Preparation method of tin based nano composite material for detecting low concentration acetone gas

Abstract

The invention relates to a preparation method of a tin based nano composite material for detecting low concentration acetone gas, and aims to solve the problems that in the prior art, a gas sensitive material for detecting acetone gas does not respond to low concentration acetone gas, the sensitivity on high concentration acetone gas is low, the responding speed is slow, and the selectivity stability is bad. The composite material comprises the following raw materials: stannous chloride, sodium chloride, sodium citrate, and praseodymium nitrate, and is prepared by the following steps: hydrothermal synthesis in a reactor, microwave heating high temperature heat treatment, grinding, and sieving. The technology is advanced, the data is precise, the product morphology is good, the product has a sheet flower-shaped layered structure, the sheet thickness is not more than 30 nm, the product purity is good and can reach 99%; the sensitivity of the composite material on acetone gas (100 ppm) can reach 27, the responding time is 2 seconds, the recovery time is 36 seconds, the sensitivity on acetone gas (1 ppm) can reach 1.86, the responding speed is quick, the composite material is suitable for low concentration acetone detection, and can be used to prepare sensors for detecting acetone gas, and the provided preparation method is advanced.

Description

technical field [0001] The invention relates to a preparation method of a tin-based nanocomposite material for detecting low-concentration acetone gas, belonging to the technical field of preparation and application of gas-sensitive materials. Background technique [0002] As a chemical reagent, acetone has been widely used in industrial fields, such as: purifying paraffin, dissolving plastic and rubber, synthesizing chloroform and epoxy resin, preparing plexiglass monomer, etc.; but contacting and inhaling acetone can cause nausea, fatigue, Headache, vomiting, and even coma; in addition, acetone is a metabolite of the human body, and its concentration can reflect the state of the human body; among the hundreds of metabolites produced by breathing, acetone is related to diabetes, and the concentration of acetone exhaled by normal people is 0.3-0.9 The concentration of acetone exhaled by diabetic patients is above 1.8ppm. How to accurately and quickly detect acetone is very i...

AI Technical Summary

Problems solved by technology

[0003] Usually, gas chromatography and mass spectrometry are used to detect acetone gas, but the equipment used by these technologies occupies a large area and is complicated to operate; metal semiconductor oxide gas sensor detectors are the most suitable for detecting acetone gas due to their easy fabrication and accurate detection. good choice

[0004] At present, metal-semiconductor oxide gas sensors are still under research, and there are still many shortcomings. For example, most pure-phase metal-semiconductor oxides have low sensitivity, slow response speed, poor selectivity and stability, and no sensitivity to low-concentration gas to be measured. Disadvantages, it is difficult to meet the complex requirements of gas sensors in practical applications; in order to improve the sensitivity, response speed, and orientation selectivity of gas sensors to meet the requirements of practical applications, gas-sensitive materials are often doped with load agents, or through heterojunction To enhance the gas-sensing properties of gas-sensing materials, this technology is still in the research stage

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