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

Zhu, Qingfeng1; Liu, Junfu2; Lin, Yuanhua2; Xie, Shuhong3; Li, Jiangyu1,4

2020-09-28

10.1063/5.0023046

APPLIED PHYSICS LETTERS   影响因子和分区

0003-6951

1077-3118

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.

SCI ; EI

英语

NI论文

第一 ; 通讯

National Key Research and Development Program of China[2016YFA0201001] ; National Natural Science Foundation of China[11627801][51772254] ; Leading Talents Program of Guangdong Province[2016LJ06C372] ; Key Area R&D Program of Guangdong Province[2018B010109009] ; Instrument Developing Project of the Chinese Academy of Sciences[ZDKYYQ20180004]

Physics

Physics, Applied

WOS:000576282300002

AMER INST PHYSICS

20204109335904

Thermoelectric equipment ; Nanotechnology ; Selenium compounds ; Copper compounds ; Lead compounds ; Thermal conductivity ; Thermoelectricity

Thermoelectric Energy:615.4 ; Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Nanotechnology:761

PHYSICS

Web of Science

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

Zhu, Qingfeng,Liu, Junfu,Lin, Yuanhua,et al. Spatially resolving heterogeneous thermal conductivity of BiCuSeO based thermoelectric nanostructures via scanning thermal microscopy[J]. APPLIED PHYSICS LETTERS,2020,117(13).

Zhu, Qingfeng,Liu, Junfu,Lin, Yuanhua,Xie, Shuhong,&Li, Jiangyu.(2020).Spatially resolving heterogeneous thermal conductivity of BiCuSeO based thermoelectric nanostructures via scanning thermal microscopy.APPLIED PHYSICS LETTERS,117(13).

Zhu, Qingfeng,et al."Spatially resolving heterogeneous thermal conductivity of BiCuSeO based thermoelectric nanostructures via scanning thermal microscopy".APPLIED PHYSICS LETTERS 117.13(2020).