Breathing ammonia gas sensor based on polyaniline/semiconductor metal oxide nano composite film and preparation method thereof

An ammonia gas sensor and nanocomposite technology, which is applied to instruments, scientific instruments, measuring devices, etc., can solve the problems of selectivity, sensitivity and moisture resistance, insufficient breath detection, etc., and achieve good selectivity, low cost, and low detection limit. Effect

Pending Publication Date: 2019-08-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem that the breath ammonia sensor in the prior art is difficult to be applied to actual breath detection due to the lack of selectivity, sensitivity,

Method used

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  • Breathing ammonia gas sensor based on polyaniline/semiconductor metal oxide nano composite film and preparation method thereof
  • Breathing ammonia gas sensor based on polyaniline/semiconductor metal oxide nano composite film and preparation method thereof
  • Breathing ammonia gas sensor based on polyaniline/semiconductor metal oxide nano composite film and preparation method thereof

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no. 1 approach

[0045] In the first embodiment of the present invention, a breath ammonia sensor based on polyaniline / semiconductor metal oxide nanocomposite film is provided.

[0046] The breath ammonia sensor includes a polyaniline / metal germanate nanocomposite film, and the polyaniline / metal germanate nanocomposite film is a film formed by doping polyaniline with metal germanate, or the polyaniline / metal germanate The germanate nanocomposite film comprises a metal germanate film and a polyaniline film attached to the metal germanate film. in particular:

[0047] In a possible implementation manner, the polyaniline / metal germanate nanocomposite film has the same content of polyaniline and metal germanate components, and the two are evenly doped together. In another possible implementation, the polyaniline / metal germanate nanocomposite film is a layered film, including a metal germanate film and a polyaniline film attached to the metal germanate film, so The metal germanate film and the po...

no. 2 approach

[0055] In the second embodiment of the present invention, a method for preparing a breath ammonia sensor based on polyaniline / semiconductor metal oxide nanocomposite film is provided. in particular:

[0056] For the film formed by metal germanate doped polyaniline, the preparation method (A) comprises the following steps:

[0057] (1) cleaning the substrate, vapor-depositing the interdigitated electrodes to obtain the substrate device;

[0058] (2) Prepare metal germanate dispersion liquid, aniline monomer dispersion liquid, oxidant dispersion liquid;

[0059] (3) mixing the metal germanate dispersion liquid and the aniline monomer dispersion liquid uniformly, and introducing the oxidizing agent dispersion liquid for in-situ polymerization to obtain polyaniline / metal germanate nanocomposite materials;

[0060] (4) Depositing a thin film on the polyaniline / metal germanate nanocomposite material obtained in step (3) by using a film forming process.

[0061] Wherein, in step (...

Embodiment 1

[0081] The substrate device selected in this embodiment is a flexible polyimide substrate, and gold interdigitated electrodes grown thereon; the interdigitated electrodes have an interdigital width of 180 μm, an interdigital spacing of 180 μm, and an electrode thickness of 120 nm. ; The germanate used in this embodiment is strontium germanate nanowires; the film-forming method used in this embodiment is a self-assembly method.

[0082] (1) Cut polyimide with a thickness of 100 μm into a size of 0.8*0.7cm; then wash the substrate in deionized water, acetone, deionized water, alcohol, and deionized water for 40 minutes, and then dry it in an oven; A gold interdigitated electrode with a thickness of 120 nm was evaporated on the polyimide substrate by using an evaporation apparatus.

[0083] (2) Soak the base device obtained in step (1) in PDDA (5 mg / mL) and PSS (0.1 wt%) solutions in deionized water for 15 min in sequence.

[0084] (3) Preparation of aniline monomer dispersion: ...

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Abstract

The invention provides a breathing ammonia gas sensor based on a polyaniline/semiconductor metal oxide nano composite film. The breathing ammonia gas sensor based on the polyaniline/semiconductor metal oxide nano composite film comprises a polyaniline/metal germanate nanocomposite film, wherein the polyaniline/metal germanate nanocomposite film is a film formed by doping polyaniline with metal germanate, or the polyaniline/metal germanate nanocomposite film comprises a metal germanate film and a polyaniline film attached to the metal germanate film. The breathing ammonia gas sensor based on the polyaniline/semiconductor metal oxide nano composite film has excellent performances such as selectivity, sensitivity, repeatability, stability and response recovery time, and shows good discrimination in actual measurement of human breathing ammonia gas concentration. The breathing ammonia gas sensor based on the polyaniline/semiconductor metal oxide nano composite film has simple preparation process, low cost and suitability for mass production.

Description

technical field [0001] The invention belongs to the technical field of resistive thin-film gas sensors and the technical field of organic / inorganic composite nanomaterials, and specifically relates to a breath ammonia sensor based on polyaniline / semiconductor metal oxide nanocomposite films and a preparation method thereof. Background technique [0002] Medical research reports show that the human body will produce ammonia during the metabolic process, and the increase in the concentration of ammonia in the exhaled breath is usually related to kidney disease. The average concentration of ammonia gas is 4.88ppm, which is 5 times the concentration of ammonia gas exhaled by normal people. Therefore, the preliminary diagnosis of diseases can be realized by detecting the concentration of ammonia gas exhaled by the human body. Respiratory diagnosis, as a new type of disease diagnosis technology, has attracted widespread attention due to its characteristics of no harm to patients a...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/126G01N27/127
Inventor 太惠玲张俊新杨瑞雨王斯段再华刘勃豪蒋亚东谢光忠
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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