Exploring the Interactions of Oxygen with Defective ZnO

ChemistryOpen
Xuan WangHengshan Qiu

Abstract

Exploring the interactions of oxygen with defective oxide is of importance to understand the microscopic process and performance of ZnO-based oxygen sensors. The interactions of environmental oxygen with vacuum-annealed defective ZnO have been studied by electrical methods, vacuum Fourier transform infrared spectroscopy, and in situ adsorption experiments. It was found that the vacuum-annealed defective ZnO exhibits varied electrical response at different temperatures, which, by vacuum IR investigation, was ascribed to the subtle balance between formation of oxygen vacancies and their interactions with environmental oxygen. Further studies showed that two microscopic steps including surface adsorption and bulk diffusion were dominating the interactions between defective ZnO and environmental oxygen, and the corresponding apparent activation energies were estimated to be 0.093 and 0.67 eV through in situ adsorption experiments. The quite low activation barrier of oxygen adsorption on the defective ZnO was proposed to be responsible for the extreme high sensitivity of ZnO-based oxygen sensors.

References

Jan 22, 2002·Physical Review Letters·Detlev M HofmannPavel G Baranov
Apr 5, 2005·Angewandte Chemie·Melanie KurtzChristof Wöll
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Citations

Feb 24, 2020·The Journal of Chemical Physics·Yunjun CaoXinhe Bao
Jan 10, 2021·Sensors·Vadim PlatonovAlexander Gaskov
Jun 17, 2021·Biosensors & Bioelectronics·Rupa HaldavnekarDr Bo Tan

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