High Performance Novel Gas Sensor Device for Site Environmental Protection Using Ti_0.5Sn_0.5O₂ Nanomaterials

Abstract

SnO2 and TiO2 have attracted the most attention due to their unique chemical and electrical properties in basic research of functional materials and applied research of materials. The performance of composite oxide or solid solution material is better than that of monomer oxide. Therefore, SnO2?TiO2 composite oxide system has become one of the active composite materials studied at home and Abroad. A large number of reports have shown that a certain proportion of SnO2?TiO2 composite material can obtain the best gas-sensitive performance, but this proportion has a great relationship with the crystal structure and process conditions of the material preparation. Therefore, in this paper, Ti0.5Sn0.5O2 solid solution materials with Sn/Ti molar ratio of 1/1 were prepared at different sintering temperatures, and their structure and gas-sensitive properties were studied. After sintering at 650 °C, the samples were mainly closely combined with rutile SnO2 and anatase type TiO2 particles, and some Sn and Ti ions were replaced. After sintering at 1050 °C, the composite mode of SnO2/TiO2 was dominated by solid solution and rutile Ti?Sn?O2 solid solution. The samples prepared at different sintering temperatures have different gas-sensitive properties for methanol, ethanol and other organic gases and the gas-sensitive properties of the prepared SnO2?TiO2 composite decreased with the increase of sintering temperature.

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