Preparing and regulating a bi-stable molecular switch by atomic manipulation


Sakulsermsuk, S., Palmer, R. E. and Sloan, P. A., 2012. Preparing and regulating a bi-stable molecular switch by atomic manipulation. Journal of Physics-Condensed Matter, 24 (39), 394014.

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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 + 2.2 V. 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.


Item Type Articles
CreatorsSakulsermsuk, S., Palmer, R. E. and Sloan, P. A.
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DepartmentsFaculty of Science > Physics
ID Code31746


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