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Self-patterned molecular photoswitching in nanoscale surface assemblies.

Niv Levy1, Matthew J Comstock, Jongweon Cho

  • 1Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, USA.

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Molecular photoswitching on surfaces depends on interactions and orientation. Researchers observed patterned switching in azobenzene molecules on gold, revealing nanoscale environmental effects on photoisomerization.

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Area of Science:

  • Surface Science
  • Molecular Electronics
  • Photochemistry

Background:

  • Photomechanical switching, or photoisomerization, is crucial for molecular devices.
  • Understanding molecule-surface and molecule-molecule interactions is key to controlling this behavior.

Purpose of the Study:

  • To investigate the influence of molecular environment on photomechanical switching.
  • To determine the role of molecule-molecule interactions and surface orientation in photoisomerization.

Main Methods:

  • Utilized scanning tunneling microscopy (STM) to image single molecules.
  • Studied tetra-tert-butyl-azobenzene molecules adsorbed on Au(111) at low temperatures (30 K).

Main Results:

  • Photoswitching behavior strongly depended on molecular island structure.
  • Observed self-patterned stripes of switching and non-switching regions with a 10 nm pitch.
  • Identified nanoscale environmental factors influencing photoisomerization.

Conclusions:

  • Developed photoswitching selection rules based on experimental observations.
  • The nanoscale environment significantly dictates a molecule's switching properties.
  • Surface and intermolecular interactions are critical for controlling molecular photoisomerization.