Detection of oxygen vacancies in oxides by defect-dependent cataluminescence
Detection of oxygen vacancies in oxides by defect-dependent cataluminescence
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通过缺陷依赖性催化发光检测氧化物中的氧空位
DOI：
10.1021/acs.analchem.5b02267
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发表时间：
2015
影响因子：
7.4
通讯作者：
Chao Lu
中科院分区：
文献类型：
--
作者：
Lijuan Zhang;Si Wang;Chao Lu
氧空位可以控制氧化物的许多不同性质。然而，由于氧空位的种类难以捉摸且含量高度稀释，快速、简单地检测氧空位是一个巨大的挑战。在这项工作中，我们发现TiO2纳米颗粒表面乙醚氧化反应中的催化发光（CTL）强度与氧空位的含量成正比。氧空位依赖性乙醚CTL归因于氧空位中丰富的化学吸附O2可以促进其与化学吸附的乙醚分子的接触反应，从而导致CTL强度明显提高。因此，乙醚 CTL 可以作为 TiO2 纳米颗粒中氧空位的简单探针。通过检测不同温度下金属离子掺杂的TiO2纳米粒子(Cu、Fe、Co、Cr)和氢处理的TiO2纳米粒子在不同氧空位的TiO2表面上乙醚的CTL强度，验证了其可行性。本CTL探针的氧空位含量与传统X射线光电子能谱(XPS)技术获得的氧空位含量非常一致。与已开发的方法相比，所开发的 CTL 探针具有快速响应、易于操作、低成本、长期稳定性和配置简单等优越特性。我们相信氧空位敏感的CTL探针在区分氧化物中的氧空位方面具有巨大的潜力。
Oxygen vacancies can control a number of distinct properties of oxides. However, rapid and simple detection of oxygen vacancies is a great challenge owing to their elusive species and highly diluted contents. In this work, we have discovered that cataluminescence (CTL) intensity in diethyl ether oxidation reaction on the surface of TiO2nanoparticles is proportional to the content of oxygen vacancies. The oxygen vacancy-dependent diethyl ether CTL is attributed to the fact that abundant chemisorbed O2in oxygen vacancies could facilitate its contact reaction with chemisorbed diethyl ether molecules, resulting in an obvious improvement of CTL intensity. Therefore, diethyl ether CTL can be employed as a simple probe for oxygen vacancies in TiO2nanoparticles. Its feasibility is validated by detecting the CTL intensity of diethyl ether on the surface of TiO2with variable oxygen vacancies by metal ion-doped TiO2nanoparticles (Cu, Fe, Co, and Cr) and hydrogen-treated TiO2nanoparticles at different temperatures. The content of oxygen vacancies by the present CTL probe is in good agreement with that obtained by conventional X-ray photoelectron spectroscopy (XPS) technique. The superior properties of the developed CTL probe over already-developed methods include fast response, easy operation, low cost, long-term stability, and simple configuration. We believe that the oxygen vacancy-sensitive CTL probe has a great potential in distinguishing oxygen vacancies in oxides.