Abstract
TiO2 based gas sensors in recent years have been widely studied for application in SF6 insulation devices to estimate their insulation status through the detection of SF6 decomposed components, due to their strong adsorption ability and sensing performance towards gas molecules. To further improve the sensitivity and selectivity of such sensing materials, this paper proposes to modify TiO2 surface by N and F co-doping and stimulate the adsorption process of three SF6 decomposed components (SO2, SOF2 and SO2F2) onto N, F-co-doped TiO2 surface. In order to determine the change of gas sensing properties of TiO2 nanotube gas sensor after N and F co-doping, the calculated results were compared with single doping of N and F. Results show that, compared with non-doping, co-doping of N and F makes the adsorption structure more stable, and the adsorption of N, F-co-doped TiO2 surface to three decomposition components is enhanced; N-doped TiO2 has the problem of cross-sensitivity to SO2 and SOF2 gases. N, F-co-doped TiO2 improves the sensitivity to SO2 gas on the basis of F-doped TiO2 and shows better selectivity for SO2 gas.
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