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

Journal Article · Wed Jul 27 00:00:00 EDT 1994 · Journal of the American Chemical Society; (United States)

DOI:https://doi.org/10.1021/ja00094a039· OSTI ID:6840953

Schott, J H; Ward, M D ^[1]

---

1. Univ. of Minnesota, Minneapolis, MN (United States)

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. 23 refs., 4 figs.

• OSTI ID: 6840953
• Journal Information: Journal of the American Chemical Society; (United States), Vol. 116:15; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ORGANIC COMPOUNDS
CRYSTAL GROWTH
ELECTRIC CONDUCTIVITY
ELECTRON MICROSCOPY
SUBLIMATION
ANISOTROPY
FILMS
GOLD
SOLID CLUSTERS
ELECTRICAL PROPERTIES
ELEMENTS
EVAPORATION
METALS
MICROSCOPY
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
360601 - Other Materials- Preparation & Manufacture
360606 - Other Materials- Physical Properties- (1992-)