Self-assembled mixed monolayer containing ferrocenylthiol molecules : STM observations and electrochemical investigations
Self-assembled mixed monolayer containing ferrocenylthiol molecules : STM observations and electrochemical investigations
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DOI：
10.1016/j.electacta.2006.12.026
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发表时间：
2007-03
影响因子：
6.6
通讯作者：
Sho Fujii;S. Kurokawa;K. Murase;Kyunghwang Lee;A. Sakai;H. Sugimura
中科院分区：
文献类型：
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作者：
Sho Fujii;S. Kurokawa;K. Murase;Kyunghwang Lee;A. Sakai;H. Sugimura
本文研究了由11-二茂铁-1-十一硫醇（11-FUT）和己硫醇分子通过交换法形成的混合自组装单层（sam）的形成行为和电化学性质。在循环伏安图中识别出两个氧化还原峰，表明在金底物上的11-FUT分子具有两种不同的状态。与Ag/AgCl （3M NaCl）相比，在约360mV下观察到的峰值电位的不变性表明，与交换过程的时间无关，11-FUT分子某些部分的局部堆积密度是恒定的；即在11-FUT乙醇溶液中的浸泡时间。这是由11-FUT分子结构域的形成造成的。STM图像显示，当己硫醇分子被11-FUT分子取代时，形成了纳米结构域。这些结果表明，在循环伏安图中观察到的氧化还原峰分裂是由于底物上11-FUT分子的局部密度的差异。
We have investigated the formation behavior and electrochemical properties of mixed self-assembled monolayers (SAMs) composed of 11-ferrocenyl-1-undecanethiol (11-FUT) and hexanethiol molecules formed using an exchange method. Two redox peaks were recognized in the cyclic voltammograms, indicating that 11-FUT molecules on gold substrates have two different states. The invariability of the peak potential observed at about 360mV versus Ag/AgCl (3M NaCl) evidenced that the local packing density in some parts of 11-FUT molecules is constant, irrespective of the time for the exchange process; that is, the immersion time in the 11-FUT ethanol solution. This is accounted for by the formation of the domains of 11-FUT molecules. STM images showed the formation of nano-domains when the hexanethiol molecules were replaced with 11-FUT molecules. These results suggest that the redox peak splitting observed in cyclic voltammograms is due to the difference in the local density of the 11-FUT molecules on the substrates.