Facile One-Step Fabrication of Multilayer Nanocomposite Coating for Radiative Heat Dissipation

To enhance the radiative heat dissipation in thermal management of electronic and optical devices, a novel structural nanocomposite coating was fabricated via facile one-step liquid-phase plasma assisted electrophoresis and sintering (LPES) technique. The results indicate that the larger amount of SiC addition in the electrolyte results in more nanoparticles being incorporated into the coating. When the concentration increased to 8 g/L, the saltation of that formation of a multilayer structure occurred for the nanocomposite coating. According to transmission electron microscopy, scanning electron microscopy, glow discharge optical emission spectroscopy, and energy dispersive spectroscopy results, a speculated mechanism model was proposed to reveal the LPES process. Furthermore, the nanocomposite coating improved the emissivity value, especially in the range of 3–8 μm, where the value was up to 0.86. Compared with the bare aluminum substrate, the coating formed with 8 g/L SiC addition enables the temperature drop by 10.0 and 15.8 °C for 1 and 5 W power LED, which yields the highest cooling efficiency of 19.1% and 21.0%, respectively. The simple and scalable nanocomposite coating fabrication approach by one-step LPES method exhibits excellent passive heat dissipation performance, which has potential applications in large power radiators of the electronic industry.