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Proceedings Paper

Ultrasonication of bismuth telluride nanocrystals fabricated by solvothermal method
Author(s): Sang-Hyon Chu; Sang H. Choi; Jae-Woo Kim; Glen C. King; James R. Elliott
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Paper Abstract

The objective of this study is to evaluate the effect of ultrasonication on bismuth telluride nanocrystals prepared by solvothermal method. In this study, a low dimensional nanocrystal of bismuth telluride (Bi2Te3) was synthesized by a solvothermal process in an autoclave at 180°C and 200 psi. During the solvothermal reaction, organic surfactants effectively prevented unwanted aggregation of nanocrystals in a selected solvent while controlling the shape of the nanocrystal. The atomic ratio of bismuth and tellurium was determined by energy dispersive spectroscopy (EDS). The cavitational energy created by the ultrasonic probe was varied by the ultrasonication process time, while power amplitude remained constant. The nanocrystal size and its size distribution were measured by field emission scanning electron microscopy (FESEM) and a dynamic light scattering system. When the ultrasonication time increased, the average size of bismuth telluride nanocrystal gradually increased due to the direct collision of nanocrystals. The polydispersity of the nanocrystals showed a minimum when the ultrasonication was applied for 5 min.

Paper Details

Date Published: 31 March 2006
PDF: 8 pages
Proc. SPIE 6172, Smart Structures and Materials 2006: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, 61720A (31 March 2006); doi: 10.1117/12.658071
Show Author Affiliations
Sang-Hyon Chu, National Institute of Aerospace (United States)
Sang H. Choi, NASA Langley Research Ctr. (United States)
Jae-Woo Kim, Science and Technology Corp. (United States)
Glen C. King, NASA Langley Research Ctr. (United States)
James R. Elliott, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 6172:
Smart Structures and Materials 2006: Smart Electronics, MEMS, BioMEMS, and Nanotechnology
Vijay K. Varadan, Editor(s)

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