Dynamics of oligo(phenylene-ethynylene) self-assembled monolayers on Au(111)

被引：6

作者：

Wu, Hairong ^{[1
]}

Sotthewes, Kai ^{[1
]}

Mendez-Ardoy, Alejandro ^{[1
]}

Kudernac, Tibor ^{[1
]}

Huskens, Jurriaan ^{[1
]}

Lenferink, Aufried ^{[2
]}

Otto, Cees ^{[2
]}

Schon, Peter M. ^{[1
]}

Vancso, G. Julius ^{[1
]}

Zandvliet, Harold J. W. ^{[1
]}

机构：

[1] Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

[2] Univ Twente, Med Cell Biophys Grp, NL-7500 AE Enschede, Netherlands

来源：

CHEMICAL PHYSICS LETTERS | 2014年 / 614卷

关键词：

CONTROLLED CONDUCTANCE; TRANSPORT; ALKANETHIOLS; MOLECULES; MECHANISM; GOLD;

D O I：

10.1016/j.cplett.2014.09.007

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：

Oligo(phenylene-ethynylene), self-assembled monolayers on Au(1 1 1) have been studied with scanning tunneling microscopy. The oligo(phenylene-ethynylene) molecules are adsorbed in a flat-lying orientation. Time-resolved scanning tunneling microscopy measurements reveal that the molecules continuously switch back and forth between two nearly degenerate configurations. The energy difference between the two configurations is 22 +/- 5 meV and the activation barrier for the transition from the low-energy configuration to the high-energy configuration is 0.65 +/- 0.03 eV. A statistical analysis of the residence times revealed that the switching process is stochastic. We propose that the two level switching is due to a torsional mode of the central phenyl ring. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：45 / 48

页数：4

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