Snapshots of crystal growth: Nanoclusters of organic conductors on Au(111) surfaces

Joachim Hossick Schott, Michael Ward

Research output: Contribution to journalArticle

Abstract

Mono- and multilayer crystalline nanoclusters of tetrathiafulvalene-tetracyanoquinodimethane ((TTF)-(TCNQ)), a low-dimensional organic conductor in the bulk form, can be formed readily on Au(111) surfaces by vapor phase sublimation under ambient conditions. Scanning tunneling microscopy of monolayer (TTF)(TCNQ) films reveals a two-dimensional density of states (DOS) that is consistent with the arrangement of TTF and TCNQ molecules in the ac face of bulk (TTF)(TCNQ), in which the molecular planes are nearly parallel to the Au(111) substrate. In contrast, clusters with thicknesses corresponding to two or three molecular layers exhibit a transformation to a highly anisotropic DOS that can be attributed to interlayer molecular overlap in segregated TTF and TCNQ molecular chains along the c axis, which can be described as "molecular wires". The orientation of the crystalline (TTF)(TCNQ) clusters is preserved throughout the crystal growth sequence, leading to meso- and macroscopic (TTF)(TCNQ) needles that are oriented perpendicular to the Au(111) substrate. These studies provide visualization of crystal growth from the initial stages of nucleation to macroscopic crystals and a revealing example of the changes in electronic structure that occur during the evolution of molecular (TTF)(TCNQ) nuclei into a bulk crystalline phase.

Original languageEnglish (US)
Pages (from-to)6806-6811
Number of pages6
JournalJournal of the American Chemical Society
Volume116
Issue number15
StatePublished - Jul 27 1994

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Organic conductors
Nanoclusters
Crystallization
Crystal growth
Crystalline materials
Monolayers
Sublimation
Scanning tunneling microscopy
Substrates
Crystal orientation
Needles
Electronic structure
Multilayers
Nucleation
Visualization
Vapors
Wire
Crystals
Molecules
tetracyanoquinodimethane

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Snapshots of crystal growth : Nanoclusters of organic conductors on Au(111) surfaces. / Schott, Joachim Hossick; Ward, Michael.

In: Journal of the American Chemical Society, Vol. 116, No. 15, 27.07.1994, p. 6806-6811.

Research output: Contribution to journalArticle

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