Molecular Orientation in Octanedithiol and Hexadecanethiol Monolayers on GaAs and Au Measured by Infrared Spectroscopic Ellipsometry

被引：31

作者：

Rosu, Dana M. ^{[1
]}

Jones, Jason C. ^{[2
]}

Hsu, Julia W. P. ^{[2
]}

Kavanagh, Karen L. ^{[3
]}

Tsankov, Dimiter ^{[4
]}

Schade, Ulrich ^{[5
]}

Esser, Norbert ^{[1
]}

Hinrichs, Karsten ^{[1
]}

机构：

[1] ISAS Inst Analyt Sci, Dept Berlin, D-12489 Berlin, Germany

[2] Sandia Natl Labs, Albuquerque, NM 87185 USA

[3] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada

[4] Bulgarian Acad Sci, Inst Organ Chem, BG-1113 Sofia, Bulgaria

[5] Berliner Elektronenspeicherring Gesell Synchrotro, D-12489 Berlin, Germany

来源：

LANGMUIR | 2009年 / 25卷 / 02期

关键词：

SELF-ASSEMBLED MONOLAYERS; BARE SEMICONDUCTOR SURFACES; N-ALKANETHIOLATE MONOLAYERS; CHAIN-LENGTH DEPENDENCE; WETTING PROPERTIES; HOMOLOGOUS SERIES; ORGANIC FILMS; GOLD;

D O I：

10.1021/la8026557

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Infrared spectroscopic ellipsometry was used for determination of molecular orientation and for lateral homogeneity studies of organic monolayers on GaAs and Au, the organic layer being either octanedithiol or hexadecanethiol (HDT). The laterally resolved measurements were performed with the infrared mapping ellipsometer at the synchrotron storage ring BESSY II. The molecular orientation within the monolayers was determined by optical model simulations of the measured ellipsometric spectra. Different tilt angles were obtained for the monolayers of HDT and octanedithiol on GaAs: 19 degrees and > 30 degrees, respectively. The tilt angle of the methylene chains for HDT on Au substrate (22 degrees) is similar to the 190 tilt which was obtained for the HDT monolayers on GaAs, thus suggesting similar molecular ordering of the thiolates on both substrates.

引用

页码：919 / 923

页数：5

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