Accession Number:

ADA280936

Title:

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

Descriptive Note:

Technical rept. no. 3, 1 May 1993-30 Jun 1994

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCE

Personal Author(s):

• Schott, J. H.
• Ward, M. D.

Report Date:

1994-06-23

Pagination or Media Count:

32.0

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

Descriptors:

• *CONDUCTIVITY
• *SURFACES
• *GOLD
• *ORGANIC COMPOUNDS
• SCANNING
• TWO DIMENSIONAL
• CRYSTALS
• VAPOR PHASES
• DIFFUSION
• POLYMORPHISM
• STACKING
• AZIMUTH
• TUNNELING
• MOLECULAR STRUCTURE
• SUBLIMATION
• ELECTRON MICROSCOPY
• NUCLEATION
• SUBSTRATES
• FRACTALS

Subject Categories:

• Inorganic Chemistry
• Organic Chemistry
• Physical Chemistry
• Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE