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Probing the Molecular Conformation of Self-Assembled Monolayers at Metal/Semiconductor Interfaces by Vibrational Sum Frequency Generation Spectroscopy
| Title: | Probing the Molecular Conformation of Self-Assembled Monolayers at Metal/Semiconductor Interfaces by Vibrational Sum Frequency Generation Spectroscopy |
| Authors: | Asanuma, Hidehiko Browse this author | | Noguchi, Hidenori Browse this author →KAKEN DB | | Huang, Yifan Browse this author | | Uosaki, Kohei Browse this author →KAKEN DB | | Yu, Hua-Zhong Browse this author |
| Issue Date: | 17-Dec-2009 |
| Publisher: | American Chemical Society |
| Journal Title: | Journal of Physical Chemistry C |
| Volume: | 113 |
| Issue: | 50 |
| Start Page: | 21139 |
| End Page: | 21146 |
| Publisher DOI: | 10.1021/jp9062675 |
| Abstract: | The conformation of self-assembled monolayers (SAMs) buried at metal-semiconductor interfaces plays a crucial role in the functioning of the molecular junctions thus formed. We have studied by vibrational sum frequency generation (SFG) spectroscopy the influence of deposited gold films on the molecular orientation of a series of n-alkyl monolayers that are covalently bonded to silicon(111) via Si-C linkages (≡Si-CnH_[2n+1],n = 10, 12, 14, and 18). The SFG spectra indicate that the gold contacts (overlayers) introduce significant gauche defects within the initially highly oriented alkyl chains. The methyl tilt angles of the buried n-alkyl monolayers depend on the gold deposition method (vacuum evaporation vs sputtering) and the alkyl chain length. These observations are supported by solid-state electrical measurements. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/50209 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 魚崎 浩平
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