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Journal of Nanomaterials
Volume 2017, Article ID 4308968, 5 pages
https://doi.org/10.1155/2017/4308968
Research Article

Thermoelectric Properties of a Single Crystalline Ag2Te Nanowire

1Department of Physics, Sogang University, Seoul 04107, Republic of Korea
2Center for Materials Genome, Korea Research Institute of Standard Science, Daejeon 34113, Republic of Korea

Correspondence should be addressed to Myung-Hwa Jung; rk.ca.gnagos@gnujhm

Received 15 February 2017; Accepted 11 May 2017; Published 31 May 2017

Academic Editor: Christian Brosseau

Copyright © 2017 Sunghun Lee et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Silver chalcogenides have received much attention in potential thermoelectric materials research because of high carrier mobility and low effective mass. Among them, in Ag2Te, it was reported that the phase transition from monoclinic to cubic phase occurs at relatively low temperatures, so that extensive research for effective application using this material has been aroused. In this work, we investigated how 1-dimensional nanostructure affects the thermoelectric properties through as-synthesized single crystalline Ag2Te nanowires. Adopting well-defined thermoelectric MEMS device structure and transferring an individual Ag2Te nanowire, we measure electrical resistance and Seebeck coefficient as a function of temperature. When the phase changes from monoclinic to cubic, the resistance increases, while absolute Seebeck coefficient value decreases. These results are compared with previous reports for Ag2Te bulk and film, suggesting the increased density of states of the carriers due to nanowire structure.