First Combined Electron Paramagnetic Resonance and FT-IR Spectroscopic Evidence for Reversible O2 Adsorption on In2O3鈥?i>x Nanoparticles

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• 作者：Nicolas Siedl ; Philipp G眉gel ; Oliver Diwald
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：October 10, 2013
• 年：2013
• 卷：117
• 期：40
• 页码：20722-20729
• 全文大小：353K
• 年卷期：v.117,no.40(October 10, 2013)
• ISSN：1932-7455

文摘

Adsorption-induced electronic property changes determine the performance of nanostructured transparent conductive oxides and sensor materials. For the study of O₂ adsorption on electron rich In₂O_3鈥?i>x nanoparticles we used transmission FT-IR spectroscopy in combination with electron paramagnetic resonance (EPR). The reversible emergence and annihilation of conduction band electrons is subject to O₂ adsorption and was tracked at different oxygen pressures via IR active Drude absorptions. Corresponding results were related to EPR measurements that were performed under identical experimental conditions. For the first time we identified a weak adsorption complex between O₂ and the surface of In₂O_3鈥?i>x nanoparticles in the temperature range between T = 90 K and T = 298 K. Complementing and supporting our FT-IR observations, this evidence opens the way to study sensing relevant adsorption processes at room temperature with spectroscopy.