Graphene Quantum Dots Embedded in Bi2Te3 Nanosheets To Enhance Thermoelectric Performance
- 20 January 2017
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 9 (4), 3677-3685
- https://doi.org/10.1021/acsami.6b14274
Abstract
Novel Bi2Te3/graphene quantum dots (Bi2Te3/GQDs) hybrid nanosheets with a unique structure that GQDs are homogeneously embedded in the Bi2Te3nanosheet 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 nanostructures could be further enhanced, which could be attributed to the optimization of the density and dispersion manner of the GQDs in the Bi2Te3matrix. A maximum ZT of 0.55 is obtained at 425 K for the Bi2Te3/GQDs-20 nm, which is higher than that of Bi2Te3without 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. © 2017 American Chemical Society.Keywords
Funding Information
- Ministry of Science and Technology of the People's Republic of China (2016YFB0700600)
- China Postdoctoral Science Foundation (2016M600862)
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