Silvestri Cinzia, Riccio Michele, Poelma René H, Jovic Aleksandar, Morana Bruno, Vollebregt Sten, Irace Andrea, Zhang Guo Qi, Sarro Pasqualina M
Department of Microelectronics, Delft University of Technology, Feldmannweg 17, 2628CT, Delft, The Netherlands.
Department of Electrical Engineering and Information Technologies, University of Naples Federico II, Via Claudio 21, 80125, Naples, Italy.
Small. 2018 May;14(20):e1800614. doi: 10.1002/smll.201800614. Epub 2018 Apr 17.
The high aspect ratio and the porous nature of spatially oriented forest-like carbon nanotube (CNT) structures represent a unique opportunity to engineer a novel class of nanoscale assemblies. By combining CNTs and conformal coatings, a 3D lightweight scaffold with tailored behavior can be achieved. The effect of nanoscale coatings, aluminum oxide (Al O ) and nonstoichiometric amorphous silicon carbide (a-SiC), on the thermal transport efficiency of high aspect ratio vertically aligned CNTs, is reported herein. The thermal performance of the CNT-based nanostructure strongly depends on the achieved porosity, the coating material and its infiltration within the nanotube network. An unprecedented enhancement in terms of effective thermal conductivity in a-SiC coated CNTs has been obtained: 181% compared to the as-grown CNTs and Al O coated CNTs. Furthermore, the integration of coated high aspect ratio CNTs in an epoxy molding compound demonstrates that, next to the required thermal conductivity, the mechanical compliance for thermal interface applications can also be achieved through coating infiltration into foam-like CNT forests.
空间取向的类森林状碳纳米管（CNT）结构的高纵横比和多孔性质为设计一类新型纳米级组件提供了独特契机。通过将碳纳米管与保形涂层相结合，可以实现具有定制性能的三维轻质支架。本文报道了纳米级涂层，即氧化铝（Al₂O₃）和非化学计量比的非晶碳化硅（a-SiC），对高纵横比垂直排列碳纳米管热传输效率的影响。基于碳纳米管的纳米结构的热性能在很大程度上取决于所实现的孔隙率、涂层材料及其在纳米管网络中的渗透情况。在涂覆a-SiC的碳纳米管中，有效热导率得到了前所未有的提高：与生长态碳纳米管和涂覆Al₂O₃的碳纳米管相比，提高了181%。此外，将涂覆的高纵横比碳纳米管集成到环氧模塑料中表明，除了所需的热导率外，通过涂层渗透到泡沫状碳纳米管森林中，还可以实现热界面应用所需的机械柔顺性。
