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Transition voltage spectroscopy of porphyrin molecular wires

Bennett, Neil, Xu, Gengzhao, Esdaile, Louisa J., Anderson, Harry L., Macdonald, John Emyr and Elliott, Martin 2010. Transition voltage spectroscopy of porphyrin molecular wires. Small 6 (22) , pp. 2604-2611. 10.1002/smll.201001046

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Measurements are presented of the current-voltage (I–V) characteristics of individual thiol-tethered porphyrin molecules (isolated in an alkanethiol matrix) and of self-assembled monolayers. In both cases, it is found that I/V2 displays a minimum at a characteristic “transition voltage” Vm. Repeated measurements of the transition voltage enable both its time development and statistical behavior to be determined. For isolated molecules, the transition voltage shows a multipeaked distribution of values, indicating the presence of a small number of distinct molecular/contact configurations, each having different transport characteristics. For self-assembled monolayers, in contrast, a single-peaked distribution was observed, which is consistent with parallel conduction through many molecules

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Uncontrolled Keywords: Contact asymmetry ; Porphyrins ; Single molecules ; Scanning tunneling microscopytransition voltage spectroscopy
Publisher: Wiley
ISSN: 1613-6810
Last Modified: 04 Jun 2017 01:59

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