In Situ Visualization of Fast Surface Ion Diffusion in Vanadium Dioxide Nanowires,Nano Letters

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In Situ Visualization of Fast Surface Ion Diffusion in Vanadium Dioxide Nanowires
Nano Letters ( IF 9.6 ) Pub Date : 2017-11-15 00:00:00 , DOI: 10.1021/acs.nanolett.7b03832
Yasen Hou ₁ , Rui Xiao ₁ , Xin Tong ₂ , Scott Dhuey ₃ , Dong Yu ₁

Affiliation

We investigate in situ ion diffusion in vanadium dioxide (VO₂) nanowires (NWs) by using photocurrent imaging. Alkali metal ions are injected into a NW segment via ionic liquid gating and are shown to diffuse along the NW axis. The visualization of ion diffusion is realized by spatially resolved photocurrent measurements, which detect the charge carrier density change associated with the ion incorporation. Diffusion constants are determined to be on the order of 10^–10 cm²/s for both Li⁺ and Na⁺ ions at room temperature, while H⁺ diffuses much slower. The ion diffusion is also found to occur mainly at the surface of the NWs, as metal contacts can effectively block the ion diffusion. This novel method of visualizing ion distribution is expected to be applied to study ion diffusion in a broad range of materials, providing key insights on phase transition electronics and energy storage applications.

中文翻译：

二氧化钒纳米线中快速表面离子扩散的原位可视化

我们使用光电流成像技术研究了二氧化钒（VO ₂）纳米线（NWs）中的原位离子扩散。碱金属离子通过离子液体门控注入到NW段中，并显示沿NW轴扩散。离子扩散的可视化是通过空间分辨的光电流测量实现的，该测量可检测与离子结合相关的电荷载流子密度变化。对于室温下的Li ⁺和Na ⁺离子，扩散常数确定为10 – ¹⁰ cm ² / s量级，而H ⁺扩散要慢得多。还发现离子扩散主要发生在NW的表面，因为金属触点可以有效地阻止离子扩散。有望将这种可视化离子分布的新颖方法应用于研究多种材料中的离子扩散，从而提供有关相变电子学和能量存储应用的关键见识。

更新日期：2017-11-16

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