Luis Berbil-Bautista
University of California, Berkeley
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Featured researches published by Luis Berbil-Bautista.
Applied Physics Letters | 2008
Matthew J. Comstock; Niv Levy; Jongweon Cho; Luis Berbil-Bautista; Michael F. Crommie; Daniel A. Poulsen; Jean M. J. Fréchet
We have used single-molecule-resolved scanning tunneling microscopy to measure the photomechanical switching rates of azobenzene-derived molecules at a gold surface during exposure to UV and visible light. This enables the direct determination of both the forward and reverse photoswitching cross sections for surface-mounted molecules at different wavelengths. In a dramatic departure from molecular behavior in solution-based environments, visible light does not efficiently reverse the reaction for azobenzene-derived molecules at a gold surface.
Nano Letters | 2009
Niv Levy; Matthew J. Comstock; Jongweon Cho; Luis Berbil-Bautista; Armen Kirakosian; Frank Lauterwasser; Daniel A. Poulsen; Jean M. J. Fréchet; Michael F. Crommie
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 molecules nanoscale environment in determining its switching properties.
ACS Nano | 2011
Jongweon Cho; Luis Berbil-Bautista; Ivan V. Pechenezhskiy; Niv Levy; Steven K. Meier; Varadharajan Srinivasan; Yosuke Kanai; Jeffrey C. Grossman; K. Peter C. Vollhardt; Michael F. Crommie
We have used scanning tunneling microscopy, Auger electron spectroscopy, and density functional theory calculations to investigate thermal and photoinduced structural transitions in (fulvalene)tetracarbonyldiruthenium molecules (designed for light energy storage) on a Au(111) surface. We find that both the parent complex and the photoisomer exhibit striking thermally induced structural phase changes on Au(111), which we attribute to the loss of carbonyl ligands from the organometallic molecules. Density functional theory calculations support this conclusion. We observe that UV exposure leads to pronounced structural change only in the parent complex, indicative of a photoisomerization reaction.
Journal of the Korean Physical Society | 2017
Jongweon Cho; Ivan V. Pechenezhskiy; Luis Berbil-Bautista; Steven K. Meier; K. Peter C. Vollhardt; Michael F. Crommie
The use of opto-thermal molecular energy storage at the nanoscale creates new opportunities for powering future microdevices with flexible synthetic tailorability. Practical application of these molecular materials, however, requires a deeper microscopic understanding of how their behavior is altered by the presence of different types of substrates. Here, we present single-molecule-resolved scanning tunneling microscopy imaging of thermally- and optically-induced structural transitions in (fulvalene)tetracarbonyldiruthenium molecules adsorbed onto a Ag(100) surface as a prototype system. Both the parent complex and the photoisomer display distinct thermally-driven phase transformations when they are in contact with a Ag(100) surface. This behavior is consistent with the loss of carbonyl ligands due to strong molecule-surface coupling. Ultraviolet radiation induces marked structural changes only in the intact parent complex, thus indicating a photoisomerization reaction. These results demonstrate how stimuli-induced structural transitions in this class of molecule depend on the nature of the underlying substrate.
Physical Review Letters | 2010
Matthew J. Comstock; David A. Strubbe; Luis Berbil-Bautista; Niv Levy; Jongweon Cho; Daniel A. Poulsen; Jean M. J. Fréchet; Steven G. Louie; Michael F. Crommie
Journal of Physical Chemistry C | 2012
Ivan V. Pechenezhskiy; Jongweon Cho; Giang D. Nguyen; Luis Berbil-Bautista; Brandon L. Giles; Daniel A. Poulsen; Jean M. J. Fréchet; Michael F. Crommie
Archive | 2010
Jongweon Cho; Ivan V. Pechenezhskiy; Luis Berbil-Bautista; Daniel A. Poulsen; Jean M. J. Fréchet; Michael F. Crommie
Archive | 2009
Jongweon Cho; Luis Berbil-Bautista; Niv Levy; Stephan M. Meier; K. Peter C. Vollhardt; Michael F. Crommie
Archive | 2008
Luis Berbil-Bautista; Jongweon Cho; Niv Levy; Matthew J. Comstock; Daniel A. Poulsen; Jean M. J. Fréchet; Michael F. Crommie
Bulletin of the American Physical Society | 2008
Jongweon Cho; Matthew J. Comstock; Niv Levy; Luis Berbil-Bautista; Frank Lauterwasser; Jean M. J. Fréchet; Michael F. Crommie