TY - JOUR
T1 - Magnetic hierarchically porous biomass carbon for realizing broadband and strong absorption of electromagnetic wave
AU - Chang, Qing
AU - Xie, Zijun
AU - Long, Congzhen
AU - Feng, Xianting
AU - Shi, Bin
AU - Wu, Hongjing
N1 - Publisher Copyright:
© 2023 Elsevier Ltd and Techna Group S.r.l.
PY - 2023/8/15
Y1 - 2023/8/15
N2 - Hierarchically porous carbon materials provide favorable conditions for electromagnetic wave loss enhancement due to the superimposed positive influence of multilevel pores. However, high production costs and complex preparation limit their large-scale production. Biomass carbon with a natural hierarchically porous structure offers an alternative; however, the impedance mismatch and single-loss mechanism prevent biomass carbon from being an ideal absorbent for broadband and strong absorption. In this study, a series of magnetic hierarchically porous biomass carbons were prepared using a facile adsorption-inert calcination method. The natural hierarchical porous structure of the loofah sponge provides numerous adsorption sites for ferric ions, which are transformed in situ into Fe3O4 during calcination to regulate the conductivity. The impedance matching and electromagnetic loss properties of the biomass carbon/Fe3O4 composites were adjusted by varying the amount of ferric nitrate. Optimal performance occurs when ferric nitrate weighs 0.8 g, and the calcination temperature is 600 °C. Under these conditions, the effective absorption bandwidth reaches 5.28 GHz (11.84–17.12 GHz, 2.5 mm), and the minimum reflection loss (RLmin) is as low as −52.54 dB (4.5 mm), which is achieved by superior impedance matching and strong conduction loss together with polarization loss due heterogeneous interfaces and carbon defects. Our work provides a new perspective and a simple method for the large-scale production of high-efficiency biomass-based electromagnetic wave absorbents.
AB - Hierarchically porous carbon materials provide favorable conditions for electromagnetic wave loss enhancement due to the superimposed positive influence of multilevel pores. However, high production costs and complex preparation limit their large-scale production. Biomass carbon with a natural hierarchically porous structure offers an alternative; however, the impedance mismatch and single-loss mechanism prevent biomass carbon from being an ideal absorbent for broadband and strong absorption. In this study, a series of magnetic hierarchically porous biomass carbons were prepared using a facile adsorption-inert calcination method. The natural hierarchical porous structure of the loofah sponge provides numerous adsorption sites for ferric ions, which are transformed in situ into Fe3O4 during calcination to regulate the conductivity. The impedance matching and electromagnetic loss properties of the biomass carbon/Fe3O4 composites were adjusted by varying the amount of ferric nitrate. Optimal performance occurs when ferric nitrate weighs 0.8 g, and the calcination temperature is 600 °C. Under these conditions, the effective absorption bandwidth reaches 5.28 GHz (11.84–17.12 GHz, 2.5 mm), and the minimum reflection loss (RLmin) is as low as −52.54 dB (4.5 mm), which is achieved by superior impedance matching and strong conduction loss together with polarization loss due heterogeneous interfaces and carbon defects. Our work provides a new perspective and a simple method for the large-scale production of high-efficiency biomass-based electromagnetic wave absorbents.
KW - Broadband and strong absorption
KW - Conduction loss
KW - FeO
KW - Interfacial polarization
KW - Loofah sponge
UR - http://www.scopus.com/inward/record.url?scp=85160427499&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2023.05.242
DO - 10.1016/j.ceramint.2023.05.242
M3 - 文章
AN - SCOPUS:85160427499
SN - 0272-8842
VL - 49
SP - 27015
EP - 27023
JO - Ceramics International
JF - Ceramics International
IS - 16
ER -