A Through‐Thickness Arrayed Carbon Fibers Elastomer with Horizontal Segregated Magnetic Network for Highly Efficient Thermal Management and Electromagnetic Wave Absorption. Issue 4 (27th November 2022)

• Record Type: Journal Article
• Authors: Zhang, Zhen; Wang, Jianda; Shang, Jian; Xu, Yadong; Wan, Yan‐Jun; Lin, Zhiqiang; Sun, Rong; Hu, Yougen
• Is Part Of: Small. Volume 19:Issue 4(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-27
• Subjects: aligned carbon fiber arrays -- density functional calculation -- electromagnetic wave absorption -- finite element analysis -- thermal interface materials -- thermal management; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202205716
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Multifunctional thermal management materials with highly efficient electromagnetic wave (EMW) absorption performance are urgently required to tackle the heat dissipation and electromagnetic interference issues of high integrated electronics. However, the high thermal conductivity (λ) and outstanding EMW absorption performance are often incompatible with each other in a single material. Herein, a through‐thickness arrayed NiCo2 O4 /graphene oxide/carbon fibers (NiCO@CFs) elastomer with integrated functionalities of high thermal conductivity, highly efficient EMW absorption, and excellent compressibility is reported. The NiCO@CFs elastomer realizes a high out‐of‐plane thermal conductivity of 15.55 W m −1 K −1, due to the through‐thickness vertically aligned CFs framework. Moreover, the unique horizontal segregated magnetic network effectively reduces the electrical contact between the CFs, which significantly enhances impedance matching of NiCO@CFs elastomer. As a result, the vertically arrayed NiCO@CFs elastomer synchronously exhibits ultrabroad effective absorption bandwidth of 8.25 GHz (9.75–18 GHz) at a thickness of 2.4 mm, good impedance matching, and a minimum reflection loss (RLmin ) of −55.15 dB. Given these outstanding findings, the multifunctional arrayed NiCO@CFs elastomer opens an avenue for applications in EMW absorption and thermal management. This strategy of constructing thermal/electrical/mechanical pathways provides a promising way for the high‐performance multifunctional materials in electronic devices. Abstract : A novel strategy of constructing a through‐thickness array pathway segregated by horizontal magnetic network is proposed to reconcile the conflict between high thermal conductivity and high electromagnetic wave absorption performance within one material. Such an original strategy avoids trade‐off between the functional components and maximizing the performance of multifunctions.