Origin of Current Enhancement through a Ferrocenylundecanethiol Island Embedded in Alkanethiol SAMs by Using Electrochemical Potential Control
Origin of Current Enhancement through a Ferrocenylundecanethiol Island Embedded in Alkanethiol SAMs by Using Electrochemical Potential Control
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DOI：
10.1021/jp072249
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发表时间：
2007-05
影响因子：
3.7
通讯作者：
Y. Yokota;K. Fukui;T. Enoki;M. Hara
中科院分区：
文献类型：
--
作者：
Y. Yokota;K. Fukui;T. Enoki;M. Hara
利用原位扫描隧道显微镜（STM）在电位控制下研究了嵌入正十硫醇SAM基质中的电活性二茂铁十一硫醇岛。与以前的报道相反，二茂铁部分的正电荷不是通过二茂铁-十一烷硫醇在金上增强电流的先决条件。相反，对于中性和单离子二茂铁基团，传导路径在确定的电位下打开。此外，尽管在电位控制下获得了稳定且可重复的图像，但在N2气氛下的常规STM测量有时不稳定，并且不可逆地改变了样品，这表明在电化学环境下进行二茂铁十一烷硫醇的电流测量要容易得多。
Electroactive ferrocenylundecanethiol islands embedded in an n-decanethiol SAM matrix were studied under potential control using in situ scanning tunneling microscopy (STM). Contrary to previous reports, the positive charges on ferrocene moieties are not a prerequisite to enhancing the current through ferrocenylundecanethiol on gold. Rather, conduction paths are opened at determined potentials for both neutral and monocationic ferrocene moieties. In addition, although stable and reproducible images were obtained under potential control, conventional STM measurements under N2 atmosphere were sometimes unstable and irreversibly changed the sample, indicating that current measurements of ferrocenylundecanethiol are much easier under an electrochemical environment.