Simultaneous increase in conductivity and phonon scattering in a graphene nanosheets/(Bi2Te3)0.2(Sb2Te3)0.8 thermoelectric nanocomposite

被引：69
作者：
Li, Cong [1 ]
Qin, Xiaoying [1 ]
Li, Yuanyue [1 ]
Li, Di [1 ]
Zhang, Jian [1 ]
Guo, Haifeng [1 ]
Xin, Hongxing [1 ]
Song, Chunjun [1 ]
机构：
[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 661卷
基金：
中国国家自然科学基金;
关键词：
Thermoelectric; BiSbTe; Phonon scattering; BISMUTH-ANTIMONY TELLURIDE; BISBTE-BASED COMPOSITES; DENSITY-OF-STATES; PERFORMANCE; MERIT; BI2TE3; FIGURE; TE; NANOSTRUCTURES; NANOPARTICLES;
D O I：
10.1016/j.jallcom.2015.11.217
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A thermoelectric nanocomposite of Bi0.4Sb1.6Te3 (BiSbTe) incorporated with the graphene nanosheets (GNs) has been synthesized and studied. The reduction of the carrier mobility is much less than the increase of the carrier concentration, resulting in the increase in conductivity at a low graphene nanosheets content. Simultaneously, graphene nanosheets causes 20-30% reduction in thermal conductivity (k) owing to phonons blocking of nanosheets as well as phase boundaries. As a result, high dimensionless figure of merit (ZT) values of up to 1.29 (300 K) and 1.54 (440 K) are obtained in Bi0.4Sb1.6Te3 incorporated with only 0.3 vol.% and 0.4 vol.% graphene nanosheets, respectively, demonstrating that the thermoelectric performance of the BiSbTe alloy can be improved effectively through incorporation of GNs. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：389 / 395
页数：7
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