X-ray-induced reduction of a surfactant/polyoxotungstate hybrid compound

被引：8

作者：

Colusso, Aaron V. ^{[1
]}

McDonagh, Andrew ^{[1
]}

Cortie, Michael B. ^{[1
]}

机构：

[1] Institute for Nanoscale Technology, School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo,NSW,2007, Australia

来源：

Surface and Interface Analysis | 2018年 / 50卷 / 12-13期

关键词：

Photochromism - Photoelectrons - Hybrid materials - Surface active agents - Binding energy - Photons - Transition metals - Tungsten compounds;

D O I：

10.1002/sia.6516

中图分类号：

学科分类号：

摘要：

We investigate the spontaneous reduction of a photochromic surfactant/polyoxotungstate hybrid during repeated X-ray photoelectron spectroscopy (XPS) scans and show how this effect may confound attempts to use soft X-rays to characterise materials of this nature. The W4f core-level spectra revealed a progressive increase of W5+ and W4+ species at the expense of W6+ as irradiation time increased. The samples developed a blue colour attributed to the presence of W4+ and/or W5+. The progressive photoreduction is also associated with a shift of the W6+ peak within the W4f spectrum to lower binding energies. This work highlights the need to consider inadvertent changes in oxidation state during X-ray photoelectron spectroscopy characterisation of samples containing photoreducible transition metals. © 2018 John Wiley & Sons, Ltd.

引用

页码：1384 / 1388