Abstract
A facile approach was developed in this study to align the magnetically functionalized graphene nanosheets (M-GNSs) within an epoxy matrix. M-GNSs were firstly synthesized by a modified polyol method with surface modification of Fe3O4 nanoparticles, and then incorporated into epoxy under an externally applied magnetic field. The alignment-dependent thermal conductivity of the M-GNSs/epoxy composite treated with various intensities of magnetic field in the range of 0–1.0 T was examined. Both the good dispersion and high alignment were found in the composites treated above 0.5 T of magnetic field, as verified by the x-ray diffraction and polarized Raman spectra. Thermal conductivity in the aligned direction of 0.5 T-treated composites with 0.52 vol.% filler content (0.361 ± 0.018 W/mK) showed enhancements of 111 ± 28% and 48 ± 16%, compared to that of epoxy (0.174 ± 0.014 W/mK) and non-magnetically treated composites (0.252 ± 0.019 W/mK), respectively.
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This work was financially supported by the Key Disciplines Fund of Shaanxi Province (080503) and the Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices (ZSKJ201314).
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Yan, H., Wang, R., Li, Y. et al. Thermal Conductivity of Magnetically Aligned Graphene–Polymer Composites with Fe3O4-Decorated Graphene Nanosheets. J. Electron. Mater. 44, 658–666 (2015). https://doi.org/10.1007/s11664-014-3561-z
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DOI: https://doi.org/10.1007/s11664-014-3561-z