PHASE-SEPARATION OF MIXED-COMPOSITION SELF-ASSEMBLED MONOLAYERS INTO NANOMETER-SCALE MOLECULAR DOMAINS

被引:368
作者
STRANICK, SJ
PARIKH, AN
TAO, YT
ALLARA, DL
WEISS, PS
机构
[1] PENN STATE UNIV,DEPT CHEM,UNIVERSITY PK,PA 16802
[2] PENN STATE UNIV,DEPT MAT SCI & ENGN,UNIVERSITY PK,PA 16802
[3] ACAD SINICA,INST CHEM,TAIPEI,TAIWAN
关键词
D O I
10.1021/j100082a040
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
Scanning tunneling microscopy has been used to demonstrate phase segregation in varied composition, two-component self-assembled monolayers on gold. These monolayer films were assembled using CH3(CH2)(15)SH and CH3O2C(CH2)(15)SH, two similar alkanethiol molecules which are non-hydrogen-bonding and have identical alkyl chain lengths. X-ray photoelectron spectroscopy, infrared spectroscopy, and ellipsometry have been used to characterize the average chemical compositions and average molecular structures of these films. Scanning tunneling microscopy of single composition, self-assembled monolayers of each of these molecules shows a preponderance of defects which can be attributed to single missing chains. In mixed composition films, we observe nanometer scale molecular domains with time-dependent shapes. These observations have important implications both for the fundamental understanding of solubilities and phase segregation in quasi-two-dimensional mixtures and for applications of self-assembly in which spatial patterns of adsorbate mixtures are important.
引用
收藏
页码:7636 / 7646
页数:11
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