Photothermoelectric Detection of Gold Oxide Nonthermal Decomposition
Photothermoelectric Detection of Gold Oxide Nonthermal Decomposition
复制标题
氧化金非热分解的光热电检测
DOI：
10.1021/acs.nanolett.8b03153
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发表时间：
2018
期刊：
影响因子：
10.8
通讯作者：
Natelson, Douglas
中科院分区：
文献类型：
--
作者：
Wang, Xifan;Evans, Charlotte I.;Natelson, Douglas
将金置于强氧化环境（如氧等离子体）中，可以形成在室温下亚稳定的氧化金薄涂层。我们报告扫描光电压测量光刻定义的金纳米线后，氧等离子体曝光。在设备的第一次光学扫描期间检测到的光电压比在后续扫描上映射的光电压大几倍。第一扫描增强的光电压与纳米结构的电阻降低回到预氧暴露水平相关。重复氧等离子体暴露“修复”器械。这些组合的光电压和运输测量意味着增强的光电压的结果从Au和氧化的Au之间的结的光热电响应，与光学驱动的氧化物的分解。与已知的AuOx分解的温度依赖性动力学的比较表明，光驱动的分解不是一个纯粹的热效应。这些实验表明，结合光学和电子测量可以提供一个窗口的表面敏感的光化学过程。
A thin coating of gold oxide, metastable at room temperature, can be formed by placing gold in a strongly oxidizing environment such as an oxygen plasma. We report scanning photovoltage measurements of lithographically defined gold nanowires subsequent to oxygen plasma exposure. Photovoltages are detected during the first optical scan of the devices that are several times larger than those mapped on subsequent scans. The first-scan enhanced photovoltage correlates with a reduction of the electrical resistance of the nanostructure back to preoxygen-exposure levels. Repeating oxygen plasma exposure “reinitializes” the devices. These combined photovoltage and transport measurements imply that the enhanced photovoltage results from the photothermoelectric response of a junction between Au and oxidized Au, with an optically driven decomposition of the oxide. Comparisons with the known temperature-dependent kinetics of AuOx decomposition suggest that the light-driven decomposition is not a purely thermal effect. These experiments demonstrate that combined optical and electronic measurements can provide a window on surface-sensitive photochemical processes.