Excellent Low-Frequency Microwave Absorption and High Thermal Conductivity in Polydimethylsiloxane Composites Endowed by Hydrangea-Like CoNi@BN Heterostructure Fillers

Mukun He, Xiao Zhong, Xinghan Lu, Jinwen Hu, Kunpeng Ruan, Hua Guo, Yali Zhang, Yongqiang Guo, Junwei Gu

Research output: Contribution to journalArticlepeer-review

146 Scopus citations

Abstract

The advancement of thin, lightweight, and high-power electronic devices has increasingly exacerbated issues related to electromagnetic interference and heat accumulation. To address these challenges, a spray-drying-sintering process is employed to assemble chain-like CoNi and flake boron nitride (BN) into hydrangea-like CoNi@BN heterostructure fillers. These fillers are then composited with polydimethylsiloxane (PDMS) to develop CoNi@BN/PDMS composites, which integrate low-frequency microwave absorption and thermal conductivity. When the volume fraction of CoNi@BN is 44 vol% and the mass ratio of CoNi to BN is 3:1, the CoNi@BN/PDMS composites exhibit optimal performance in both low-frequency microwave absorption and thermal conductivity. These composites achieve a minimum reflection loss of −49.9 dB and a low-frequency effective absorption bandwidth of 2.40 GHz (3.92–6.32 GHz) at a thickness of 4.4 mm, fully covering the n79 band (4.4–5.0 GHz) for 5G communications. Meanwhile, the in-plane thermal conductivity (λ) of the CoNi@BN/PDMS composites is 7.31 W m−1 K−1, which is ≈11.4 times of the λ (0.64 W m−1 K−1) for pure PDMS, and 32% higher than that of the (CoNi/BN)/PDMS composites (5.52 W m−1 K−1) with the same volume fraction of CoNi and BN obtained through direct mixing.

Original languageEnglish
Article number2410186
JournalAdvanced Materials
Volume36
Issue number48
DOIs
StatePublished - 27 Nov 2024

Keywords

  • hydrangea-like heterostructure fillers
  • microwave absorption
  • polydimethylsiloxane
  • thermal conductive composites

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