TiO2/graphene nanocomposites from the direct reduction of graphene oxide by metal evaporation
TiO2/graphene nanocomposites from the direct reduction of graphene oxide by metal evaporation
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DOI：
10.1016/j.carbon.2013.11.008
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发表时间：
2014-03-01
期刊：
影响因子：
10.9
通讯作者：
Granozzi, Gaetano
中科院分区：
文献类型：
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作者：
Favaro, Marco;Agnoli, Stefano;Granozzi, Gaetano
我们证明了氧化石墨烯可以通过在高真空中蒸发金属钛来有效地还原。通过结合原位光电子能谱测量和DFT计算提供了该反应的详细描述：钛原子容易与氧化石墨烯的含氧基团反应，破坏C-O键，从而形成二氧化钛并回收se杂化的碳原子。当所有的表面氧被消耗时，钛可以与碳基质反应并形成碳化物物质。共振光电子能谱测量允许识别Ti-C和Ti-O-C状态的价带中的存在和精确的能量位置，其被认为控制跨越TiO 2/石墨烯界面的电子和能量转移。因此，通过这项研究，我们提供了一种通用的方法和基本原理，用于在原子水平上控制石墨烯/金属氧化物纳米复合材料界面的性质。(C)2013爱思唯尔有限公司保留所有权利。
We demonstrate that graphene oxide can be efficiently reduced by evaporating metal Titanium in high vacuum. A detailed description of this reaction is provided by combining in situ photoemission spectroscopy measurements and DFT calculations: the titanium atoms readily react with the oxygenated groups of graphene oxide, disrupting the C-O bonds, with the consequent formation of titania and the recovery of the se hybridized carbon atoms. When all surface oxygen is consumed, titanium can react with the carbon substrate and form carbidic species. Resonant photoemission spectroscopy measurements allow identifying the presence and exact energy position in the valence band of the Ti-C and Ti-O-C states, which are supposed to control the electron and energy transfer across the TiO2/graphene interface. Therefore with this study we provide a versatile method and the rationale for controlling, at the atomic level, the nature of the interface of graphene/metal oxide nanocomposites. (C) 2013 Elsevier Ltd. All rights reserved.