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Synthesis and Thermoelectric Properties of Bi2 S3 Nanobeads

Published online by Cambridge University Press:  01 February 2011

Jiye Fang
Affiliation:
Advanced Materials Research Institute, University of New Orleans, LA 70148 E-mail: jfang1@uno.edu
Feng Chen
Affiliation:
Advanced Materials Research Institute, University of New Orleans, LA 70148 E-mail: jfang1@uno.edu
Kevin L. Stokes
Affiliation:
Advanced Materials Research Institute, University of New Orleans, LA 70148 E-mail: jfang1@uno.edu
Jibao He
Affiliation:
Advanced Materials Research Institute, University of New Orleans, LA 70148 E-mail: jfang1@uno.edu
Jinke Tang
Affiliation:
Advanced Materials Research Institute, University of New Orleans, LA 70148 E-mail: jfang1@uno.edu
Charles J. O'Connor
Affiliation:
Advanced Materials Research Institute, University of New Orleans, LA 70148 E-mail: jfang1@uno.edu
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Abstract

Bismuth sulfide (Bi2S3), a direct band gap material with Eg ñ 1.3 eV, attracts high interest in thermoelectric investigations. In this work, nanometer-sized bismuth sulfide with unique morphology has been successfully prepared by a precipitation between bismuth 2-ethylhexanoate and thioacetamide in high-temperature organic solution with presence of proper capping/ stabilizing agents. By employing this technique, we are able to produce nanobeads of bismuth sulfide with an aspect ratio of ∼ 5, typically ~10 nm wide and ∼50 nm long according to the TEM observation. Characterization of XRD and TEM/HRTEM reveals that the as-prepared particles exist in single orthorhombic phase and possess high crystallinity. The composite ratio between Bi and S can be adjusted by varying the ratio between two precursors and was determined by using EDS (TEM) technique. Thermoelectric properties of these bismuth sulfide nanobeads were also investigated and will be discussed comparatively with those from commercial bulk materials.

Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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