Thursday, March 22, 2012, 10:00 am — CFN, Building 735, Conf. B
Single molecule dynamics and desorption are important processes in single molecular devices, surface chemistry, and other applications. Scanning tunneling microscopy (STM) is a powerful tool for probing such processes at the single atom or molecule level. In this talk, I will discuss our STM studies on the rotation of single molecules on the Au(111) surface and the desorption of hydrogen from graphene on silicon carbide (SiC). In the first study, we observed the rotational motion of single tetra-tert-butyl zinc phthalocyanine molecules on the Au(111) surface with a fixed off-center rotation axis. A chemical bonding between a nitrogen atom in the molecule and a gold adatom at the surface forms an off-center rotation axis. Furthermore, these single molecular rotors self-assemble into large scale ordered arrays on the gold surface. In the second study, we investigated the STM induced hydrogen desorption from graphene on SiC, and measured the dependence of desorption yield on the energy and flux of the electrons, which provides valuable information about the stability of hydrogen on graphene and the mechanism of hydrogen desorption from graphene.
Host: Peter Sutter
Joann Tesoriero
Center for Functional Nanomaterials
P.O. Box 5000
Bldg. 735
Upton, NY 11973Tel: (631) 344-7791
Fax: (631) 344-7769
Tesoriero@bnl.gov
Hosted by: Peter Sutter
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