Preparation method of In2O3/SnO2 gas sensitive material with porous structure

Abstract

The invention relates to a preparation method of an In2O3 / SnO2 gas sensitive material with a porous structure. The method comprises the following steps: mixing commercial In2O3 powder and SnO2 powder in a weight ratio of 4:1 or 7:3 or 3:2 place and mixing, compressing into a green body, and then placing the green body in a sintering furnace with oxygen atmosphere and carrying out solid phase sintering to finally obtain the In2O3 / SnO2 gas sensitive material with the porous structure. The method of the invention controls the sintering temperature to obtain the In2O3 / SnO2 gas sensitive material with the micron or submicron grade porous structure with regular holes, thus the porous structure is adopted to increase the specific area so as to increase the gas sensitivity and the weight of In2O3 / SnO2 is controlled to increase the selectivity to different gases. Therefore, the gas sensitive material with the porous structure which has high sensitivity and selectivity can be obtained. The method adopted by the invention has the advantages of easy preparation of raw material, low cost, clean production, is easy to control, and the like.

Description

technical field [0001] The invention relates to the technical field of ceramic material synthesis, in particular to an In 2 o 3 / SnO 2 The invention discloses a preparation method of a porous structure gas-sensing material. Background technique [0002] With the development of science and technology, the requirements for the detection, monitoring and alarm of flammable and toxic gases are getting higher and higher, which puts forward higher requirements for the gas-sensitive materials that the detection relies on; Sensitivity, selectivity, and long-term stability, as well as reducing operating temperature and shortening response recovery time have become important directions for the development of gas-sensitive materials. [0003] At present, researchers generally believe that the methods to improve the comprehensive performance of gas-sensing materials mainly include doping metal ions (including noble metals or rare earth elements) or metal oxides, increasing the specifi...

AI Technical Summary

Problems solved by technology

Although the porous microstructure plays an important role in improving the gas sensitivity of gas-sensitive materials, the same metal oxide is not only sensitive to one gas under certain temperature conditions, but may be sensitive to several gases, which leads people to be sensitive to gas types. The difficulty of detection requires further improvement of the selectivity of gas-sensitive materials, so that the prepared sensor is only sensitive to the detected gas during use; the realization of this goal is difficult with only one metal oxide material, Therefore, gas-sensing material researchers proposed to use composite metal oxides to improve the selectivity of gas-sensing materials.