Orientation of Decanethiol Molecules in Self-Assembled Monolayers Determined by Inelastic Electron Tunneling Spectroscopy

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• 作者：Jian-Cai Leng ; Li− ; Li Lin ; Xiu-Neng Song ; Zong-Liang Li ; Chuan-Kui Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：October 22, 2009
• 年：2009
• 卷：113
• 期：42
• 页码：18353-18357
• 全文大小：250K
• 年卷期：v.113,no.42(October 22, 2009)
• ISSN：1932-7455

文摘

We present first-principles calculations for the inelastic electron tunneling spectroscopy (IETS) of decanethiolate molecules sandwiched between Au(111) surface and scanning tunneling microscope (STM) tip, as reported by Hallbck et al. (Nano Lett. 2004, 4, 2393). It is demonstrated here that the IET spectra are very sensitive to the molecule−metal contact structure, orientation of the molecule adsorbed on the surface, and the distance between the carbon of the terminal methyl group and the STM tip. With correct assignation of the experimental spectral features, the orientation of the molecule and then the probable configuration of the molecular junction are determined.