Preparation and application of SnO2 nanorod array/reduced graphene oxide composite nanomaterial sensitive to formaldehyde gas

Abstract

The invention relates to preparation and application of a SnO2 nanorod array / reduced graphene oxide composite nanomaterial sensitive to formaldehyde gas. The raw materials used in the preparation method of the material comprise Na2SnO3. 4H2O, absolute ethyl alcohol and water. The preparation method comprises the following steps: (1) forming seed crystals on a reduced graphene oxide substrate; (2)preparing a hydrothermal synthesis precursor reaction solution; (3) putting apolytetrafluoroethylene lining filled with the precursor solution into a miniature reaction kettle for reaction; and (4) repeatedly cleaning a reaction deposition product with deionized water and absolute ethyl alcohol, separating acleaned sample, and drying to obtain a finished product. The raw materials of sodium stannate (Na2SnO3. 4H2O),solvent absolute ethyl alcohol, and water ratio andseed crystal oriented treatment technology are irreplaceable. The SnO2 nanorod array / reduced graphene oxide composite nanomaterialdisclosed by the invention can be used as a gas sensitive material, and particularly has a high-sensitivity outstanding effect on formaldehyde gas.

Description

technical field [0001] The present invention relates to a kind of SnO 2 The preparation technology of nanorod array / reduced graphene oxide composite nanomaterial and its use as a gas sensitive material to make a gas sensor, which is very sensitive to formaldehyde gas, belong to the field of gas sensing technology. Background technique [0002] Formaldehyde is a common volatile organic compound (VOCs), which is widely used in the fields of chemistry, biotechnology and medicine. At present, the annual output of formaldehyde reaches tens of millions of tons, and its demand is still growing continuously. However, long-term excessive exposure to formaldehyde will cause great and irreversible damage to the human body. Its toxicity is mainly manifested in strongly irritating eyes and skin, causing respiratory dysfunction and liver toxic lesions, and even causing fetal malformation. In addition, relevant studies have shown that the genotoxicity and mutagenicity of formaldehyde ar...

AI Technical Summary

Problems solved by technology

[0006] However, the above growth substrates, such as: sapphire, single crystal silicon, quartz, copper sheet, nickel foam, FTO and ITO conductive glass, etc. lack sufficient conductivity, flexibility and chemical stability, so that it is difficult to directly make gas sensors as sensitive materials

In addition, most of the synthetic methods used use precious metals such as platinum as catalysts and various organic solvents as surfactants, which require large-scale, precise and expensive instruments and equipment, strict experimental conditions and complicated experimental procedures.

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