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
CN109632895BActive Publication Date: 2021-04-06CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHONGQING UNIV
Publication Date
2021-04-06

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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.
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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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