title: Graphene Quantum Dots Embedded in Bi2Te3Nanosheets To Enhance Thermoelectric Performance.
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.
authors.affiliation: School of Advanced Materials, Peking University Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Shuankui
authors.initials: S
authors.lastname: Li
authors.affiliation: School of Advanced Materials, Peking University Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Tianju
authors.initials: T
authors.lastname: Fan
authors.affiliation: School of Advanced Materials, Peking University Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Xuerui
authors.initials: X
authors.lastname: Liu
authors.affiliation: College of Materials Science and Engineering, Shenzhen University and Shenzhen Key Laboratory of Special Functional Materials , Shenzhen 518060, China.
authors.forename: Fusheng
authors.initials: F
authors.lastname: Liu
authors.affiliation: School of Advanced Materials, Peking University Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Hong
authors.identifier: http://orcid.org/0000-0001-5877-359X
authors.initials: H
authors.lastname: Meng
authors.affiliation: School of Advanced Materials, Peking University Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Yidong
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Advanced Materials, Peking University Shenzhen Graduate School , Shenzhen 518055, China.
authors.forename: Feng
authors.identifier: http://orcid.org/0000-0002-8216-1339
authors.initials: F
authors.lastname: Pan
keywords: charged interface; graphene quantum dot; hybrid nanostructure; phonon scattering; thermoelectric materials