Journal
CHEMICAL PHYSICS LETTERS
Volume 340, Issue 3-4, Pages 242-248Publisher
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DOI: 10.1016/S0009-2614(01)00419-5
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Encapsulated and hollow closed-cage onion-like structures of WS2 and MoS2 were prepared by laser ablation of the corresponding layered structures in argon atmosphere at four varied temperatures. A detailed study for WS2 indicates that only metal-filled onion-like structures are produced at temperatures T less than or equal to 650 degreesC, whereas a mixture of metal-filled and hollow structures are produced at T greater than or equal to 850 degreesC. The encapsulated metal is identified to be predominantly the metastable beta phase of tungsten. Very short tube-like or elongated polyhedral structures are also obtained at high temperatures. (C) 2001 Published by Elsevier Science B.V.
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