TY - JOUR
T1 - Porous magnetic carbon spheres with adjustable magnetic-composition and synergistic effect for lightweight microwave absorption
AU - Xu, Hanxiao
AU - He, Zizhuang
AU - Li, Yurou
AU - Wang, Yiruo
AU - Zhang, Zhongwei
AU - Dai, Xiaoqing
AU - Xiong, Ziming
AU - Geng, Wangchang
AU - Liu, Panbo
N1 - Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/9
Y1 - 2023/9
N2 - The chemical composition of reduced magnetic particles strongly correlates with the reduction potential of their metal species. However, this phenomenon rarely has been investigated in magnetic-dielectric absorbers. In this manuscript, a formaldehyde-assisted metal-ligand crosslinking strategy is employed to incorporate different metal species (Fe3+, Co2+, Co2+-Ni2+) into the colloidal frameworks by the chelating coordination. Because of their different reduction potentials, porous magnetic carbon spheres (PMCSs) with adjustable magnetic-composition and micro-mesoporous characteristics are constructed via the subsequent annealing process. Compared with self-assembly polyphenol derived porous carbon spheres (PCSs), these PMCSs, including Fe3O4-PMCSs, Co-PMCSs and CoNi-PMCSs, exhibit promoted impedance matching and superior microwave absorption attenuation owing to the additional magnetic resonance and synergistic effect. As results, the optimal reflection loss and corresponding bandwidth are −48.6 dB and 7.8 GHz, −45 dB and 8.6 GHz, −53.2 dB and 5.1 GHz for Fe3O4-PMCSs, Co-PMCSs and CoNi-PMCSs with only 15 wt% filler loading, both are higher than PCSs (−39.3 dB and 4.8 GHz). This study inspires us a novel inspiration in constructing of adjustable magnetic-composition and the fabricated PMCSs can be used as lightweight microwave absorbers in the application of electromagnetic protection.
AB - The chemical composition of reduced magnetic particles strongly correlates with the reduction potential of their metal species. However, this phenomenon rarely has been investigated in magnetic-dielectric absorbers. In this manuscript, a formaldehyde-assisted metal-ligand crosslinking strategy is employed to incorporate different metal species (Fe3+, Co2+, Co2+-Ni2+) into the colloidal frameworks by the chelating coordination. Because of their different reduction potentials, porous magnetic carbon spheres (PMCSs) with adjustable magnetic-composition and micro-mesoporous characteristics are constructed via the subsequent annealing process. Compared with self-assembly polyphenol derived porous carbon spheres (PCSs), these PMCSs, including Fe3O4-PMCSs, Co-PMCSs and CoNi-PMCSs, exhibit promoted impedance matching and superior microwave absorption attenuation owing to the additional magnetic resonance and synergistic effect. As results, the optimal reflection loss and corresponding bandwidth are −48.6 dB and 7.8 GHz, −45 dB and 8.6 GHz, −53.2 dB and 5.1 GHz for Fe3O4-PMCSs, Co-PMCSs and CoNi-PMCSs with only 15 wt% filler loading, both are higher than PCSs (−39.3 dB and 4.8 GHz). This study inspires us a novel inspiration in constructing of adjustable magnetic-composition and the fabricated PMCSs can be used as lightweight microwave absorbers in the application of electromagnetic protection.
KW - Impedance matching
KW - Metal-phenolic coordination
KW - Porous characteristics
KW - Reduction potential
KW - Synergistic effect
UR - http://www.scopus.com/inward/record.url?scp=85165978346&partnerID=8YFLogxK
U2 - 10.1016/j.carbon.2023.118290
DO - 10.1016/j.carbon.2023.118290
M3 - 文章
AN - SCOPUS:85165978346
SN - 0008-6223
VL - 213
JO - Carbon
JF - Carbon
M1 - 118290
ER -