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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Modulating surficial oxygen vacancy of the VO2 nanostructure to boost its electromagnetic absorption performance
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Modulating surficial oxygen vacancy of the VO2 nanostructure to boost its electromagnetic absorption performance

机译：调节VO2纳米结构的曲面氧空位，提升其电磁吸收性能

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Endowing a transition metal oxide (TMO) with oxygen vacancy is an efficient strategy to tune its electronic structure and electric properties. In this work, we put forward an exquisite VO2-NaBH4 grinding treatment for the tuning of surficial oxygen vacancy of VO2 nanostructures under ambient conditions, and systematically investigate the electromagnetic absorption (EMA) properties of treated VO2. Electron paramagnetic resonance (ESR) spectroscopy and X-ray photoelectron spectroscopy (XPS) demonstrate that the formation of oxygen vacancy occurs via the reaction of H- in NaBH4 with surficial V-O-H of VO2. First-principles simulations and experimental results reveal the correlation between oxygen vacancy and electrical conductivity. It is found that the EMA performance of VO2 is closely associated with its oxygen vacancy content and can be efficiently regulated by tuning the mass ratio of VO2 and NaBH4. Enhanced electrical conductivity and improved polarization relaxation are thought to be the main reasons for the enhanced EMA performance. This research provides a new idea for the tuning of surficial oxygen vacancy as well as the design of novel EMA materials.
机译：赋予过渡金属氧化物（TMO）氧空位是调节其电子结构和电性能的有效策略。在这项工作中，我们提出了一种精细的VO2-NaBH4研磨处理，用于在环境条件下调节VO2纳米结构的表面氧空位，并系统地研究了处理过的VO2的电磁吸收（EMA）特性。电子顺磁共振（ESR）光谱和X射线光电子能谱（XPS）表明，氧空位的形成是通过NaBH4中的H-与VO2表面的V-O-H反应实现的。第一性原理模拟和实验结果揭示了氧空位和电导率之间的关系。研究发现，VO2的EMA性能与其氧空位含量密切相关，可以通过调节VO2和NaBH4的质量比来有效调节。导电性的增强和极化弛豫的改善被认为是EMA性能增强的主要原因。本研究为表面氧空位的调节以及新型EMA材料的设计提供了新的思路。

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