Variable-temperature scanning tunneling microscopy and scanning tunneling spectroscopy study on copper phthalocyanine ultrathin films on a Au(111) surface

J Nanosci Nanotechnol. 2002 Apr;2(2):139-42. doi: 10.1166/jnn.2002.093.

Abstract

Variable-temperature high-resolution scanning tunneling microscopy (STM) images reveal that well-ordered copper phthalocyanine (CuPc) strips can be self-assembled by depositing CuPc molecules on a Au(111) surface. The self-assembled strips are supposed to result from the balance of the intermolecular interaction and the interaction between the molecules and substrate during annealing. The energy band (approximately 1.9-2.1 eV) of CuPc, measured by scanning tunneling spectroscopy (STS), is comparable to the optical band gap (approximately 1.7 eV). Spectroscopic measurements confirm that a dipole layer and/or an effect of image force exist at the CuPc/Au(111) interface.

Publication types

  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Crystallization / methods
  • Electric Conductivity
  • Electrochemistry / methods
  • Gold / chemistry*
  • Indoles / chemistry*
  • Materials Testing / instrumentation
  • Materials Testing / methods*
  • Microchemistry / methods
  • Microscopy, Scanning Tunneling / methods*
  • Nanotechnology / instrumentation
  • Nanotechnology / methods*
  • Organometallic Compounds / chemistry*
  • Semiconductors
  • Spectrum Analysis / methods*
  • Surface Properties
  • Temperature

Substances

  • Indoles
  • Organometallic Compounds
  • copper phthalocyanine
  • Gold