Composite gas-sensitive material used for detecting formaldehyde gas and preparation method thereof
A technology of gas-sensitive materials and formaldehyde gas, which is applied in the direction of material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of high working temperature, poor selectivity and stability, and achieve low working temperature, good selectivity and high sensitivity Effect
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Embodiment 1
[0057] The composite gas-sensing material provided by the present invention is metal oxide and graphene quantum dot material calculated by mass percentage, that is, the graphene quantum dot material accounts for 5%, 10%, 20%, and 30% of the total mass percentage of the composite;
[0058] The metal oxide is zinc oxide;
[0059] The graphene quantum dots are nitrogen-doped graphene quantum dots;
[0060] The zinc oxide is a regular nanosheet structure with a size of 4-10 μm and a thickness of 50-100 nm;
[0061] The graphene quantum dot material is a circular nanosheet structure with a size of 5-20nm and a thickness of 0.6-5nm.
[0062] The preparation method of the above-mentioned composite gas-sensitive material specifically includes the following steps:
[0063] 1. Preparation of ZnO nanosheets by hydrothermal method
[0064] a. Dissolve 4mmol of zinc chloride in 20ml of deionized water and stir for 10min to uniformly disperse zinc chloride in the solution; dissolve 4mmol...
Embodiment 2
[0076] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that in step 3, graphene quantum dots account for 5% of the total mass of the composite.
Embodiment 3
[0077] Embodiment 3: This embodiment is basically the same as Example 1, except that in step 3, graphene quantum dots account for 10% of the total mass of the composite.
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