Spectroelectrochemical Properties of Ultra-Thin Indium Tin Oxide Films under Electric Potential Modulation.
Spectroelectrochemical Properties of Ultra-Thin Indium Tin Oxide Films under Electric Potential Modulation.
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DOI：
10.1016/j.tsf.2016.02.018
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发表时间：
2016-03-31
期刊：
影响因子：
2.1
通讯作者：
Mendes SB
中科院分区：
文献类型：
--
作者：
Han X;Mendes SB
在这项工作中，超薄 ITO 薄膜的光谱特性在施加的电势调制下进行了表征。为了检测微小的光谱特征，超薄 ITO 薄膜被涂覆在极其灵敏的单模集成光波导上，该波导提供了长光程，并且对于超薄膜的光学询问具有足够的灵敏度。利用宽带光和多条激光线在施加电势的不同调制方案下的实验配置来阐明内在变化的本质。超薄 ITO 薄膜的折射率（吸收系数）的虚部明确地显示出对所施加电势的依赖性，并且即使对于小光谱窗口（500-600 nm）内的波长，这种依赖性的分布也会发生很大的变化。本文报告的表征技术和数据对于 ITO 材料作为透明导电电极的多种应用至关重要，例如在表面限制氧化还原物质的光谱电化学研究中。
In this work, the spectroscopic properties of ultra-thin ITO films are characterized under an applied electric potential modulation. To detect minute spectroscopic features, the ultra-thin ITO film was coated over an extremely sensitive single-mode integrated optical waveguide, which provided a long pathlength with more than adequate sensitivity for optical interrogation of the ultra-thin film. Experimental configurations with broadband light and several laser lines at different modulation schemes of an applied electric potential were utilized to elucidate the nature of intrinsic changes. The imaginary component of the refractive index (absorption coefficient) of the ultra-thin ITO film is unequivocally shown to have a dependence on the applied potential and the profile of this dependence changes substantially even for wavelengths inside a small spectral window (500–600 nm). The characterization technique and the data reported here can be crucial to several applications of the ITO material as a transparent conductive electrode, as for example in spectroelectrochemical investigations of surface-confined redox species.