Simoncini Alessandro, Tagliaferri Vincenzo, Ucciardello Nadia
Department of Enterprise Engineering "Mario Lucertini", University of Rome "Tor Vergata", Via del Politecnico 1, 00133 Rome, Italy.
Materials (Basel). 2017 Oct 25;10(11):1226. doi: 10.3390/ma10111226.
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·K (+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.
通过电沉积成功制备了铜基中具有高度取向石墨纳米片的纳米复合涂层。首次对纳米填料的分布和热导率进行了评估。通过偏振显微拉曼光谱对填充材料的取向度和倾斜度进行了定量评估。根据拉曼G峰频率对激光功率激发的依赖性，提取了石墨纳米片的室温热导率值。还测量了G峰位移的温度依赖性。最值得注意的是，通过闪光法测得复合涂层的整体热导率为640±20W·m·K（比铜高57%）。我们的实验结果由一个有效介质近似（EMA）模型来解释，该模型考虑了铜基体内填料几何形状、取向和热导率的影响。
