TY - JOUR
T1 - Catfish Effect Induced by Anion Sequential Doping for Microwave Absorption
AU - Tao, Jiaqi
AU - Xu, Linling
AU - Pei, Changbao
AU - Gu, Yansong
AU - He, Yanru
AU - Zhang, Xianfei
AU - Tao, Xuewei
AU - Zhou, Jintang
AU - Yao, Zhengjun
AU - Tao, Shifei
AU - Wu, Hongjing
N1 - Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2023/2/16
Y1 - 2023/2/16
N2 - Heteroatom doping engineering is desirable in tuning crystal structures and electrical properties, which is considered an opportunity to further develop microwave absorption materials. However, the competition mechanism and priority among doped atoms have not been revealed, which are insufficient to guide the most reasonable dielectric coupling model and design high-performance absorbers. In this work, based on in situ N and O, ex situ S is introduced through external thermal driving, leading to fierce competition among anions. Specifically, S atoms replace pyrrole N, drive out lattice O, and create O vacancies, bringing more extensive local charge redistribution and stronger electron interaction, thus activating the defect-induced polarization (3–6 times higher than conduction loss) in the middle/high-frequency region. Therefore, the effective absorption bandwidth (EAB) of 9.03 GHz and the minimum reflection loss (RLmin) of −64.05 dB at a filling rate of 10 wt.% are obtained, which improves the record of carbon absorbers as reported. Through macro-designs, i.e., multi-layer gradient metamaterial, or utilizing other advantages, e.g., cost-effective, stable chemical properties and wide-angle absorption, porous carbon may possess a great application prospect in the naval field.
AB - Heteroatom doping engineering is desirable in tuning crystal structures and electrical properties, which is considered an opportunity to further develop microwave absorption materials. However, the competition mechanism and priority among doped atoms have not been revealed, which are insufficient to guide the most reasonable dielectric coupling model and design high-performance absorbers. In this work, based on in situ N and O, ex situ S is introduced through external thermal driving, leading to fierce competition among anions. Specifically, S atoms replace pyrrole N, drive out lattice O, and create O vacancies, bringing more extensive local charge redistribution and stronger electron interaction, thus activating the defect-induced polarization (3–6 times higher than conduction loss) in the middle/high-frequency region. Therefore, the effective absorption bandwidth (EAB) of 9.03 GHz and the minimum reflection loss (RLmin) of −64.05 dB at a filling rate of 10 wt.% are obtained, which improves the record of carbon absorbers as reported. Through macro-designs, i.e., multi-layer gradient metamaterial, or utilizing other advantages, e.g., cost-effective, stable chemical properties and wide-angle absorption, porous carbon may possess a great application prospect in the naval field.
KW - anion competitions
KW - catfish effects
KW - heteroatom doping
KW - microwave absorption
KW - porous carbon
UR - http://www.scopus.com/inward/record.url?scp=85144031751&partnerID=8YFLogxK
U2 - 10.1002/adfm.202211996
DO - 10.1002/adfm.202211996
M3 - 文章
AN - SCOPUS:85144031751
SN - 1616-301X
VL - 33
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 8
M1 - 2211996
ER -