The efficacy of light-emitting diode cooling is anomalously augmented by deploying nucleate boiling on graphene-nanoplatelets coated surface at sub-atmospheric pressures. The thermal curing process makes the intrinsically hydrophobic graphene-nanoplatelets superhydrophilic. Nucleate boiling is significantly enhanced due to the ultrafast water permeation property of the cured superhydrophilic graphene-nanoplatelets. The ultrafast transport of water molecules through the nanostructures of graphene-nanoplatelets forms an ultrathin film of water that prompt effective absorption of latent heat of vaporization. Concurrent with the nanoporous structure of graphene-nanoplatelets, the nucleate boiling performance is significantly augmented due to the pronounced enhancement in the nucleation, growth, and departure rates of vapor bubbles. By benchmarking with the uncoated surface, the superhydrophilic graphene-nanoplatelets coated surface achieves a maximum enhancement in boiling heat transfer coefficient of 1178%, with a drastic temperature drop of 15.5 °C on the light-emitting diode surface. This translates into a substantially prolonged lifespan of the light-emitting diode. This study provides insightful information on the application of graphene coatings for a highly efficient and passive microelectronics cooling device.

通过在亚大气压下在石墨烯-纳米片涂层表面上部署核沸腾，发光二极管冷却的功效异常增强。热固化过程使本质上疏水的石墨烯-纳米片具有超亲水性。由于固化的超亲水石墨烯-纳米片的超快水渗透特性，核沸腾显着增强。水分子通过石墨烯纳米片的纳米结构的超快传输形成了水的超薄膜，促进了蒸发潜热的有效吸收。与石墨烯-纳米片的纳米多孔结构同时，由于蒸汽泡的成核、生长和离开速率的显着增强，核沸腾性能显着增强。通过以未涂层表面为基准，超亲水石墨烯-纳米片涂层表面的沸腾传热系数最大提高了 1178%，发光二极管表面的温度急剧下降了 15.5°C。这转化为发光二极管的显着延长的寿命。这项研究提供了有关石墨烯涂层在高效无源微电子冷却设备中的应用的深刻信息。