A bond-fluctuation mechanism for stochastic switching in wired molecules

Autor:	Ganesh K. Ramachandran, Larry A. Nagahara, Alex Primak, Adam M. Rawlett, Theresa J. Hopson, Stuart Lindsay
Rok vydání:	2003
Předmět:	Arrhenius equation Multidisciplinary Chemistry Molecular electronics Nanotechnology Activation energy Conductivity Ring (chemistry) Electron localization function symbols.namesake Chemical bond Chemical physics symbols Molecule
Zdroj:	Science (New York, N.Y.). 300(5624)
ISSN:	1095-9203
Popis:	Stochastic on-off conductivity switching observed in phenylene-ethynylene oligomers has been explained in terms of changes in ring conformations, or electron localization, or both. We report the observation of stochastic on-off switching in the simplest of wired molecules: octanedithiol, decanedithiol, and dodecanedithiol bonded on an Au(111) surface. Stochastic switching was observed even when a top gold contact was pressed on by a conducting atomic force microscope tip at constant force. The rate of switching increased substantially at 60°C, a temperature at which these films are commonly annealed. Because such switching in alkanethiols is unlikely to be caused by internal molecular electronic changes and cannot be fully accounted for by breaking of the top contact, we argue that the cause is the well-known mobility of molecules tethered to gold via a thiol linkage.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::26d877b7b277691b2f6d8e4128162a02 https://pubmed.ncbi.nlm.nih.gov/12775835 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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