Production of tubing network-structured nano-stannic oxide gas-sensing material

Abstract

The invention relates to a preparation method of nanometer two oxides tin gas sensitive material in three-dimensional tubulous network structure , adopting the eggshell film of birds to be raw material based on biological form board synthetic technology, after the separation and clean pretreatment of the egg film ,doing steeping optimizing treatment by dipping it in tin salt aqueous solution, carrying out oxidizing firing treatment then, forming tin dioxide nanometer crystal in the original place under the effect of biological form board , gaining a nanometer two oxides tin gas sensitive material in three-dimensional tubulous network structure of with advantageous function . The technology of the invention is simple, the cost is cheap, the gained gas sensitive material is composed of high crystal degree nanometer pellet ,it has the structure of three-dimensional communicating tubulous network, the gained gas sensitive component has these advantages such as the stability is good , the selectivity is much, assembling and treating is easily, it can be applied to the detecting devices such as automobile tail gas measurement , enterprise exhaust emission , the anti-leakage device of deliquescing station ,it has the fine application prospect in the fields as the electron electricity, industry and civil use.

Description

technical field [0001] The invention relates to a method for preparing a three-dimensional tubular network structure nano-tin dioxide gas-sensitive material, and prepares a gas-sensitive material with a special graded structure crystal, a high specific surface area, and small-sized nanoparticles, and belongs to the technical field of sensing materials. Background technique [0002] With the advancement of science and technology and the development of industry, industrial waste gas and vehicle exhaust emissions have caused great pollution to the atmosphere, causing serious damage to the urban environment and the health of residents. Therefore, gas sensors used to detect toxic gases play an important role in people's lives. The role is getting bigger and bigger. SnO 2 It is an n-type semiconductor gas sensor, and its application in gas sensors has attracted much attention. Nano SnO 2 There are many preparation methods, mainly physical methods (such as sputtering method, vap...

AI Technical Summary

Problems solved by technology

On the one hand, the technology is complex, on the other hand, the powder is often unevenly distributed, the structure is loose, and there is no complex hierarchical structure, which limits the performance of gas sensitivity.

Another example is Chinese patent 2003141921.6, titled: "a zeolite-based nano-tin dioxide gas-sensing material and its preparation method", 200510035581.3, titled: "a tin dioxide-based composite nano-gas-sensing material and its preparation method", Its characteristic is that it is used to prepare gas-sensing materials after preparing nano-powders. However, the gas-sensing materials prepared in this way lack a hierarchical structure that is conducive to further improving their gas-sensitivity.

Although foreign countries have also studied the use of chemical self-assembly to synthesize hierarchical materials, it is difficult to obtain bulk materials with direct application value through self-assembly.