Abstract
Nanocomposite coatings with highly-aligned graphite nanoplatelets in a copper matrix were successfully fabricated by electrodeposition. For the first time, the disposition and thermal conductivity of the nanofiller has been evaluated. The degree of alignment and inclination of the filling materials has been quantitatively evaluated by polarized micro-Raman spectroscopy. The room temperature values of the thermal conductivity were extracted for the graphite nanoplatelets by the dependence of the Raman G-peak frequency on the laser power excitation. Temperature dependency of the G-peak shift has been also measured. Most remarkable is the global thermal conductivity of 640 ± 20 W·m−1·K−1 (+57% of copper) obtained for the composite coating by the flash method. Our experimental results are accounted for by an effective medium approximation (EMA) model that considers the influence of filler geometry, orientation, and thermal conductivity inside a copper matrix.
Highlights
Electronics have been the major growth sector in the world economy over the past two decades.To sustain this growth, modern electronics need better cooling technologies to compensate their increasing power densities, along with weight and size reductions [1]
The through-plane heat thermal conduction (HTC) obtained for the metal matrix composite coatings (MMCCs) was of 640 ± 20 W·m−1 ·K−1, while the one obtained for the pure copper coating was of 400 ± 21 W·m−1 ·K−1 Despite other methods where adding highly-conductive carbon nanomaterials the thermal conduction decreased, the use of an electrochemically-controlled method has allowed an improvement of k up to 57% compared to pure copper
For the first time, the thermal conductivity of the composite coating starting from the nanofillers
Summary
Electronics have been the major growth sector in the world economy over the past two decades. Firkowska et al [21] used the GnPs size to control the alignment and thermal conductivity in copper matrix composites, showing that the alignment is inseparably linked to the lateral size of the nanoplatelets This relationship resulted in anisotropic thermal properties of the composites, with a thermal conductivity along the flake alignment direction up to five times higher than perpendicular to it. In this context, electrochemical processes allow the realization of metal matrix composite coatings (MMCCs) with a better control of the alignment and inclination of the nanofillers, combined with excellent dispersion. Electrochemical processes allow the realization of metal matrix composite coatings (MMCCs) with a better control of the alignment and inclination of the nanofillers, combined with excellent dispersion The resulting composite coating has a superior thermal conductivity of 640 ± 20 W·m−1 ·K−1 evaluated by the flash method, which is in excellent agreement with modeling based on the effective medium approximation (EMA)
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