Electrochemically Triggered Metal–Insulator Transition between VO2 and V2O5
Electrochemically Triggered Metal–Insulator Transition between VO2 and V2O5
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DOI：
10.1002/adfm.201803024
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发表时间：
2018-06
影响因子：
19
通讯作者：
Qiyang Lu;S. Bishop;Dongkyu Lee;Shinbuhm Lee;H. Bluhm;H. Tuller;Ho Nyung Lee;B. Yildiz
中科院分区：
文献类型：
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作者：
Qiyang Lu;S. Bishop;Dongkyu Lee;Shinbuhm Lee;H. Bluhm;H. Tuller;Ho Nyung Lee;B. Yildiz
多相氧化钒（VOx）的独特性能使该材料家族对先进的电子器件，催化和储能具有吸引力。在这项工作中，VOx的相边界的交叉和独特的电子特性，通过电化学调谐VOx薄膜的氧含量在很宽的温度范围内获得。在两个相邻的VOx相，VO2和V2O5，得到可逆的相变。阴极偏压触发从V2O5到VO2的相变，伴随着宽带隙的消失。当去除偏压时，转化相是稳定的，而当电化学偏压反转时，转化相是可逆的。通过跟踪施加正弦电偏压时X射线吸收峰的时间依赖性响应来监测相变的动力学。VO2和V2O5之间的电化学可控相变表明，通过跨越多个结构相，能够引起VOx的电子性质发生重大变化。这一概念可以转移到其他多相氧化物的电子，磁性或电化学应用。
Distinct properties of multiple phases of vanadium oxide (VOx) render this material family attractive for advanced electronic devices, catalysis, and energy storage. In this work, phase boundaries of VOx are crossed and distinct electronic properties are obtained by electrochemically tuning the oxygen content of VOx thin films under a wide range of temperatures. Reversible phase transitions between two adjacent VOx phases, VO2 and V2O5, are obtained. Cathodic biases trigger the phase transition from V2O5 to VO2, accompanied by disappearance of the wide band gap. The transformed phase is stable upon removal of the bias while reversible upon reversal of the electrochemical bias. The kinetics of the phase transition is monitored by tracking the time‐dependent response of the X‐ray absorption peaks upon the application of a sinusoidal electrical bias. The electrochemically controllable phase transition between VO2 and V2O5 demonstrates the ability to induce major changes in the electronic properties of VOx by spanning multiple structural phases. This concept is transferable to other multiphase oxides for electronic, magnetic, or electrochemical applications.