Self-Assembly of Low-Dimensional Conductors on Au(111) Surfaces

Abstract

Two-dimensional nanoclusters of (TTF) (TCNQ) (TTF = tetrathiafulvalene TCNQ = tetracyanoquinodmethane) and Li+ TCNQ-, formed on Au (111) surfaces by vapor phase sublimation under ambient conditions prior to growth of bulk crystals of these low-dimensional organic conductors, have been observed with scanning tunneling microscopy (STM) and scanning electron microscopy (SEM). The molecular planes of the constituents in individual nanoclusters are oriented perpendicular to the Au (111) substrate, while the clusters exhibit azimuthal orientations conforming to the threefold Au <110> directions. The nanocluster morphology and structure suggest that self-assembly of nanoclusters is governed by specific interactions between the molecular species and the substrate and molecular diffusion along <110> troughs on the Au (111) substrate surface. In the case of the (TTF) (TCNQ) nanoclusters, TTF and TCNQ molecules assemble into molecular rows normal to the stacking direction, with intermolecular distances along the stacking direction which are nearly identical to those observed in bulk (TTF) (TCNQ)

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Document Details

Document Type
Technical Report
Publication Date
Jun 23, 1994
Accession Number
ADA280936

Entities

People

  • J. H. Schott
  • M. D. Ward

Organizations

  • University of Minnesota

Tags

DTIC Thesaurus Topics

  • Assembly
  • Bulk Materials
  • Charge Transfer
  • Chemical Engineering
  • Crystal Lattices
  • Crystal Structure
  • Crystals
  • Electron Microscopy
  • High Resolution
  • Materials
  • Materials Science
  • Microscopy
  • Military Research
  • Minnesota
  • Orientation (Direction)
  • Scanning Electron Microscopy
  • Self Assembly

Fields of Study

  • Chemistry

Readers

  • Electrochemical Surface Science
  • Nanocomposite Materials Science
  • Polymer Science and Technology

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene