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Electrical Conductivity of Graphene Composites with In and In-Ga Alloy

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Abstract

Samples of composites of graphene with indium or indium-gallium alloy as the matrix were prepared by a process of spreading exfoliated graphene oxide on the foils, repeatedly folding and rolling. The foils were intermittently annealed and the process repeated by addition of more graphene oxide. Indium flux was used to remove any indium or gallium oxide. The samples were characterized by x-ray diffraction, and optical and scanning electron microscopy (SEM). Electrical resistivity and temperature coefficient of resistance (TCR) were measured using a four-probe method in the temperature range of 260 K to 340 K, and the results were used to determine the volume fraction of graphene from effective mean-field analysis. The volume fraction of graphene remained between 0.11 and 0.14 in samples of In with graphene and between 0.12 and 0.13 in samples of In-Ga with graphene. The results indicate that the electrical resistivity and the TCR of the composite were reduced by the addition of graphene. The resistivity of graphene remained between 1.19 × 10−6 ohm cm and 1.87 × 10−6 ohm cm in all samples and was thus almost independent of the matrix composition. The electrical resistivity of graphene was found to be an order of magnitude smaller than that of indium or the indium-gallium alloy.

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  1. Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695-7907, USA

    A. Naga Sruti & K. Jagannadham

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  1. A. Naga Sruti
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  2. K. Jagannadham
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Correspondence to K. Jagannadham.

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Sruti, A.N., Jagannadham, K. Electrical Conductivity of Graphene Composites with In and In-Ga Alloy. J. Electron. Mater. 39, 1268–1276 (2010). https://doi.org/10.1007/s11664-010-1208-2

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  • DOI: https://doi.org/10.1007/s11664-010-1208-2

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