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Chalcogen Nanowires: Synthesis and Properties

Published online by Cambridge University Press:  15 February 2011

Brian T. Mayers and
Younan Xia
Brian T. Mayers
Affiliation:
Department of Chemistry, University of Washington, Seattle, WA 98195-1700, USA., xia@chem.washington.edu
Younan Xia
Affiliation:
Department of Chemistry, University of Washington, Seattle, WA 98195-1700, USA., xia@chem.washington.edu
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Abstract

We have demonstrated a variety of solution-phase approaches for the synthesis of 1- dimensional nanostructures from chalcogens such as Se and Te. These nanostructures include uniform, single crystalline nanowires and nanorods (lateral dimensions from 10 to 1000 nm, and lengths ranging from 2 to >100 νm). These nanostructures grew via a solid-solution-solid transformation mechanism, in which Se and Te atoms were transported from the less stable source (amorphous colloids) into the more stable product (trigonal phase nanocrystallites). The nanocrystallites (or seeds) were formed either through temperature driven homogeneous nucleation or by sonochemical cavitation. As directed by the highly anisotropic crystal structure, the growth could be confined to one particular direction. These nanowires could be prepared both as dispersions in various solvents or as networked arrays on solid supports.

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