Unraveling Molecular Adsorption with Surface Raman Spectroscopy: trans-Stilbene, trans,trans-Distyrylbenzene, and trans-Azobenzene on Ag/Ge(111)

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• 作者：Li-Wei Chou ; Ya-Rong Lee ; Jyh-Chiang Jiang ; Jiing-Chyuan Lin ; Juen-Kai Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：January 20, 2011
• 年：2011
• 卷：115
• 期：2
• 页码：516-520
• 全文大小：209K
• 年卷期：v.115,no.2(January 20, 2011)
• ISSN：1932-7455

文摘

Deposition of organic molecules on inorganic substrates is an important step in the fabrication of organic electronic devices with designated optoelectronic properties. Their interaction with the surface underneath and the interaction among themselves influence the molecular orientation of the first adsorbed layer and thus energy and charge transport properties of the grown organic films. We show that these interactions of trans-stilbene, trans,trans-distyrylbenzene, and trans-azobenzene adsorbed on Ag/Ge(111) -(鈭? 脳 鈭?)R30掳 surface are reflected on their Raman signatures. Detailed spectral analysis reveals the characteristic vibrational features corresponding to the molecules residing in the first adlayer and in the layers above, separately. The results further show that for all the three different molecular systems, the integrated intensity of the multilayer Raman signature increases linearly with the molecular coverage. This study explores potential utilization of Raman spectroscopy as a sensitive, noninvasive tool to characterize the intricate molecule鈭抯urface interaction and to quantify physisorbed molecular systems.