期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 4, 页码 3677-3685出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b14274
关键词
thermoelectric materials; graphene quantum dot; hybrid nanostructure; charged interface; phonon scattering
资金
- National Materials Genome Project [2016YFB0700600]
- Shenzhen Science and Technology Research Grant [ZDSY20130331145131323, CXZZ20120829172325895, JCYJ20120614150338154, JCYJ20150629144612861]
- China Postdoctoral Science Foundation [2016M600862]
Novel Bi2Te3/graphene quantum dots (Bi2Te3/GQDs) hybrid nanosheets with a unique structure that GQDs are homogeneously embedded in the Bi2Te3 nanosheet matrix have been synthesized by a simple solution-based synthesis strategy. A significantly reduced thermal conductivity and enhanced powder factor are observed in the Bi2Te3/GQDs hybrid nanosheets, which is ascribed to the optimized thermoelectric transport properties of the Bi2Te3/GQDs interface. Furthermore, by varying the size of the GQDs, the thermoelectric performance of Bi2Te3/GQDs hybrid nano structures could be further enhanced, which could be attributed to the optimization of the density and dispersion manner of the GQDs in the Bi2Te3 matrix. A maximum ZT of 0.55 is obtained at 425 K for the Bi2Te3/GQDs-20 nm, which is higher than that of Bi2Te3 without hybrid nanostrucure. This work provides insights for the structural design and synthesis of Bi2Te3-based hybrid thermoelectric materials, which will be important for future development of broadly functional material systems.
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