Composite gas sensitive material and its preparation method, gas sensor and its application

A gas sensor and gas-sensitive material technology, applied in the direction of material resistance, material analysis, material analysis by electromagnetic means, etc., can solve heating and other problems, and achieve the effect of increasing accessibility, high conductivity, high activity and sensitivity

Active Publication Date: 2021-04-06
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this stage, most sensing materials can only test ppm-level nitrogen dioxide gas at room temperature, and some even require auxiliary conditions such as heating and light when necessary

Method used

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  • Composite gas sensitive material and its preparation method, gas sensor and its application
  • Composite gas sensitive material and its preparation method, gas sensor and its application
  • Composite gas sensitive material and its preparation method, gas sensor and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The composite gas-sensing material in this embodiment includes reduced graphene oxide, and the surface of reduced graphene oxide is loaded with zero-dimensional cuprous oxide quantum dots; reduced graphene oxide is multilayer reduced graphene oxide, and two adjacent layers of reduced graphene oxide A support material is filled between them, and the support material is three-dimensional cuprous oxide nanoparticles.

[0043] The composite gas-sensitive material in this specific embodiment adopts the mechanical mixing method to make, and electron microscope figure is as follows figure 1 Shown: Francium cone-shaped cuprous oxide nanoparticles are distributed in piles, and the reduced graphene oxide is also unevenly distributed.

[0044] The gas response of the gas sensor made of the gas sensitive composite material prepared in this example at normal temperature is as follows: figure 2 Shown: The figure shows the response of the gas sensor to different concentrations of ni...

Embodiment 2

[0046]The composite gas-sensing material in this embodiment includes reduced graphene oxide, and the surface of reduced graphene oxide is loaded with zero-dimensional cuprous oxide quantum dots; reduced graphene oxide is multilayer reduced graphene oxide, and two adjacent layers of reduced graphene oxide A support material is filled between them, and the support material is a one-dimensional cuprous oxide nanowire.

[0047] The composite gas-sensitive material in this specific embodiment adopts the mechanical mixing method to make, and electron microscope figure is as follows image 3 Shown: the reduced graphene oxide and one-dimensional cuprous oxide nanowires are evenly distributed, but there is no obvious hole structure, and the nanowire structure tends to aggregate into bundles.

Embodiment 3

[0049] The composite gas-sensitive material in this embodiment includes reduced graphene oxide, and the surface of the reduced graphene oxide is loaded with zero-dimensional cuprous oxide quantum dots; the reduced graphene oxide is a multilayer reduced graphene oxide, and two adjacent layers of reduced graphite oxide A support material is filled between the olefins, and the support material includes a one-dimensional cuprous oxide nanowire and a three-dimensional cuprous oxide nanoparticle.

[0050] The composite gas-sensing material of this embodiment is prepared by chemical synthesis, using copper acetate solution, graphene oxide dispersion, sodium hydroxide solution and vitamin C solution with a volume ratio of 4:2.5:5:6, and includes the following steps :

[0051] Step 1: Take copper acetate and add it to ultrapure water to form a copper acetate solution with a concentration of 2 mg / ml, and add the copper acetate solution to a graphene oxide dispersion with a concentration...

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Abstract

The invention discloses a composite gas-sensing material, comprising multi-layer reduced graphene oxide, the surface of the reduced graphene oxide is loaded with zero-dimensional cuprous oxide quantum dots, and one-dimensional cuprous oxide is filled between two adjacent layers of reduced graphene oxide nanowires and\or three-dimensional cuprous oxide nanoparticles. Also disclosed is a preparation method, comprising preparing a mixed solution of copper acetate solution and graphene oxide dispersion, adding dropwise sodium hydroxide solution to the mixed solution to obtain a brown-green precipitate, adding the precipitate to a reducing agent solution for heating reaction , a black precipitate is obtained, and the black precipitate is cleaned and sealed to obtain a composite gas-sensing material. A gas sensor made of the composite gas sensitive material and the application of the gas sensor are also disclosed. The invention solves the technical problem that the gas-sensitive material in the prior art needs auxiliary means to respond to gas, can improve the sensitivity to nitrogen dioxide at normal temperature, and can also respond to ammonia gas at normal temperature.

Description

technical field [0001] The invention belongs to the technical field of gas sensitive materials and gas sensors. Background technique [0002] Nitrogen dioxide is a common toxic gas in the fields of industry, agriculture and health. How to detect toxic gas efficiently and accurately has become an important problem to be solved in the field of gas sensing. Among the current mainstream gas detection methods, gas sensors based on metal oxide semiconductors have been widely used in gas detection, but traditional semiconductor gas sensors need to work under external conditions such as high temperature or auxiliary light radiation. [0003] Compared with other metal oxides, cuprous oxide, as a typical P-type semiconductor, is widely used in photocatalysis, solar cells, and gas sensing due to its outstanding photoelectric properties. However, from the perspective of energy consumption and safety, the high temperature working environment is still an important factor restricting the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 郭永彩朱相宜周泳高潮任浩彭波
Owner CHONGQING UNIV
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