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Synthesis and Optical Properties of 1D Bismuth Nanorods

Published online by Cambridge University Press:  01 February 2011

Jason Reppert ,
Sivaram Krishnan ,
Jian He ,
Rahul Rao ,
Terry Tritt  and
Apparao Rao
Jason Reppert
Affiliation:
jrepper@clemson.edu, Clemson University, Department of Physics and Astronomy, 118 Kinard Laboratory, Clemson University, Clemson, SC, 29634, United States
Sivaram Krishnan
Affiliation:
email2sivaram@gmail.com, Sri Sathya Sai University, Prasanthi Nilayam P.O., 515134, India
Jian He
Affiliation:
jianhe@clemson.edu, Clemson University, Department of Physics and Astronomy, Clemson, SC, 29634, United States
Rahul Rao
Affiliation:
rrao@clemson.edu, Clemson University, Department of Physics and Astronomy, Clemson, SC, 29634, United States
Terry Tritt
Affiliation:
ttritt@clemson.edu, Clemson University, Department of Physics and Astronomy, Clemson, SC, 29634, United States
Apparao Rao
Affiliation:
arao@clemson.edu, Clemson University, Department of Physics and Astronomy, Center for Optical Materials Science and Engineering Technology, Clemson, SC, 29634, United States
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Abstract

The presence of a high electron density of states in low-dimensional systems such as, nanowires and nanotubes, suggests that these 1D structures can be useful thermoelectric materials. Theoretical calculations predict that: (i) Semimetallic Bi nanowires exhibit semiconducting nature when their nanowire diameter is below 50 nm, and (ii) Semiconducting Bi nanowires with diameter < 10 nm are expected to have an enhanced figure of merit (ZT > 2), when Z=S2σ/κ (S: Seebeck coefficient, σ: electrical conductivity, and κ is the thermal conductivity). We report the synthesis of ∼10 nm diameter Bi nanorods using a pulsed laser vaporization method. The high resolution transmission electron microscopy images of our Bi nanorods show (i) crystalline <012> planes in the core of the nanorods, and (ii) coated with a thin amorphous Bi2O3 layer. The infrared absorption and the surface plasmon peaks in our Bi nanorods are blue-shifted in energy when compared to the corresponding spectra in bulk Bi.

Keywords

Biinfrared (IR) spectroscopyablation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1044: Symposium U – Thermoelectric Power Generation , 2007 , 1044-U03-06
Copyright
Copyright © Materials Research Society 2008

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