期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 13, 页码 7073-7077出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b01122
关键词
NiO nanorings; hierarchical architecture; dielectric properties; multirelaxation; microwave absorption
资金
- National Natural Science Foundation of China [51132002, 51072024, 51372282]
- Hebei Province Natural Science Foundation [E2015105079]
We fabricated NiO nanorings on SiC, a novel hierarchical architecture, by a facile two-step method. The dielectric properties depend on temperature and frequency in the range from 373 to 773 K and X band. The imaginary part and loss tangent increase more than four times and three times with increasing temperature, respectively. The architecture demonstrates multirelaxation and possesses high-efficient absorption. The reflection loss exceeds -40 dB and the bandwidth covers 85% of X band (approximately -20 dB). The synergistic effect between multirelaxation and conductance is beneficial to the microwave absorption. Our findings provide a novel and feasible strategy to tune microwave absorption.
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