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ISRN Ceramics
Volume 2012 (2012), Article ID 839612, 6 pages
http://dx.doi.org/10.5402/2012/839612
Research Article

Chemical Synthesis and Properties of Novel Nanostructures and Microplatelets

1Department of Physics, University of Botswana, Private Bag UB 0022 Gaborone, Botswana
2African Materials Science and Engineering Network (AMSEN), A Carnegie IAS-RISE Network, UB Node, Private Bag UB 0022 Gaborone, Botswana

Received 2 August 2012; Accepted 29 August 2012

Academic Editors: S.-S. Lin, K. Yamashita, and K. Zupan

Copyright © 2012 Cosmas M. Muiva et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Bi2Se3 nanostructures, microsised fibre bundles, and platelets have been synthesised through a simple chemical spray pyrolysis route on glass substrates. Low substrate temperatures ( ) favoured growth of nanostructures while elevated was accompanied by increased grain growth and formation of microsised platelets. The nanostructures were identified as nanorods, nanofibers, nanotubes, nanoflowers, and nanoneedles of various aspect ratios. There was an observed red shift of the optical band gap ( ) with increased from 2.40 eV at 95°C to 1.25 eV at 360°C. Thermo probe measurements confirmed n-type conductivity with dark resistivities which followed a near exponential decline with elevated . The observed changes in optoelectronic properties existing in the different regimes were explained on the basis of microstructural and textural changes in the pristine clusters.