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

S Sakulsermsuk1, R E Palmer, P A Sloan

  • 1Nanoscale Physics Research Laboratory, University of Birmingham, Birmingham B15 2TT, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 12, 2012
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Scanning tunneling microscopy revealed that the scanning tunneling microscopy tip influences polychlorinatedbiphenyl (PCB) molecule adsorption switching on silicon surfaces. Tip proximity affects energy barriers, suggesting dispersion interactions play a role in molecular bonding.

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Area of Science:

  • Surface Science
  • Materials Science
  • Nanotechnology

Background:

  • Polychlorinatedbiphenyls (PCBs) are persistent organic pollutants with significant environmental and health implications.
  • Understanding molecular adsorption and manipulation on surfaces is crucial for developing advanced materials and nanoscale devices.
  • The Si(111)-7 × 7 surface is a well-established model system for studying surface chemistry and physics at the atomic level.

Purpose of the Study:

  • To investigate the influence of the scanning tunneling microscopy (STM) tip on the adsorption site switching of polychlorinatedbiphenyl (PCB) molecules.
  • To explore the creation of a bi-stable configuration for PCB molecules on the Si(111)-7 × 7 surface through atomic manipulation.
  • To determine the energy barriers associated with switching and their dependence on STM tip proximity.

Main Methods:

  • Utilized scanning tunneling microscopy (STM) for atomic-scale imaging and manipulation.
  • Employed charge injection from the STM tip to induce atomic manipulation and switching of PCB molecules.
  • Analyzed switching rates and energy barriers at room temperature across a range of applied biases (+1.0 to +2.2 V).

Main Results:

  • Successfully prepared a bi-stable adsorption configuration for PCB molecules on Si(111)-7 × 7, enabling switching between two bonding arrangements.
  • Observed no dependence of the switching rate on bias voltage within the tested range.
  • Found that the STM tip's exact location influenced the measured energy barriers to switching by over 10%.

Conclusions:

  • The STM tip plays a critical role in controlling the adsorption site switching of PCB molecules.
  • The observed variation in energy barriers suggests a significant contribution from dispersion interactions between the STM tip and the PCB molecule.
  • This study provides insights into tip-molecule interactions for controlled atomic manipulation on semiconductor surfaces.