TY - JOUR
T1 - One-dimensional Ag-CoNi nanocomposites modified with amorphous Sn(OH)2/SnO2 shells for broadband microwave absorption
AU - Qiao, Mingtao
AU - Li, Jiaxin
AU - Chen, Tiantian
AU - He, Xiaowei
AU - Meng, Meiyu
AU - Lei, Xingfeng
AU - Wei, Jian
AU - Zhang, Qiuyu
N1 - Publisher Copyright:
© 2021 Elsevier Inc.
PY - 2021/12/15
Y1 - 2021/12/15
N2 - High-performance microwave absorption absorbers play important roles in the fields of radar stealth, electromagnetic protection, and antenna technology. In this work, high aspect-ratio Ag nanowires were decorated with magnetic CoNi nanoparticles via a PVP-induced solvothermal method, and then amorphous Sn(OH)2/SnO2 shells were introduced through an in-situ oxidative hydrolysis method, successfully preparing Ag-CoNi@Sn(OH)2/SnO2 composites. The morphology and ingredient of composites were ascertained by SEM, TEM, XRD, EDX, and XPS. As Ag-CoNi nanocomposites are coated by Sn(OH)2/SnO2 shells, the minimum reflection loss value is decreased from −31.7 dB (10.1 GHz) to −37.8 dB (6.4 GHz), and the maximum effective absorption bandwidth is extended from 3.9 GHz (10.3–14.2 GHz) to 5.8 GHz (10.7–16.5 GHz). Analyses of electromagnetic parameters reveal the possible mechanisms, involving surface plasma resonance, conductive loss, interfacial polarization, dipole polarization, exchange resonance, eddy current effect, multiple reflection and scattering. Thus, Ag nanowires modified with CoNi nanoparticles and amorphous Sn(OH)2/SnO2 shells can effectively balance the impedance matching and attenuation capability. It is a new strategy to achieve broadband microwave absorbers.
AB - High-performance microwave absorption absorbers play important roles in the fields of radar stealth, electromagnetic protection, and antenna technology. In this work, high aspect-ratio Ag nanowires were decorated with magnetic CoNi nanoparticles via a PVP-induced solvothermal method, and then amorphous Sn(OH)2/SnO2 shells were introduced through an in-situ oxidative hydrolysis method, successfully preparing Ag-CoNi@Sn(OH)2/SnO2 composites. The morphology and ingredient of composites were ascertained by SEM, TEM, XRD, EDX, and XPS. As Ag-CoNi nanocomposites are coated by Sn(OH)2/SnO2 shells, the minimum reflection loss value is decreased from −31.7 dB (10.1 GHz) to −37.8 dB (6.4 GHz), and the maximum effective absorption bandwidth is extended from 3.9 GHz (10.3–14.2 GHz) to 5.8 GHz (10.7–16.5 GHz). Analyses of electromagnetic parameters reveal the possible mechanisms, involving surface plasma resonance, conductive loss, interfacial polarization, dipole polarization, exchange resonance, eddy current effect, multiple reflection and scattering. Thus, Ag nanowires modified with CoNi nanoparticles and amorphous Sn(OH)2/SnO2 shells can effectively balance the impedance matching and attenuation capability. It is a new strategy to achieve broadband microwave absorbers.
KW - Ag nanowires
KW - Amorphous shells
KW - CoNi nanoparticles
KW - Microwave absorption
UR - https://www.scopus.com/pages/publications/85110392650
U2 - 10.1016/j.jcis.2021.07.017
DO - 10.1016/j.jcis.2021.07.017
M3 - 文章
C2 - 34280759
AN - SCOPUS:85110392650
SN - 0021-9797
VL - 604
SP - 616
EP - 623
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
ER -