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Graphene Quantum Dots Embedded in Bi 2 Te 3 Nanosheets To Enhance Thermoelectric Performance.
ACS Applied Materials & Interfaces 2017 Februrary 2
Novel Bi2 Te3 /graphene quantum dots (Bi2 Te3 /GQDs) hybrid nanosheets with a unique structure that GQDs are homogeneously embedded in the Bi2 Te3 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 Bi2 Te3 /GQDs hybrid nanosheets, which is ascribed to the optimized thermoelectric transport properties of the Bi2 Te3 /GQDs interface. Furthermore, by varying the size of the GQDs, the thermoelectric performance of Bi2 Te3 /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 Bi2 Te3 matrix. A maximum ZT of 0.55 is obtained at 425 K for the Bi2 Te3 /GQDs-20 nm, which is higher than that of Bi2 Te3 without hybrid nanostrucure. This work provides insights for the structural design and synthesis of Bi2 Te3 -based hybrid thermoelectric materials, which will be important for future development of broadly functional material systems.
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