An STM and Theoretical Study of the Interaction of hexabenzocorone on a Ru(0001) Surface

ORAL

Abstract

The interaction of hexabenzocorone (hbc) with a metal surface has been investigated using Scanning Tunneling Microscopy (STM) and Scanning Tunneling Spectroscopy (STS) in ultrahigh vacuum. The images obtained at room temperature, after hbc molecules were vacuum deposited at 325$^{o}$C onto a pristine ruthenium (0001) surface, exhibit surface bound molecules with off-centered bonding sites. I(V) curves over hbc molecules show high tunneling current at positive bias voltages. After annealing of the hbc-bonded Ru sample surface at 600$^{o}$C for 15min, hbc molecules appear to aggregate laterally and to bond symmetrically to the surface. The possibility of growing carbon nanotubes on the hbc-Ru precursor surface upon dosing with C$_{2}$H$_{2}$ will also be discussed along with a theoretical model for bonding and growth of nanotubes.

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Authors

  • Kwang Taeg Rim

  • Li Liu

    Department of Chemistry and Columbia Center for Integrated Science and Engineering, Columbia University

  • Chaochin Su

    Department of Molecular Science and Engineering, National Taipei University of Technology

  • Shengxiong Xiao

  • Michael Steigerwald

    Department of Chemistry and Columbia Center for Integrated Science and Engineering, Columbia University

  • Mark Hybertsen

    Applied Physics and Applied Math Dept, Columbia University, Department of Applied Physics and Center for Transport in Molecular Nanostructures, Columbia University, Applied Physics and Applied Math. Dept, Columbia University, Department of Applied Physics and Applied Mathematics and Columbia Center for Integrated Science and Engineering, Columbia University

  • Colin Nuckolls

    Columbia University

  • George Flynn

    Chemistry Department, Columbia University, Dept of Chem and Columbia Center for Integrated Science and Engineering, Columbia Univ, Department of Chemistry and Columbia Center for Integrated Science and Engineering, Columbia University