Diamond optically transparent electrodes: demonstration of concept with ferri/ferrocyanide and methyl viologen.
Diamond optically transparent electrodes: demonstration of concept with ferri/ferrocyanide and methyl viologen.
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金刚石光学透明电极：用铁/亚铁氰化物和甲基紫精进行概念演示。
DOI：
10.1021/ac001257i
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发表时间：
2001
影响因子：
7.4
通讯作者：
G. Swain
中科院分区：
文献类型：
--
作者：
J. Zak;J. Butler;G. Swain
报道了一种新型的光学透明电极--导电金刚石薄膜。该电极是自立式的（0.38 mm厚和8 mm直径），在10微米的线性距离上机械抛光至7 nm rms粗糙度，硼掺杂（在反应气体混合物中为0.05% B/C），并安装在薄层透射池中。该电极具有约225 nm的短波长截止，这是材料的间接带隙，并透射出至少1，000 nm的光。理论上，除了硼受体带和本征多声子吸收外，电极具有从225 nm到远红外的光学窗口。该电极用于将亚铁氰化物电氧化为铁氰化物，并且光谱监测与氧化产物（λ max = 420 nm）的形成相关的吸光度变化。该电极还用于将甲基紫精（MV 2+）电还原为阳离子自由基（MV+*）和中性自由基（MV 0）。用光谱法监测MV 2+的消耗（λ max = 257 nm）和MV+* 的形成（λ max = 398和605 nm）。
A new type of optically transparent electrode is reported on--an electrically conductive diamond thin film. The electrode was free-standing (0.38 mm thick and 8 mm in diameter), mechanically polished to a 7-nm rms roughness over a 10-microm linear distance, boron-doped (0.05% B/C in the reactant gas mixture), and mounted in a thinlayer transmission cell. The electrode has a short-wavelength cutoff of approximately 225 nm, which is the indirect band gap of the material, and transmits light out to at least 1,000 nm. In theory, the electrode has an optical window from 225 nm well out into the far-infrared, except for the boron acceptor band and the intrinsic multiphonon absorptions. The electrode was used to electrooxidize ferrocyanide to ferricyanide, and the absorbance change associated with the formation of the oxidized product (lambdamax = 420 nm) was spectroscopically monitored. The electrode was also used to electroreduce methyl viologen (MV2+) to the cation radical (MV+*) and the neutral (MV0). The depletion of MV2+ (lambdamax = 257 nm) and formation of MV+* (lambdama = 398 and 605 nm) were spectroscopically monitored.