Molecular conformation of n-alkyl monolayers covalently bonded to Si(111) probed by infrared-visible sum-frequency spectroscopy

被引：16

作者：

Ishibashi, T

Ara, M

Tada, H

Onishi, H

机构：

[1] KAST, Surface Chem Lab, Kawasaki, Kanagawa 2130012, Japan

[2] Grad Univ Adv Studies, Dept Funct Mol Sci, Okazaki, Aichi 4448585, Japan

[3] Okazaki Natl Res Inst, Inst Mol Sci, Okazaki, Aichi 4448585, Japan

来源：

CHEMICAL PHYSICS LETTERS | 2003年 / 367卷 / 3-4期

基金：

日本学术振兴会;

关键词：

D O I：

10.1016/S0009-2614(02)01713-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Infrared-visible sum-frequency spectra of n-alkyl (CnH2n+1; n = 10-13, 18) monolayers anchored on the Si(111) surface through a Si-C covalent bond were measured for the C-H stretch region. Spectral shapes exhibited azimuth-orientation dependence compatible with the C-3v symmetry of the substrate, indicating that the monolayers were epitaxially constructed on the substrate. Three methyl bands dominated each spectrum, and two-weak methylene bands were identified. Two distinct intensity patterns of the methyl bands were observed depending on n. The observed spectra were interpreted with reference to reported molecular models of the monolayer that consist of alkyl chains with an all-trans head part and a twisted stem. (C) 2002 Elsevier Science B.V. All rights reserved.

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页码：376 / 381

页数：6

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