Self-Patterned Molecular Photoswitching in Nanoscale Surface Assemblies
Nano Letters2009Vol. 9(3), pp. 935–939
Citations Over TimeTop 10% of 2009 papers
Niv Levy, Matthew Comstock, Jongweon Cho, Luis Berbil-Bautista, А. Киракосян, Frank Lauterwasser, Daniel A. Poulsen, Jean M. J. Fréchet, Michael F. Crommie
Abstract
Photomechanical switching (photoisomerization) of molecules at a surface is found to strongly depend on molecule-molecule interactions and molecule-surface orientation. Scanning tunneling microscopy was used to image photoswitching behavior in the single-molecule limit of tetra-tert-butyl-azobenzene molecules adsorbed onto Au(111) at 30 K. Photoswitching behavior varied strongly with surface molecular island structure, and self-patterned stripes of switching and nonswitching regions were observed having approximately 10 nm pitch. These findings can be summarized into photoswitching selection rules that highlight the important role played by a molecule's nanoscale environment in determining its switching properties.
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