TY - JOUR
T1 - Preparation and electromagnetic wave absorption properties of SiC/SiO2 nanocomposites with different special structures
AU - Xiang, Zhongning
AU - He, Qinchuan
AU - Wang, Yiqun
AU - Yin, Xuemin
AU - Xu, Bingkun
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/10/15
Y1 - 2022/10/15
N2 - The special microscopic morphology and structure of electromagnetic (EM) wave absorbing materials are the key factors affecting their performance of EM wave absorption. In this work, three different special structures of SiO2/SiC nanocomposites (hollow spherical SiO2/SiC composite nanoparticles (HSPs), core–shell SiO2/SiC composite nanofibers (CSFs) and core–shell SiO2/SiC composite nanochains (CSCs)) are successfully prepared by self-assembly technology and high-temperature carbon thermal reduction method in a single crucible. The EM wave absorbing properties of them are investigated. The results show that HSPs have superior EM wave absorbing performance compared to CSCs and CSFs. The HSPs with a low filler loading of 10 wt% exhibit minimum reflection loss (RLmin) of −52.73 dB at 14.50 GHz with a thickness of 2.64 mm. Moreover, the maximum effective absorption bandwidth (EABmax) is up to 7.79 GHz (10.21–18 GHz) under a corresponding thickness of 2.62 mm. The special hollow spherical structure not only provides a large number of interfaces to enhance interfacial polarization, but also improves impedance matching characteristics, resulting in excellent EM wave absorption performance of HSPs. Thus, this work provides a reference for the structural design of an ideal EM wave absorber.
AB - The special microscopic morphology and structure of electromagnetic (EM) wave absorbing materials are the key factors affecting their performance of EM wave absorption. In this work, three different special structures of SiO2/SiC nanocomposites (hollow spherical SiO2/SiC composite nanoparticles (HSPs), core–shell SiO2/SiC composite nanofibers (CSFs) and core–shell SiO2/SiC composite nanochains (CSCs)) are successfully prepared by self-assembly technology and high-temperature carbon thermal reduction method in a single crucible. The EM wave absorbing properties of them are investigated. The results show that HSPs have superior EM wave absorbing performance compared to CSCs and CSFs. The HSPs with a low filler loading of 10 wt% exhibit minimum reflection loss (RLmin) of −52.73 dB at 14.50 GHz with a thickness of 2.64 mm. Moreover, the maximum effective absorption bandwidth (EABmax) is up to 7.79 GHz (10.21–18 GHz) under a corresponding thickness of 2.62 mm. The special hollow spherical structure not only provides a large number of interfaces to enhance interfacial polarization, but also improves impedance matching characteristics, resulting in excellent EM wave absorption performance of HSPs. Thus, this work provides a reference for the structural design of an ideal EM wave absorber.
KW - Carbon thermal reduction
KW - Electromagnetic wave absorption
KW - Hollow spherical
KW - Reflection loss
KW - SiO/SiC nanocomposites
UR - https://www.scopus.com/pages/publications/85132897005
U2 - 10.1016/j.apsusc.2022.153968
DO - 10.1016/j.apsusc.2022.153968
M3 - 文章
AN - SCOPUS:85132897005
SN - 0169-4332
VL - 599
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 153968
ER -