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首页> 外文期刊>Chemistry: A European journal >Photoreduction of mesoporous in _2O _3: Mechanistic model and utility in gas sensing
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Photoreduction of mesoporous in _2O _3: Mechanistic model and utility in gas sensing

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摘要

A model is proposed for the drop in electronic resistance of n-type semiconducting indium oxide (In _2O _3) upon illumination with light (350 nm, 3.5 eV) as well as for the (light-enhanced) sensitivity of In _2O _3 to oxidizing gases. Essential features of the model are photoreduction and a rate-limiting oxygen-diffusion step. Ordered, mesoporous In _2O _3 with a high specific surface area serves as a versatile system for experimental studies. Analytical techniques comprise conductivity measurements under a controlled atmosphere (synthetic air, pure N _2) and temperature-resolved in-situ Fourier transform infrared (FTIR) spectroscopy. IR measurements reveal that oxygen vacancies form a donor level 0.18 eV below the conduction band.

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