 15:
(1), and dry up standby with nitrogen at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance).
500mg bacteria cellulose powder is immersed in the 500mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 15000r/min making beating 5min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 10 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 1.5wt% triethanolamine aqueous solution 50 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 25 ℃ of dry 24h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 8 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 200ppb in the calculating gas.
Embodiment 16:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and with nitrogen dry up or oven dry or air dry standby.Dry weight is immersed in the 500mL distilled water for the 500mg bacterial cellulose wet-coating, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 12000r/min making beating 10min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 20 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 2.0wt% collagenic aqueous solution 100 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 30 ℃ of dry 10h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 40 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 1ppm in the calculating gas.
Embodiment 17:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and with nitrogen dry up or oven dry or air dry standby.Dry weight is immersed in the 500mL distilled water for the 50mg bacterial cellulose wet-coating, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 8000r/min making beating 20min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 50 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 0.1wt% chitosan aqueous solution 100 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 25 ℃ of dry 24h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 40 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 1ppm in the calculating gas.
Embodiment 18:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and with nitrogen dry up or oven dry or air dry standby.Dry weight is immersed in the 1000mL distilled water for the 300mg bacterial cellulose wet-coating, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 8000r/min making beating 15min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 25 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 2.0wt% PDDA aqueous solution 50 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 20 ℃ of dry 24h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 2.4 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 60ppb in the calculating gas.
Embodiment 19:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and with nitrogen dry up or oven dry or air dry standby.Dry weight is immersed in the 500mL distilled water for the 500mg bacterial cellulose wet-coating, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 10000r/min making beating 10min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 30 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 1.5wt% polypropylene-base amine hydrochlorate aqueous solution 50 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 30 ℃ of dry 12h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 3.2 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 80ppb in the calculating gas.
Embodiment 20:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and with nitrogen dry up or oven dry or air dry standby.10mg bacteria cellulose dry film is immersed in the 100mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 5000r/min making beating 20min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 50 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 2.0wt% polyortho methylaniline aqueous solution 200 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 25 ℃ of dry 24h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 8 * 10 of formaldehyde in the gas sample
-3Ng, concentration of formaldehyde is 200ppb in the calculating gas.
Embodiment 21:
(1) at room temperature respectively with the electrode of ethanol and washed with de-ionized water QCM (Quartz Crystal Microbalance), and with nitrogen dry up or oven dry or air dry standby.10mg bacteria cellulose dry film is immersed in the 100mL distilled water, and at room temperature obtain homodisperse bacteria cellulose aqueous mixtures with rotating speed 5000r/min making beating 20min with hollander.
(2) with micro-pipette the bacteria cellulose aqueous mixtures in the 50 μ L steps (1) is dripped and be coated with the electrode surface that is dispersed in QCM (Quartz Crystal Microbalance), freeze drying 24h obtains depositing the QCM (Quartz Crystal Microbalance) electrode of bacteria cellulose fibre.
(3) massfraction 2.0wt% Hydrin aqueous solution 200 μ L are dripped be coated onto on the QCM (Quartz Crystal Microbalance) electrode that deposits bacteria cellulose fibre, in 25 ℃ of dry 24h down.
(4) combination electrode that obtains is placed pick-up unit, by syringe injected gas sample 0.4 μ L in pick-up unit, treat the QCM (Quartz Crystal Microbalance) stable reading after, read the quality 8 * 10 of formaldehyde in the gas sample
-3Ng, methanol concentration is 200ppb in the calculating gas.
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| CN103032790A (en) * | 2012-12-27 | 2013-04-10 | 苏州久三智能科技有限公司 | Ceiling lamp capable of detecting air quality |
| CN103033538A (en) * | 2012-12-20 | 2013-04-10 | 中国科学院微电子研究所 | Preparation method of sensitive film based on flexible substrate for detecting gas at normal temperature |
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| CN103033538A (en) * | 2012-12-20 | 2013-04-10 | 中国科学院微电子研究所 | Preparation method of sensitive film based on flexible substrate for detecting gas at normal temperature |
| CN103033538B (en) * | 2012-12-20 | 2015-01-21 | 中国科学院微电子研究所 | Preparation method of sensitive film based on flexible substrate for detecting gas at normal temperature |
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| CN104181068A (en) * | 2014-07-21 | 2014-12-03 | 中国科学院理化技术研究所 | Copper oxide modified quartz crystal microbalance sensor with opposite response signals to hydrogen cyanide gas and water vapor |
| CN107498939A (en) * | 2017-07-10 | 2017-12-22 | 东华大学 | Ventilative high-elastic type single electrode friction nanometer power generator of one kind and preparation method thereof |
| CN107970478A (en) * | 2017-11-11 | 2018-05-01 | 丁玉琴 | A kind of solid air freshening agent |
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| CN114166681A (en) * | 2021-11-12 | 2022-03-11 | 常州大学 | QCM humidity sensor based on high polymer/inorganic composite sensitive material and preparation method thereof |
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| CN119985688A (en) * | 2025-04-16 | 2025-05-13 | 西北农林科技大学 | CO (carbon monoxide)2Gas sensor and preparation method thereof |
| CN119985688B (en) * | 2025-04-16 | 2025-06-20 | 西北农林科技大学 | CO (carbon monoxide)2Gas sensor and preparation method thereof |
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