Issue 25, 2011
From the journal:

Journal of Materials Chemistry

Control of anisotropic electrical transport property of Bi2S3 thermoelectric polycrystals

Zhen-Hua Ge,a   Bo-Ping Zhang,*a   Peng-Peng Shanga  and  Jing-Feng Lib  

* Corresponding authors

a Beijing Key Lab of New Energy Materials and Technology, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
E-mail: bpzhang@ustb.edu.cn
Tel: +86-10-62334195

b State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Abstract

After fabricating Bi2S3 nanorods with preferential (001) orientation by hydrothermal synthesis (HS) using Bi(NO3)3 and Na2S2O3 as raw materials and ethylenediamine (EDA) as a pH modifier, Bi2S3 bulk materials were consolidated by spark plasma sintering (SPS). A single-phase, rod-like Bi2S3 crystal with a length in range of 2–10 μm and a diameter in range of 100–400 nm was formed by optimizing the hydrothermal process parameters. The rod-like structures were maintained in the Bi2S3 bulk, and as a result the orientation degree of the bulk sample prepared from Bi2S3 nanorods powders reached 0.69, being higher than 0.18 found for mechanical alloying (MA)-derived powder. The measurement of electric transport properties also confirmed that the Bi2S3 bulk has obvious anisotropy. The electric resistivity normal to the pressing direction is one order higher than that in parallel to the pressing direction due to their anisotropic orientation. The power factor of the bulk sample along the direction perpendicular to the pressing direction is twice higher than that in parallel to the pressing direction, and also higher than the sample using the MA-processed powders.

Graphical abstract: Control of anisotropic electrical transport property of Bi2S3 thermoelectric polycrystals

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Article information

DOI
https://doi.org/10.1039/C1JM11069A
Article type
Paper
Submitted
11 Mar 2011
Accepted
18 Apr 2011
First published
27 May 2011

J. Mater. Chem., 2011,21, 9194-9200

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Control of anisotropic electrical transport property of Bi2S3 thermoelectric polycrystals

Z. Ge, B. Zhang, P. Shang and J. Li, J. Mater. Chem., 2011, 21, 9194 DOI: 10.1039/C1JM11069A

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