Vertically Aligned Silicon Carbide Nanowires/Boron Nitride Cellulose Aerogel Networks Enhanced Thermal Conductivity and Electromagnetic Absorbing of Epoxy Composites

• Published in: Nano-micro letters Vol. 14; no. 1; pp. 118 - 19
• Main Authors: Pan, Duo, Yang, Gui, Abo-Dief, Hala M., Dong, Jingwen, Su, Fengmei, Liu, Chuntai, Li, Yifan, Bin Xu, Ben, Murugadoss, Vignesh, Naik, Nithesh, El-Bahy, Salah M., El-Bahy, Zeinhom M., Huang, Minan, Guo, Zhanhu
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.12.2022; Springer Nature B.V; SpringerOpen
• Subjects: Absorption; Aerogels; Boron nitride; Cellulose; Composite materials; Displays; Electrical resistivity; Electromagnetic radiation; Electronic packaging; Engineering; Epoxy; Fillers; Heat conductivity; Heat transfer; Horizontal orientation; Ice template; Microelectronics; Multifunctionality; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Nanowires; Silicon carbide; Special issue on EM Wave Functional Materials; Thermal conductivity; Vertical alignment; Thermal conductivity; Vertical alignment; Multifunctionality; Ice template; Epoxy
• ISSN: 2311-6706; 2150-5551; 2150-5551
• DOI: 10.1007/s40820-022-00863-z

Highlights Cellulose aerogel with vertically oriented structure was obtained by constructing a vertically aligned SiC nanowires/BN network via the ice template assisted strategy. The thermal conductivity of the composite in the vertical direction reaches 2.21 W m −1 K −1 at a low hybrid filler loading of 16.69 wt%, which was increased 890% compared to pure epoxy. The composite exhibits good electrically insulating with a volume electrical resistivity about 2.35×10 11  Ω cm, and displays excellent electromagnetic wave absorption performance. With the innovation of microelectronics technology, the heat dissipation problem inside the device will face a severe test. In this work, cellulose aerogel (CA) with highly enhanced thermal conductivity (TC) in vertical planes was successfully obtained by constructing a vertically aligned silicon carbide nanowires (SiC NWs)/boron nitride (BN) network via the ice template-assisted strategy. The unique network structure of SiC NWs connected to BN ensures that the TC of the composite in the vertical direction reaches 2.21 W m −1  K −1 at a low hybrid filler loading of 16.69 wt%, which was increased by 890% compared to pure epoxy (EP). In addition, relying on unique porous network structure of CA, EP-based composite also showed higher TC than other comparative samples in the horizontal direction. Meanwhile, the composite exhibits good electrically insulating with a volume electrical resistivity about 2.35 × 10 11 Ω cm and displays excellent electromagnetic wave absorption performance with a minimum reflection loss of − 21.5 dB and a wide effective absorption bandwidth (< − 10 dB) from 8.8 to 11.6 GHz. Therefore, this work provides a new strategy for manufacturing polymer-based composites with excellent multifunctional performances in microelectronic packaging applications.