Substrate-induced freezing of alkane monolayers adsorbed on Au(111) dependant on the alkane/gold misfit

被引：16

作者：

Cousty, J ^{[1
]}

Marchenko, A

机构：

[1] CEA Saclay, DSM, DRECAM, SPCSI,Ctr Etud Saclay, F-91191 Gif Sur Yvette, France

[2] Inst Phys, UA-252022 Kiev, Ukraine

来源：

SURFACE SCIENCE | 2002年 / 520卷 / 03期

关键词：

self-assembly; scanning tunneling microscopy; alkanes; gold; solid-liquid interfaces; surface thermodynamics (including phase transitions);

D O I：

10.1016/S0039-6028(02)02305-1

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：

The molecular structure of the interfaces between pure CnH2n+2(n = 10, 12, 14, 16) and Au(1 1 1) surface has been studied by scanning tunneling microscopy. At 291 K, self-organized monolayers with a lamella structure are formed with these alkanes. The ordered monolayers are melting at temperature higher by 46, 28, 15, 5 K than the melting point of bulk CnH2n+2 crystals with n = 10, 12, 14, 16, respectively. Two kinds of melting process were observed: (i) a direct solid/liquid phase transition within the monolayer for C10H22, C12H26 and C14H30 molecules, (ii) an intermediate phase for C16H34 molecules. This mesophase corresponds to a two-dimensional liquid crystal formed by molecules moving along their axis and along Au<110>. These results agree well with calculations using a geometric model taking in account the misfit between the CH2-CH2-CH2 period along alkyl chain and the gold lattice along <110> direction. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：128 / 136

页数：9

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