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Synthesis and Characterization of Bismuth Sulfide and Bismuth Telluride Nanorods and their Polyaniline Nanocomposites

Published online by Cambridge University Press:  01 February 2011

Ven B. Reddy ,
Patrick L. Garrity  and
Kevin L. Stokes
Ven B. Reddy
Affiliation:
Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148.
Patrick L. Garrity
Affiliation:
Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148.
Kevin L. Stokes
Affiliation:
Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148.
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Extract

We present here a simplified approach to the synthesis of bismuth sulfide and bismuth telluride nanorods and their polyaniline(PAN)-coated nanocomposites. The present method gives highly crystalline nanorods of bismuth sulfide of varying aspect ratio depending on the capping ligand employed, and involves reacting bismuth(III) trioleate with thioacetamide in phenyl ether at elevated temperatures in the presence of excess capping ligand. Bismuth telluride was obtained in high yields by reacting bismuth(III) trioleate with trioctylphosphine telluride at relatively low temperature. Oleic acid, sodium dodecylsulfonate and sodium dodecylbenzene sulfonate, used as capping ligands, did not have significant effect on the aspect ratio of Bi2Te3 nanorods. The nanostructured materials obtained this way were then coated with polyaniline (PAN) by heating a specific amount of material with half as much PAN in toluene close to reflux temperature for 6–8 h. It was necessary to keep the mixture thoroughly stirred and intermittently sonicated in order to ensure that the particles remain dispersed at all times. Bismuth chalcogenide nanoparticles as well as their composites were characterized using transmission electron microscopy and X-ray powder diffraction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 793: Symposium S – Thermoelectric Materials 2003 - Research and Applications , 2003 , S8.36
Copyright
Copyright © Materials Research Society 2004

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