Spatially resolving heterogeneous thermal conductivity of BiCuSeO based thermoelectric nanostructures via scanning thermal microscopy

被引:8
作者
Zhu, Qingfeng [1 ]
Liu, Junfu [2 ]
Lin, Yuanhua [2 ]
Xie, Shuhong [3 ]
Li, Jiangyu [1 ,4 ]
机构
[1] Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
[2] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[3] Xiangtan Univ, Sch Mat Sci & Engn, Xiangtan 411105, Hunan, Peoples R China
[4] Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen Key Lab Nanobiomech, Shenzhen 518055, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
REDUCED GRAPHENE OXIDE; PERFORMANCE; TRANSPORT; NANOWIRES;
D O I
10.1063/5.0023046
中图分类号
O59 [应用物理学];
学科分类号
摘要
Oxyselenide BiCuSeO is a promising thermoelectric material in the moderate temperature range, and nanostructuring is often adopted to enhance its thermoelectric properties. In these processes, secondary phases can be either induced inadvertently via doping or intentionally processed through nanocomposites, and their effects on local thermal transport remain unresolved from the experimental point of view. In this Letter, we take Pb-doped BiCuSeO and BiCuSeO embedded with rGO (BiCuSeO-rGO) as examples, and we reveal the effect of the secondary phase on local thermal conduction via quantitative scanning thermal microscopy in combination with finite element simulation. It is found that Pb-doping effectively reduces the thermal conductivity of BiCuSeO, while the rGO secondary phase slightly increases its thermal conductivity. Good quantitative agreement is observed between our nanoscale measurement and bulk values reported in the literature. Our work thus not only offers guidance for tuning the thermal transport properties of BiCuSeO but also provides an effective method to spatially resolve heterogenous thermal conductivity at the nanoscale.
引用
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页数:5
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