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In-situ TEM Study of Bismuth Nanostructures

Published online by Cambridge University Press:  01 February 2011

Xiaoting Jia
Affiliation:
xjia@mit.edu, MIT, Material Sciences and Engineering, 77 Massachusetts avenue room 13-3021, Cambridge, MA, 02139, United States
Vincent Berube
Affiliation:
vberube@mit.edu, MIT, Physics, Cambridge, MA, 02139, United States
Shuo Chen
Affiliation:
chens@mit.edu, MIT, Mechanical Engineering, Cambridge, MA, 02139, United States
Bed Poudel
Affiliation:
poudel@bc.edu, Boston College, Physics, Chestnut Hill, MA, 02467, United States
Son Hyungbin
Affiliation:
being@mit.edu, MIT, Electrical Engineering and Computer Science, Cambridge, MA, 02139, United States
Jing Kong
Affiliation:
jingkong@mit.edu, MIT, Electrical Engineering and Computer Science, Cambridge, MA, 02139, United States
Yang Shao-Horn
Affiliation:
shaohorn@mit.edu, MIT, Mechanical Engineering, Cambridge, MA, 02139, United States
Ren Zhifeng
Affiliation:
renzh@bc.edu, Boston College, Physics, Chestnut Hill, MA, 02467, United States
Gang Chen
Affiliation:
gchen2@mit.edu, MIT, Mechanical Engineering, Cambridge, MA, 02139, United States
Mildred S Dresselhaus
Affiliation:
millie@mgm.mit.edu, MIT, Physics, Cambridge, MA, 02139, United States
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Abstract

Nanostructured thermoelectric materials have attracted lots of interest in recent years, due to their enhanced performance determined by their thermoelectric dimensionless figure of merit. However, because of equipment limitations, not much work has been done on combining simultaneous transport measurements and structural characterization on individual nanostructured thermoelectric materials. With an integrated TEM-STM system, we studied the structural behavior and electrical properties of bismuth (Bi) nanobelts and nanoparticles. Results showed that clean Bi nanostructures free of oxides can be produced by in-situ high temperature electro-migration and Joule annealing processes occurring within the electron microscope. Preliminary electrical measurements indicate a conductivity of two orders of magnitude lower for Bi nanoparticles than that for bulk Bi. Such in-situ studies are highly advantageous for studying the semimetal-semiconductor transition and how this transition could enhance thermoelectric properties.

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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