Polyhedral and cylindrical structures of tungsten disulphide
Conference
·
OSTI ID:141085
- Weizmann Institute, Rehovot (Israel)
The recent interest in fullerene chemistry has stimulated research into associated polyhedral and cylindrical carbon structures. Up to now, such closed structures have been confined to carbon. The authors describe here closed polygonal and cylindrical structures of tungsten disulphide, a layered semiconductor, prepared by heating thin W films on quartz in a H{sub 2}S atmosphere. Transmission electron microscopy reveals a variety of closed concentric polyhedral and cylindrical structures varying in size from <10 nm to several 100 nm. The closed nature of the crystals have been verified by electron and lattice imaging. In some cases, crystals join into chains or clusters with a common plane between any two individual crystals. The crystals were found to be stable over an extended period of time. It is believed that the crystals contain, besides atomic hexagonal units, other polyhedral units. The closed structures appear to grow into voids, due probably to the asymmetry in the local environment surrounding the crystals.
- OSTI ID:
- 141085
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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