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Title: Preparing and regulating a bi-stable molecular switch by atomic manipulation
Authors: S. Sakulsermsuk
R. E. Palmer
P. A. Sloan
Keywords: Materials Science
Physics and Astronomy
Issue Date: 3-Jan-2012
Abstract: We present a scanning tunneling microscopy (STM) investigation into the influence of the STM tip on the adsorption site switching of polychlorinatedbiphenyl (PCB) molecules on the Si(111)-7×7 surface at room temperature. From an initially stable adsorption configuration, atomic manipulation by charge injection from the STM tip prepared a new bi-stable configuration that switched between two bonding arrangements. No switching rate bias dependence was found for +1.0 to +2.2V. Assuming a thermally driven switching process we find that the measured energy barriers to switching are influenced by the exact location of the STM tip by more than 10%. We propose that this energy difference is due the dispersion interaction between the tip and the molecule. © 2012 IOP Publishing Ltd.
ISSN: 1361648X
Appears in Collections:CMUL: Journal Articles

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