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Science 13 January 1995:
Vol. 267. no. 5195, pp. 222 - 225
DOI: 10.1126/science.267.5195.222
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Articles

High-Rate, Gas-Phase Growth of MoS2 Nested Inorganic Fullerenes and Nanotubes

Y. Feldman 1, E. Wasserman 2, D. J. Srolovitz 3, and R. Tenne 1

1 Department of Materials and Interfaces, Weizmann Institute, Rehovot 76100, Israel
2 Central Research and Development Laboratories, E. I. du Pont de Nemours, Experimental Station, Wilmington, DE 19898, USA.
3 Department of Materials and Interfaces, Weizmann Institute, Rehovot 76100, Israel, and Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA

The gas-phase reaction between MoO3-x and H2S in a reducing atmosphere at elevated temperatures (800° to 950°C) has been used to synthesize large quantities of an almost pure nested inorganic fullerene (IF) phase of MoS2. A uniform IF phase with a relatively narrow size distribution was obtained. The synthesis of IFs appears to require, in addition to careful control over the growth conditions, a specific turbulent flow regime. The x-ray spectra of the different samples show that, as the average size of the IF decreases, the van der Waals gap along the c axis increases, largely because of the strain involved in folding of the lamella. Large quantities of quite uniform nanotubes were obtained under modified preparation conditions.

Submitted on August 23, 1994
Accepted on October 31, 1994


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