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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

1
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
2
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
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Abstract

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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MDPI and ACS Style

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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