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Crystals 2017, 7(3), 71;

Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites

School of Materials Science and Engineering, University of Jinan, Jinan 250022, China
Author to whom correspondence should be addressed.
Academic Editor: George S. Nolas
Received: 28 January 2017 / Revised: 26 February 2017 / Accepted: 27 February 2017 / Published: 28 February 2017
(This article belongs to the Special Issue Materials Processing and Crystal Growth for Thermoelectrics)
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Cu2SnSe3 material is regarded as a potential thermoelectric material due to its relatively high carrier mobility and low thermal conductivity. In this study, graphene was introduced into the Cu2SnSe3 powder by ball milling, and the bulk graphene/Cu2SnSe3 thermoelectric composites were prepared by spark plasma sintering. The graphene nanosheets distributed uniformly in the Cu2SnSe3 matrix. Meanwhile, some graphene nanosheets tended to form thick aggregations, and the average length of these aggregations was about 3 μm. With the fraction of graphene increasing, the electrical conductivity of graphene/Cu2SnSe3 samples increased greatly while the Seebeck coefficient was decreased. The introduction of graphene nanosheets can reduce the thermal conductivity effectively resulting from the phonon scattering by the graphene interface. When the content of graphene exceeds a certain value, the thermal conductivity of graphene/Cu2SnSe3 composites starts to increase. The achieved highest figure of merit (ZT) for 0.25 vol % graphene/Cu2SnSe3 composite was 0.44 at 700 K. View Full-Text
Keywords: thermoelectric; composites; ternary diamond-like semiconductor; graphene thermoelectric; composites; ternary diamond-like semiconductor; graphene

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Zhao, D.; Wang, X.; Wu, D. Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites. Crystals 2017, 7, 71.

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