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Structural transition and temperature-driven conductivity switching of single crystalline VO2(A) nanowires

机译：VO2（A）单晶纳米线的结构转变和温度驱动的电导率转换

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摘要

Single crystalline VO2(A) nanowires were synthesized by a facile hydrothermal method. The structural transition and temperature-driven conductivity switching of the VO2(A) nanowires were investigated. Our experimental results show that VO2(A) nanowires exhibit a distinct structural transition accompanied with an order of magnitude change in resistance, and a clear temperature-dependent current switching hysteresis. In order to analyze experimental results, theoretically, the electrical conductivity behavior was found to be consistent with Mott's small polaron model, the first-principles calculations also indicated that the apical V-O bond changes were mainly responsible for the band gap evolution and hence led to the conductivity switching.
机译：通过一种简便的水热法合成了单晶VO2（A）纳米线。研究了VO2（A）纳米线的结构转变和温度驱动的电导率转换。我们的实验结果表明，VO2（A）纳米线表现出明显的结构转变，并伴随着电阻的数量级变化，以及清晰的温度相关电流开关滞后。为了分析实验结果，从理论上讲，发现电导率行为与Mott的小极化子模型一致，第一性原理计算还表明，顶端VO键的变化主要是带隙演化的原因，因此导致电导率切换。

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