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Materials 2016, 9(8), 638; doi:10.3390/ma9080638

Microstructure and Electrical Properties of AZO/Graphene Nanosheets Fabricated by Spark Plasma Sintering

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA
Author to whom correspondence should be addressed.
Academic Editor: Eugene A. Olevsky
Received: 12 May 2016 / Revised: 17 June 2016 / Accepted: 20 July 2016 / Published: 29 July 2016
View Full-Text   |   Download PDF [5261 KB, uploaded 29 July 2016]   |  


In this study we report on the sintering behavior, microstructure and electrical properties of Al-doped ZnO ceramics containing 0–0.2 wt. % graphene sheets (AZO-GNSs) and processed using spark plasma sintering (SPS). Our results show that the addition of <0.25 wt. % GNSs enhances both the relative density and the electrical resistivity of AZO ceramics. In terms of the microstructure, the GNSs are distributed at grain boundaries. In addition, the GNSs are also present between ZnO and secondary phases (e.g., ZnAl2O4) and likely contribute to the measured enhancement of Hall mobility (up to 105.1 cm2·V−1·s−1) in these AZO ceramics. The minimum resistivity of the AZO-GNS composite ceramics is 3.1 × 10−4 Ω·cm which compares favorably to the value of AZO ceramics which typically have a resistivity of 1.7 × 10−3 Ω·cm. View Full-Text
Keywords: graphene nanosheets; Al-doped-ZnO; electrical properties; spark plasma sintering graphene nanosheets; Al-doped-ZnO; electrical properties; spark plasma sintering

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yang, S.; Chen, F.; Shen, Q.; Lavernia, E.J.; Zhang, L. Microstructure and Electrical Properties of AZO/Graphene Nanosheets Fabricated by Spark Plasma Sintering. Materials 2016, 9, 638.

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