Gas-sensitive material for detecting low-concentration formaldehyde at room temperature and preparation method of gas-sensitive material and gas sensor

Abstract

The invention provides a gas-sensitive material for detecting low-concentration formaldehyde at a room temperature. The gas-sensitive material is a noble metal, metallic oxide and functionalized graphene ternary composite material, wherein the molar ratio of a metallic oxide to a noble metal is 0.2-5 and the mass of functionalized graphene is 15-50% of the sum of the mass of the metallic oxide and the noble metal; or the gas-sensitive material is a noble metal, metal hydroxide and functionalized graphene ternary composite material, and the molar ratio of metal hydroxide to the noble metal is 0.2-5 and the mass of the functionalized graphene is 15-50% of the sum of the mass of the metal hydroxide and the noble metal. Compared with a traditional metallic oxide gas-sensitive material, the gas-sensitive material and the gas sensor comprising the gas-sensitive material provided by the invention have the advantages that a high-temperature working environment is not needed, the power consumption is greatly reduced and resources are saved. Materials required on each sensor substrate are relatively few, so that the cost of the materials is relatively low and industrialization implementation of a formaldehyde gas sensor can be facilitated.

Description

technical field [0001] The invention relates to the technical field of gas sensitive sensors, in particular to a gas sensitive material for detecting low-concentration formaldehyde at room temperature, a preparation method thereof, and a gas sensitive sensor. Background technique [0002] With the improvement of people's living standards and the change of people's requirements for furniture environment decoration, the problem of indoor air quality has become increasingly prominent. The main indoor polluting gases after home decoration are formaldehyde and benzene series. Inhaling high concentrations of formaldehyde gas will cause great harm to the human body, such as headache, nausea, cough, and gastrointestinal disorders. According to relevant research, if the indoor formaldehyde gas concentration exceeds about 10 times the national indoor formaldehyde concentration standard, people in the room are equivalent to chronic suicide. Therefore, the detection of formaldehyde in ...

AI Technical Summary

Problems solved by technology

[0003] There are many traditional formaldehyde detection methods, but most formaldehyde gas sensors are based on electrochemical measurement. Traditional sensors have disadvantages such as poor accuracy, insufficient selectivity, and large volume.

Moreover, the existing high-sensitivity formaldehyde gas sensors need to be detected under the condition of heating, and the power consumption is very large. Therefore, it is very meaningful to develop sensors with low power consumption, small component size, long life and low price.

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