CN114122183B - Integrated flexible filter paper-based calcium niobate ultraviolet detector and preparation method and application thereof - Google Patents

Abstract

The invention discloses an integrated flexible filter paper-based calcium niobate ultraviolet detector and a preparation method thereof, comprising the following steps: (a) preparing a two-dimensional perovskite type calcium niobate nano sheet. (b) And (3) filtering the calcium niobate nanosheet solution to obtain the filter paper calcium niobate composite membrane. (c) And placing the filter paper calcium niobate composite membrane in a dryer overnight, and then removing a layer of calcium niobate film on the surface to obtain the integrated filter paper calcium niobate. (d) And constructing an integrated flexible filter paper calcium niobate ultraviolet detector, and testing the flexibility and photoelectric property of the device. The invention discloses an integrated flexible filter paper calcium niobate ultraviolet detector and a preparation method thereof for the first time, the experimental method is simple and low in cost, and the filter paper calcium niobate ultraviolet detector has excellent photoelectric performance under multiple bending, so that the application of two-dimensional materials and related nano structures and filter papers in the field of constructing flexible photoelectric devices is greatly expanded.

Description

Integrated flexible filter paper-based calcium niobate UV detector and its preparation method and use

Technical field

The invention belongs to the technical field of flexible photoelectric detectors, and more specifically relates to an integrated flexible filter paper calcium niobate ultraviolet detector and a preparation method thereof.

Background technique

The current development of highly intelligent and integrated devices has made tremendous progress, and science and technology are expected to be used in daily life in different forms of wearable devices. Among them, photodetectors convert light into other signals and are widely used in ozone sensing, flame detection, medical imaging, memristors, astronomical detection and other fields. Applying such devices to wearable devices, using photoelectric detection principles to meet practical requirements, also provides opportunities for intelligent monitoring. Two approaches are generally adopted to implement wearable/flexible photodetectors. aSelect inherently flexible materials such as polymers, paper, fibers and ultra-thin semiconductor layers. b Modification of materials to form flexible structures or increase the flexibility of materials, such as wrinkles and spiral structures. However, current construction methods for flexible photodetectors are usually implemented through flexible substrates. We need to continue to explore suitable materials, design novel structures, and efficient manufacturing methods.

KCa ₂ Nb ₃ O ₁₀ is an n-type semiconductor with a layered perovskite structure, which consists of negatively charged NbO ₆ sheets, with two adjacent layers separated by a layer of K+ ions. Of particular interest are two-dimensional perovskite calcium niobate (Ca ₂ Nb ₃ O ₁₀ ) nanosheets that undergo solid-phase reaction-protonation-liquid phase exfoliation. These Ca ₂ Nb ₃ O ₁₀ nanosheets have proven to be an excellent material and are widely used in fields such as dielectrics, ferroelectrics, thermocatalysis, and water splitting. However, so far, there is no published, simple, and practically applicable method to realize the application of flexible Ca ₂ Nb ₃ O ₁₀ nanosheet photodetection technology. Therefore, it is of great significance to explore a flexible and efficient photodetector technology based on Ca ₂ Nb ₃ O ₁₀ nanosheets.

Contents of the invention

In order to obtain an integrated flexible wearable Ca ₂ Nb ₃ O ₁₀ nanosheet UV detector, the present invention designed a Ca ₂ Nb ₃ O ₁₀ nanosheet with flexible filter paper as a carrier, which has its own bending characteristics and is perfectly combined with the filter paper holes. Together, we realize an integrated flexible filter paper Ca ₂ Nb ₃ O ₁₀ nanosheet UV detector. The preparation process of the invention is simple, the cost is low, and the device has good flexible optoelectronic properties, and provides a new method for constructing integrated flexible optoelectronic devices.

In order to achieve the above-mentioned invention and creation purpose, the present invention adopts the following technical solution: an integrated flexible filter paper-based calcium niobate ultraviolet detector, which is filled with two-dimensional perovskite calcium niobate nanosheets in the filter paper holes to form an integrated filter paper niobium Calcium niobate is formed by evaporating electrodes on the surface of integrated filter paper calcium niobate.

Preferably, the filter paper is a conventional commercial general-purpose filter paper.

According to the second aspect of the present invention, the preparation method of the integrated flexible filter paper-based calcium niobate ultraviolet detector includes the following steps:

(a) Preparing an aqueous solution of two-dimensional perovskite calcium niobate nanosheets;

(b) Using filter paper as a filter membrane, filter the calcium niobate nanosheet solution through suction filtration to obtain a filter paper calcium niobate composite membrane;

(c) Place the filter paper calcium niobate composite membrane in a desiccator overnight, and then peel off a layer of calcium niobate film on the surface to obtain an integrated filter paper calcium niobate;

(d) Construct an integrated filter paper calcium niobate UV detector and test the flexible optoelectronic properties of the device.

Preferably, the two-dimensional perovskite calcium niobate nanosheets in step (a) are prepared by a solid-phase reaction-protonation-liquid phase exfoliation method, and are placed in deionized water to obtain calcium niobate nanosheets. tablet solution. The obtained two-dimensional perovskite calcium niobate nanosheets have a large area, high quality, and present single-layer or few-layer two-dimensional perovskite Ca ₂ Nb ₃ O ₁₀ nanosheets.

Preferably, obtaining the filter paper calcium niobate composite membrane by suction filtration in step (b) means passing the water in the aqueous solution of the two-dimensional perovskite calcium niobate nanosheets through the filter paper under normal pressure or pressurized conditions. Dimensional perovskite calcium niobate nanosheets are filled in the filter paper holes to form integrated filter paper calcium niobate.

Preferably, in step (c), the filter paper calcium niobate composite membrane is placed in a desiccator overnight, and then a layer of calcium niobate film on the surface is peeled off to obtain an integrated filter paper calcium niobate.

Preferably, constructing the integrated filter paper calcium niobate UV detector in step (d) means constructing a photoelectric detector by evaporating electrodes on the surface of the integrated filter paper calcium niobate through a hard mask. Through testing, the device has excellent flexible UV Optoelectronic properties.

According to another aspect of the present invention, the integrated filter paper calcium niobate UV detector prepared by the present invention is used in flexible wearable optoelectronic devices.

This invention realizes for the first time an integrated filter paper calcium niobate UV detector that has both good flexibility and excellent photoelectric properties. The preparation method is simple, low-cost and universal. The present invention has outstanding advantages:

1. The integrated filter paper calcium niobate UV detector prepared by the present invention has low cost, simple method and universal applicability.

2. For the first time, the integration of flexible substrates and flexible materials has been achieved, which will have important promotion and application value in flexible wearable electronic devices.

Description of drawings

Figure 1 is a characterization diagram of the two-dimensional calcium niobate nanosheets prepared in Example 1, where a is a scanning electron microscope image (SEM image); b is an atomic force microscope photo image;

Figure 2 is a diagram of the filter paper calcium niobate composite membrane after suction filtration in the embodiment. a is the filter paper calcium niobate composite membrane obtained by peeling off the calcium niobate film and the integrated filter paper calcium niobate. b is the low density of the integrated filter paper calcium niobate. SEM image, c is a high-magnification SEM image of integrated filter paper calcium niobate;

Figure 3 is a test chart of the calcium niobate flexibility of the integrated filter paper according to the embodiment;

Figure 4 is a flexible photoelectric performance diagram of the integrated filter paper calcium niobate ultraviolet detector according to the embodiment, where a is the I-V diagram under flat and bent conditions, b is the I-T diagram under flat and bent conditions, and c is the I-T diagram under different bending times. picture.

Detailed ways

Example 1

(a) Obtain single-layer or few-layer perovskite Ca ₂ Nb ₃ O ₁₀ nanosheets through solid-phase reaction-protonation-liquid phase exfoliation method, and place them in deionized water to obtain Ca ₂ Nb ₃ O ₁₀ Nanosheet solution, where Figure 1 shows two-dimensional perovskite calcium niobate nanosheets.

The results in a in Figure 1 show that larger-sized, relatively uniform Ca ₂ Nb ₃ O ₁₀ nanosheets are obtained, and the results in b show that single-layer or few-layer Ca ₂ Nb ₃ O ₁₀ nanosheets are obtained.

(b) The filter paper calcium niobate composite membrane is obtained by simple suction filtration of the Ca ₂ Nb ₃ O ₁₀ nanosheet solution.

(c) Place the filter paper calcium niobate composite membrane in a desiccator overnight, and then peel off a layer of calcium niobate film on the surface to obtain an integrated filter paper calcium niobate, as shown in Figure 2.

After peeling off the surface layer of calcium niobate nanosheet film, the integrated filter paper calcium niobate film can be obtained. From the SEM image, you can see that the calcium niobate nanosheet and filter paper are integrated into one.

(d) Build an integrated filter paper calcium niobate UV detector by evaporating electrodes on the filter paper base surface through a hard mask, and test the photoelectric performance of the device in a flexible state (Figure 3, the photoelectric test test is a semiconductor characterization system (Keithley4200) , the results show that the device has excellent flexible optoelectronic properties, as shown in Figure 4. That is, the device has a high photocurrent of 1.5nA, a large light-on ratio of 200, and still maintains its good optoelectronic properties after being bent 100 times.

Figure 3 shows that we successfully prepared an integrated filter paper calcium niobate film for the first time, and Figure 4 shows that the integrated filter paper film has good flexibility and bendability. This will have great application prospects in future wearable flexible electronic information devices.

Example 2

(a) Obtain single-layer or few-layer perovskite strontium niobate (Sr ₂ Nb ₃ O ₁₀ ) nanosheets through solid-state reaction-protonation-liquid phase exfoliation method, and place them in deionized water to obtain Sr ₂ Nb ₃ O ₁₀ nanosheet solution.

(b) The Sr ₂ Nb ₃ O ₁₀ nanosheet solution is filtered to obtain a filter paper strontium niobate composite membrane.

(c) Place the filter paper strontium niobate composite membrane in a desiccator overnight, and then peel off a layer of strontium niobate film on the surface to obtain an integrated filter paper strontium niobate.

(d) An integrated filter paper strontium niobate UV detector was constructed by evaporating electrodes on the surface of the integrated filter paper strontium niobate through a hard mask, and the photoelectric performance of the device in a flexible state was tested. The results showed that the device has excellent flexible photoelectric properties. performance.

Claims (5)

1. An integrated flexible filter paper-based calcium niobate UV detector, which is filled with two-dimensional perovskite calcium niobate nanosheets in the filter paper holes to form integrated filter paper calcium niobate, and finally evaporates on the surface of the integrated filter paper calcium niobate Made of electrode plating; The preparation method of the integrated flexible filter paper-based calcium niobate ultraviolet detector includes the following steps: (a) Prepare an aqueous solution of two-dimensional perovskite calcium niobate nanosheets. The two-dimensional perovskite calcium niobate nanosheets are Ca ₂ Nb ₃ O ₁₀ nanosheets; (b) Using filter paper as a filter membrane, filter the aqueous solution of two-dimensional perovskite calcium niobate nanosheets through suction filtration to obtain a filter paper calcium niobate composite membrane; (c) Place the filter paper calcium niobate composite membrane in a desiccator overnight, and then peel off a layer of calcium niobate film on the surface to obtain an integrated filter paper calcium niobate; (d) Construct an integrated flexible filter paper-based calcium niobate UV detector, and test the flexible photoelectric performance of the integrated flexible filter paper-based calcium niobate UV detector. 2. The integrated flexible filter paper-based calcium niobate ultraviolet detector according to claim 1, characterized in that: the two-dimensional perovskite calcium niobate nanosheets in step (a) pass through solid-phase reaction-protonation- Prepared by liquid phase exfoliation method. 3. The integrated flexible filter paper-based calcium niobate ultraviolet detector according to claim 1, characterized in that: obtaining the filter paper calcium niobate composite membrane through suction filtration in step (b) means under normal pressure or pressurization. Under the conditions, water in the aqueous solution of two-dimensional perovskite calcium niobate nanosheets is allowed to pass through the filter paper, and the two-dimensional perovskite calcium niobate nanosheets fill the holes of the filter paper to form a filter paper calcium niobate composite membrane. 4. The integrated flexible filter paper-based calcium niobate ultraviolet detector according to claim 1, characterized in that: in step (d), constructing an integrated flexible filter paper-based calcium niobate ultraviolet detector means to use a hard mask to Integrated filter paper calcium niobate surface evaporated electrodes construct an integrated flexible filter paper-based calcium niobate UV detector. 5. Use of the integrated flexible filter paper-based calcium niobate ultraviolet detector as claimed in claim 1 for the preparation of wearable electronic devices.