TY - JOUR
T1 - Hollow Porous Bowl-like Nitrogen-Doped Cobalt/Carbon Nanocomposites with Enhanced Electromagnetic Wave Absorption
AU - Liang, Jin
AU - Chen, Jun
AU - Shen, Haiqi
AU - Hu, Ketao
AU - Zhao, Binnan
AU - Kong, Jie
N1 - Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/3/9
Y1 - 2021/3/9
N2 - A unique hollow porous bowl-like nitrogen-doped cobalt/carbon nanocomposite (HBN-Co/C) composed of Co nanoparticles anchored in N-doped porous carbon was designed for enhancing electromagnetic microwave absorption (EMA). The inner cavities of the HBN-Co/C could be regulated to match the impedance and permittivity between the absorber and air, leading to a precise adjustment of the EMA performance. More importantly, the existence of inner cavities decreases the extra multi-interface promoted interfacial polarization and overall density. The synergetic effects of the multicomponents, multiple reflections, and scatterings promoted strong interfacial polarization and facilitated impedance matching. As a result, the HBN-Co/C nanocomposites displayed excellent EMA performance, for which the minimum reflection loss was -42.3 dB at 13.3 GHz with a thickness of only 1.9 mm. The effective absorption bandwidth below -10 dB was up to 5.1 GHz (12.9-18.0 GHz) when the thickness was 1.7 mm. This work provides a facile design and synthesis strategy of novel lightweight electromagnetic wave absorbers with broadband and strong absorption.
AB - A unique hollow porous bowl-like nitrogen-doped cobalt/carbon nanocomposite (HBN-Co/C) composed of Co nanoparticles anchored in N-doped porous carbon was designed for enhancing electromagnetic microwave absorption (EMA). The inner cavities of the HBN-Co/C could be regulated to match the impedance and permittivity between the absorber and air, leading to a precise adjustment of the EMA performance. More importantly, the existence of inner cavities decreases the extra multi-interface promoted interfacial polarization and overall density. The synergetic effects of the multicomponents, multiple reflections, and scatterings promoted strong interfacial polarization and facilitated impedance matching. As a result, the HBN-Co/C nanocomposites displayed excellent EMA performance, for which the minimum reflection loss was -42.3 dB at 13.3 GHz with a thickness of only 1.9 mm. The effective absorption bandwidth below -10 dB was up to 5.1 GHz (12.9-18.0 GHz) when the thickness was 1.7 mm. This work provides a facile design and synthesis strategy of novel lightweight electromagnetic wave absorbers with broadband and strong absorption.
UR - http://www.scopus.com/inward/record.url?scp=85103490263&partnerID=8YFLogxK
U2 - 10.1021/acs.chemmater.0c04734
DO - 10.1021/acs.chemmater.0c04734
M3 - 文章
AN - SCOPUS:85103490263
SN - 0897-4756
VL - 33
SP - 1789
EP - 1798
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 5
ER -