Electromechanical Properties of Self-Assembled Monolayers of Tetrathiafulvalene Derivatives Studied by Conducting Probe Atomic Force Microscopy

被引:20
|
作者
Ditzler, Lindsay R. [1 ]
Karunatilaka, Chandana [1 ]
Donuru, Venkat R. [2 ]
Liu, Haiying Y. [2 ]
Tivanski, Alexei V. [1 ]
机构
[1] Univ Iowa, Dept Chem, Iowa City, IA 52242 USA
[2] Michigan Technol Univ, Dept Chem, Houghton, MI 49931 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 10期
关键词
MOLECULE-METAL JUNCTIONS; ELECTRON-TRANSPORT; STRUCTURAL-CHARACTERIZATION; ALKANETHIOL MONOLAYERS; GOLD; RESISTANCE; AU(111); SERIES; FILMS;
D O I
10.1021/jp9073834
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 electrical conduction of metal-molecule-metal junctions formed between Au-supported self-assembled monolayers (SAMs) of symmetric tetrathiafulvalene (TTF) derivatives and a Pt-coated atomic force microscope (AFM) tip has been measured Under different compression forces using conducting probe AFM. The TTFs are linked to the metal through double metal-thiol linkers oil both sides of the molecule. The TTF junctions exhibit remarkably high electrical conduction with estimated single molecule resistance of 14.7 +/- 3.4 G Omega, corresponding to the Molecular resistivity of 390 Q-cm. A single molecule resistance of I comparable length 1-decanethiol molecule is estimated to be several orders of magnitude higher with the value of 950 +/- 22 G Omega. The TTF junction resistance displayed a Unique nonlinear dependence with the compression force. The dependence is attributed to the change in the intermolecular electronic coupling between the TTF molecules.
引用
收藏
页码:4429 / 4435
页数:7
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