2008
DOI: 10.1021/jp709745z
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A Comprehensive Study of the Single Molecule Conductance of α,ω-Dicarboxylic Acid-Terminated Alkanes

Abstract: We present here a comprehensive study of the single molecule conductance of alkanes with carboxylic-acid terminal groups, investigated with the I(s) and I(t) scanning tunneling microscopy (STM) methods. These methods enable the formation of single molecular bridges between the gold substrate surface and gold STM tip without the need to first form a metallic break junction. The I(s) and I(t) methods have up until this study been used primarily with thiol head groups, and this current study shows that they can b… Show more

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Cited by 53 publications
(57 citation statements)
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“…Extensive investigations of electron transport through alkane monolayers in electrochemical experiments has resulted in a consensus that b ¼ 1.0 per CH 2 group (0.8 Å À1 ), meaning that the current decreases by a factor of e À1 for each additional CH 2 group. [102] As noted in past reviews [18,56,90] and recent reports, [103] single-molecule junctions containing alkane molecules of increasing length also yield b values in a range of $0.8 to 1.0 per CH 2 group (1-1.2 Å…”
Section: Single-molecule Junctionsmentioning
confidence: 88%
“…Extensive investigations of electron transport through alkane monolayers in electrochemical experiments has resulted in a consensus that b ¼ 1.0 per CH 2 group (0.8 Å À1 ), meaning that the current decreases by a factor of e À1 for each additional CH 2 group. [102] As noted in past reviews [18,56,90] and recent reports, [103] single-molecule junctions containing alkane molecules of increasing length also yield b values in a range of $0.8 to 1.0 per CH 2 group (1-1.2 Å…”
Section: Single-molecule Junctionsmentioning
confidence: 88%
“…As the resulting chains of gold atoms are broken, step decreases in the current approximately corresponding to the quantum of conductance G 0 are seen until the final chain of gold atoms is broken. In the presence of molecules that contain terminal potential binding groups (e.g., thiols [8], pyridines [8][9][10], amines [11,12], carboxylate anions [11,13], phosphines [14,15], thioethers [14]), additional much smaller current step decreases are seen after the final gold atomic chain breaks, and these correspond to the subsequent breaking of metal-molecule-metal junctions. Alternatively, in the so-called I (z) (I , current; z, vertical height) method for measuring single-molecule electrical properties, a gold STM tip is brought into close proximity of a surface coated with suitable molecules without allowing it to come into contact, and is then retracted while the tunneling current is monitored [16].…”
Section: Introductionmentioning
confidence: 99%
“…For instance, carboxylic and polycarboxylic acids can be adsorbed on metal surfaces and form different adlayer structures depending on the electrode potential [7][8][9][10][11][12]. The affinity of carboxylate group for gold surfaces has also been used to measure the conductance of individual dicarboxylic molecules tethered between a gold surface and the gold tip of a scanning tunnelling microscope [13]; these experiments are typically performed in high electric fields. Studying the adsorption, under polarisation conditions, of dicarboxylic acids on model surfaces allows a better understanding of the influence of the electrode potential on the nature, interfacial structure and thermodynamic properties of the adsorbed monolayers.…”
Section: Introductionmentioning
confidence: 99%