Thermoelectric properties of nano-bulk bismuth telluride prepared with spark plasma sintered nano-plates
- Authors
- Ahn, Kyunghan; Won, Jong Kook; Kang, Yeo Kyung; Hwang, Chahwan; Chung, In; Kim, Myung-Gil
- Issue Date
- Feb-2019
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Thermoelectric; Bi2Te3; Nano-plate
- Citation
- CURRENT APPLIED PHYSICS, v.19, no.2, pp 97 - 101
- Pages
- 5
- Journal Title
- CURRENT APPLIED PHYSICS
- Volume
- 19
- Number
- 2
- Start Page
- 97
- End Page
- 101
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/18261
- DOI
- 10.1016/j.cap.2018.11.010
- ISSN
- 1567-1739
1878-1675
- Abstract
- The pursuit for a high-performance thermoelectric n-type bismuth telluride-based material is significant because n-type materials are inferior to their corresponding p-type materials in highly efficient thermoelectric modules. Herein, to improve the thermoelectric performance of an n-type Bi2Te3, we prepared Bi2Te3 nano-plates with a homogeneous sub-micron size distribution and thickness range of about a few tens of nanometers. This was achieved using a typical nano-chemical synthetic method, and the prepared materials were then spark plasma sintered to fabricate n-type nano-bulk Bi2Te3 samples. We observed a significant enhancement of the anisotropic electrical transport properties for the nano-bulk sample with a higher power factor along the in-plane direction (24.3 mu W cm(-1) K-2 at 300 K) than that along the out-of-plane direction (8.1 mu W cm(-1) K-2 at 300 K). However, thermal transport properties were insensitive along the measured direction for the nano-bulk sample. We used a dimensionless figure of merit ZT to calculate the thermoelectric performance. The results showed that the maximum ZT value of 0.69 was achieved along the in-plane direction at 440 K for the nano-bulk n-type Bi2Te3 sample, which was however smaller than that of the previously reported n-type samples (ZT of 1.1). We believe that a further enhancement of the ZT value in the fabricated nano-bulk sample could be accomplished by effectively removing the surface organic ligand of the Bi2Te3 nano-plate particles and optimizing the spark plasma sintering conditions, maintaining the nano-plate morphology intact.
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Collections - College of Natural Sciences > Department of Chemistry > 1. Journal Articles
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