Nitrogen dioxide sensor based on blocking effect of composite material, and preparation method thereof

A blocking effect, composite material technology, applied in the direction of material resistance, etc., can solve problems such as high power consumption and poor gas sensor performance

Active Publication Date: 2021-05-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a nitrogen dioxide sensor based on the blocking effect of composite materials and a preparation method thereof to solve the problems of poor performance and high power consumption of gas sensors at room temperature in the prior art

Method used

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  • Nitrogen dioxide sensor based on blocking effect of composite material, and preparation method thereof
  • Nitrogen dioxide sensor based on blocking effect of composite material, and preparation method thereof
  • Nitrogen dioxide sensor based on blocking effect of composite material, and preparation method thereof

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Embodiment 1

[0034] The sensitive device selected in this embodiment is a flexible interdigital electrode, and the interdigital electrode is a gold electrode made on a flexible polyimide (PI) substrate. The interdigital spacing of the interdigital electrode is 200 μm, and the interdigital width of the interdigital electrode The electrode thickness of the interdigitated electrode is 200 μm, and the electrode thickness of the interdigitated electrode is 100 nm; in this embodiment, the γ-polyglutamic acid / Ti2C3Tx composite material is selected as the gas sensitive material, and the composite thin film sensitive layer is prepared by a drop coating process, and its specific process steps are:

[0035] (1) Pretreatment of PI substrate gold interdigitated electrodes, cleaning with deionized water, acetone, alcohol and deionized water; dry for later use;

[0036] (2) Prepare the γ-polyglutamic acid dispersion, the solvent is deionized water, configure the γ-polyglutamic acid dispersion with a conce...

Embodiment 2

[0041] The sensitive device selected in this embodiment is a flexible interdigital electrode, and the interdigital electrode is a gold electrode made on a flexible polyimide (PI) substrate. The interdigital spacing of the interdigital electrode is 200 μm, and the interdigital width of the interdigital electrode is 200 μm, and the electrode thickness of interdigitated electrode is 100nm; Select gamma-polyglutamic acid / multi-walled carbon nanotube (MWCNTs) composite material as gas-sensitive material in the present embodiment, adopt spraying process to prepare composite film sensitive layer, its concrete The process steps are:

[0042] (1) Pretreatment of PI substrate gold interdigitated electrodes, cleaning with deionized water, acetone, alcohol and deionized water; dry for later use;

[0043] (2) Prepare the γ-polyglutamic acid dispersion, the solvent is deionized water, configure the γ-polyglutamic acid dispersion with a concentration of 1 mg / mL, and use it for later use afte...

Embodiment 3

[0048] In this embodiment, the sensitive device is a flexible interdigital electrode, and the interdigital electrode is a nickel-chromium-gold electrode on a flexible PET substrate. The interdigital spacing of the interdigital electrode is 50 μm, the interdigital width is 50 μm, and the electrode thickness is 100 nm; In this example, the γ-polyglutamic acid / carbon nanofiber composite material is selected as the gas-sensitive material, and the composite film sensitive layer is prepared by a drop coating process, and the specific process steps are as follows:

[0049] (1) Pre-treat the nickel-chromium-gold interdigitated electrode on the PET substrate, wash it with ionized water, acetone, alcohol and deionized water; after drying, perform 10min ultraviolet hydrophilic treatment and set aside;

[0050] (2) Prepare the γ-polyglutamic acid dispersion, the solvent is deionized water, configure the γ-polyglutamic acid dispersion with a concentration of 1 mg / mL, and use it for later us...

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Abstract

The invention provides a nitrogen dioxide sensor based on a composite material blocking effect, and a preparation method thereof, and relates to the technical field of gas sensors and composite nanomaterials. The nitrogen dioxide sensor comprises a sensitive device, the sensitive device is provided with a gas sensitive layer, and the gas sensitive layer is made of a composite material with a blocking effect. The preparation method comprises the following steps: S1, carrying out pretreatment on a sensitive device substrate, wherein the pretreatment comprises cleaning, drying and hydrophilic treatment; S2, preparing a high-molecular polymer dispersion liquid and an inorganic conductive material dispersion liquid; S3, depositing the sensitive material dispersion liquid on the sensitive device substrate to form a gas sensitive layer; and S4, drying and aging the sensitive device with the gas sensitive layer to obtain the nitrogen dioxide sensor based on the blocking effect of the composite material. The nitrogen dioxide sensor disclosed by the invention has the characteristics of large response, high response/recovery speed, good recovery, good repeatability and the like, can work at room temperature, does not need auxiliary means such as illumination or heating and the like, and is beneficial to development of green, energy-saving and low-power-consumption devices.

Description

technical field [0001] The invention relates to the technical field of gas sensors and composite nanomaterials, in particular to a nitrogen dioxide sensor based on the blocking effect of composite materials and a preparation method thereof. Background technique [0002] As a poisonous and irritating gas, nitrogen dioxide (NO 2 ) is the main air pollutant, which can cause reduction of atmospheric visibility, acidification of surface water, eutrophication and increase of toxin content of aquatic organisms; in addition, NO 2 After being inhaled by the human body, it is highly irritating and corrosive to lung tissue. Therefore, the development of NO 2 Gas sensors are of great significance. [0003] Currently, NO 2 Most gas sensors are based on the electron transport mechanism. For example, the invention patent with application number 201910276010.0 discloses a nitrogen dioxide sensor based on two-dimensional molybdenum disulfide nanomaterials. Molybdenum sulfide adsorbs NO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/12
Inventor 太惠玲赵秋妮黄琦蒋亚东段再华王斯刘勃豪张亚杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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