CN104568809A - Intermediate infrared molecular vibration spectrum sensing method based on graphene array structure - Google Patents
Intermediate infrared molecular vibration spectrum sensing method based on graphene array structure Download PDFInfo
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- CN104568809A CN104568809A CN201510053031.8A CN201510053031A CN104568809A CN 104568809 A CN104568809 A CN 104568809A CN 201510053031 A CN201510053031 A CN 201510053031A CN 104568809 A CN104568809 A CN 104568809A
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Abstract
The invention belongs to the technical field of detection, and particularly relates to an intermediate infrared molecular vibration spectrum sensing method based on a graphene array structure. The intermediate infrared molecular vibration spectrum sensing method comprises the following steps of: A. providing an intermediate infrared frequency band field and substance interactive graphene array structure, wherein the graphene array structure is formed by adhering a graphene period array to a substrate dielectric layer and vertically irradiated by intermediate infrared parallel wave beams; B1. coating a layer of samples to be detected on the graphene array structure for the detection of a liquid chemical substance; B2. placing the graphene array structure into a closed cavity for the detection of a gaseous chemical substance, and introducing a gas to be detected; C. transforming a wavelength-adjustable intermediate infrared light source into parallel wave beams through a lens, vertically irradiating to excite the graphene array structure, and detecting by adopting a detection array to obtain a transmission spectrum which represents the molecular vibration characteristics of the samples to be detected so as to obtain a molecular vibration spectrum. The intermediate infrared molecular vibration spectrum sensing method disclosed by the invention is favorable for developing a simple real-time molecular vibration spectrum measuring instrument.
Description
Technical field
The invention belongs to detection technique field, be specifically related to a kind of based on molecular vibration spectrum method for sensing infrared in graphene array structure.
Background technology
In infrared molecular vibration spectrum be widely used in the mensuration of molecular structure of compounds, Identification and blending constituent analysis, be the important parameter of sensing recognition material character and feature, be also referred to as molecular vibration fingerprint.At present, adopt infrared spectrometer can obtain molecular vibration spectrum, but infrared spectrometer is complicated, expensive.
Summary of the invention
, expensive problem complicated for infrared spectrometer, the invention provides a kind of cost low and easy to implement based on molecular vibration spectrum method for sensing infrared in graphene array structure.
Technical scheme of the present invention is achieved in that a kind of based on molecular vibration spectrum method for sensing infrared in graphene array structure, comprises the following steps:
A. the graphene array structure of infrared frequency range field and matter interaction in providing, is attached on base dielectric layer by Graphene periodic array and forms, by infrared parallel beam vertical irradiation;
B1. for the detection of liquid chemical, graphene array structure covers one deck testing sample;
B2. for the detection of gaseous chemical substance, graphene array structure is positioned in a closed cavity, passes into gas to be measured;
C. the mid-infrared light source scioptics of Wavelength tunable are transformed to parallel beam, and vertical irradiation excitation graphene array structure, adopts detection arrays to detect, obtain the transmission spectrum characterizing testing sample molecular vibration feature, obtain molecular vibration spectrum with this.
Further, in steps A, by the transmission spectrum regulating the graphene array structural transmission coefficient described in chemical potential to have broadband, cover specific testing sample in molecular vibration spectrum in infrared band limits, and with in infrared frequency range molecular vibration form coupled resonance and strengthen.The reason of Graphene is adopted to be in infrared and Terahertz frequency range, the specific inductive capacity of Graphene is negative value, surface plasma resonant vibration mould can be formed, and by regulating the change resonance frequency that chemical potential can be level and smooth, thus the interaction of selectively enhanced field and material; Object graphene ribbon being arranged as array structure strengthens transmission.
Further, in step B2, described closed cavity not electromagnetic wave absorption, is made up of electromagnetic wave transparent materials such as quartz, plays the effect of confining gas, but do not affect electromagnetic transmission.
The present invention utilizes and is attached to the testing sample of graphene array structure and local fields interacts, cause graphene array structure wideband transmit to compose to compose with testing sample molecular vibration and form coupled resonance and strengthen, thus realize the detection of molecular vibration spectrum, be conducive to developing simple and easy, real-time molecular vibration spectrometry instrument.
Accompanying drawing explanation
Fig. 1 is detection model schematic diagram;
Fig. 2 is detection model xsect;
Fig. 3 is the relation of Graphene specific inductive capacity and wavelength;
Fig. 4 is infrared frequency range acetic anhydride fluid molecule vibrational spectra in being;
Fig. 5 is the measurement result obtained in the situation Imitating detection arrays covered with/without sample;
Fig. 6 is the impact of sample cladding thickness on testing result.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Based on a molecular vibration spectrum method for sensing infrared in graphene array structure, comprise the following steps:
A. the graphene array structure of infrared frequency range field and matter interaction in providing, as depicted in figs. 1 and 2, is attached on base dielectric layer 2 by Graphene periodic array 1 and forms, by infrared parallel beam vertical irradiation; Base material is silicon dioxide, and refractive index is n=1.45; Graphene ribbon thickness is t=1nm, width w=0.25 μm, period p=0.5 μm; The specific inductive capacity of graphene ribbon is ε=1+i σ/ε
0ω t, wherein σ=σ
intra+ σ
interfor conductivity, σ
intraand σ
interinterband and the contribution in band respectively; According to Kubo formula:
In formula, T is temperature, Γ carrier mobility, and μ is chemical potential,
for Planck's constant; Getting temperature is room temperature, arranges T=300 × k
b, k
bfor Boltzmann constant, Γ=0.1meV, μ=0.3eV, obtains the relation of Graphene specific inductive capacity and frequency as shown in Figure 3.Can find out, in infrared 3-50 μm, its real part of permittivity is negative, and imaginary part (loss) is less.
B1. for the detection of liquid chemical, testing sample 3 is acetic anhydride liquid, be covered in graphene array structure, overlay capacity is represented with thickness, get thickness h=1 μm, in infrared frequency range acetic anhydride molecular absorption coefficient and frequency relation as shown in Figure 4, come from molecular vibration, be also referred to as molecular vibration spectrum;
B2. for the detection of gaseous chemical substance, graphene array structure is positioned in a closed cavity 4, passes into gas to be measured, described closed cavity 4 not electromagnetic wave absorption;
C. as shown in Figure 2, parallel beam is transformed to the mid-infrared light source scioptics 5 of Wavelength tunable, vertical irradiation excitation graphene array structure, the wavelength coverage of driving source is 8-11 μm, detection arrays 6 is adopted to detect, obtain the transmission spectrum characterizing testing sample molecular vibration feature, obtain molecular vibration spectrum with this.
The present embodiment adopts Finite-Difference Time-Domain Method software Lumerical FDTD to carry out modeling and simulation, when not covering acetic anhydride fluid sample, the transmission coefficient that detection arrays measures is as shown in solid line in Fig. 5, can find out, transmission coefficient is a nearly level and smooth straight line, cover the vibrational spectra scope of infrared frequency range molecule in acetic anhydride, and its value levels off to 1, indicate this structure transparent to incident wave beam.When covering acetic anhydride fluid sample, as shown in phantom in Figure 5, comparison diagram 4 can obtain the transmission coefficient that detection arrays measures, and the variation tendency of transmission coefficient is composed consistent with molecular vibration, reaches the object of detection molecules vibrational spectra.When the thickness of acetic anhydride sample to be measured gets different value, detect the transmission coefficient obtained and see as shown in Figure 6.Can find out, thickness is larger, then transmission attenuation is larger, more be beneficial to detection, and do not affect the shape of transmission coefficient envelope owing to increasing thickness, therefore, robustness of the present invention is good, is not vulnerable to extraneous enchancement factor, as the filling thickness of sample and the impact of unevenness.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1., based on a molecular vibration spectrum method for sensing infrared in graphene array structure, it is characterized in that comprising the following steps:
A. the graphene array structure of infrared frequency range field and matter interaction in providing, is attached on base dielectric layer (2) by Graphene periodic array (1) and forms, by infrared parallel beam vertical irradiation;
B1. for the detection of liquid chemical, graphene array structure covers one deck testing sample (3);
B2. for the detection of gaseous chemical substance, graphene array structure is positioned in a closed cavity (4), passes into gas to be measured;
C. the mid-infrared light source scioptics (5) of Wavelength tunable are transformed to parallel beam, vertical irradiation excitation graphene array structure, adopt detection arrays (6) to detect, obtain the transmission spectrum characterizing testing sample molecular vibration feature, obtain molecular vibration spectrum with this.
2. as claimed in claim 1 based on molecular vibration spectrum method for sensing infrared in graphene array, it is characterized in that: in described steps A, described graphene array structural transmission coefficient is made to have the transmission spectrum in broadband by regulating chemical potential, cover specific testing sample in molecular vibration spectrum in infrared band limits, and with in infrared frequency range molecular vibration form coupled resonance and strengthen.
3., as claimed in claim 1 based on the molecular vibration spectrum method for sensing of graphene array, it is characterized in that: in described step B2, described closed cavity (4) not electromagnetic wave absorption.
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| US20130193404A1 (en) * | 2012-01-26 | 2013-08-01 | Consejo Superior De Investigaciones Cientificas | Photoconversion device with enhanced photon absorption |
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| CN103674880A (en) * | 2013-10-25 | 2014-03-26 | 中国科学院上海光学精密机械研究所 | TM (transverse magnetic) polarization graphene nanobelt array sensor |
| CN103776790A (en) * | 2014-02-25 | 2014-05-07 | 重庆大学 | Infrared spectrum enhancement and detection method and infrared spectrum enhancement and detection device based on graphene nano antenna |
| CN104317118A (en) * | 2014-10-24 | 2015-01-28 | 华中科技大学 | Graphene-based electric-control liquid crystal light-converging micro-lens array chip |
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2015
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| US20110006837A1 (en) * | 2009-06-02 | 2011-01-13 | Feng Wang | Graphene Device, Method of Investigating Graphene, and Method of Operating Graphene Device |
| US20130193404A1 (en) * | 2012-01-26 | 2013-08-01 | Consejo Superior De Investigaciones Cientificas | Photoconversion device with enhanced photon absorption |
| CN103674880A (en) * | 2013-10-25 | 2014-03-26 | 中国科学院上海光学精密机械研究所 | TM (transverse magnetic) polarization graphene nanobelt array sensor |
| CN103633183A (en) * | 2013-11-18 | 2014-03-12 | 西安电子科技大学 | Graphene medium-far infrared detector and preparing method thereof |
| CN103776790A (en) * | 2014-02-25 | 2014-05-07 | 重庆大学 | Infrared spectrum enhancement and detection method and infrared spectrum enhancement and detection device based on graphene nano antenna |
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| B. VASIC´ ET AL.: "Localized surface plasmon resonances in graphene ribbon arrays for sensing of dielectric environment at infrared frequencies", 《JOURNAL OF APPLIED PHYSICS》 * |
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