TY - JOUR
T1 - Excellent Low-Frequency Microwave Absorption and High Thermal Conductivity in Polydimethylsiloxane Composites Endowed by Hydrangea-Like CoNi@BN Heterostructure Fillers
AU - He, Mukun
AU - Zhong, Xiao
AU - Lu, Xinghan
AU - Hu, Jinwen
AU - Ruan, Kunpeng
AU - Guo, Hua
AU - Zhang, Yali
AU - Guo, Yongqiang
AU - Gu, Junwei
N1 - Publisher Copyright:
© 2024 Wiley-VCH GmbH.
PY - 2024/11/27
Y1 - 2024/11/27
N2 - 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.
AB - 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.
KW - hydrangea-like heterostructure fillers
KW - microwave absorption
KW - polydimethylsiloxane
KW - thermal conductive composites
UR - http://www.scopus.com/inward/record.url?scp=85205939092&partnerID=8YFLogxK
U2 - 10.1002/adma.202410186
DO - 10.1002/adma.202410186
M3 - 文章
C2 - 39380425
AN - SCOPUS:85205939092
SN - 0935-9648
VL - 36
JO - Advanced Materials
JF - Advanced Materials
IS - 48
M1 - 2410186
ER -