title: NiO hierarchical nanorings on SiC: enhancing relaxation to tune microwave absorption at elevated temperature.
abstract: 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.
authors: †School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.|‡Department of Physics, Tangshan Normal University, Tangshan 063000, China.
authors: Hui-Jing
authors: HJ
authors: Yang
authors: §School of Science, Minzu University of China, Beijing 100081, China.
authors: Wen-Qiang
authors: WQ
authors: Cao
authors: †School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors: De-Qing
authors: DQ
authors: Zhang
authors: †School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors: Tie-Jian
authors: TJ
authors: Su
authors: §School of Science, Minzu University of China, Beijing 100081, China.
authors: Hong-Long
authors: HL
authors: Shi
authors: §School of Science, Minzu University of China, Beijing 100081, China.
authors: Wen-Zhong
authors: WZ
authors: Wang
authors: §School of Science, Minzu University of China, Beijing 100081, China.
authors: Jie
authors: J
authors: Yuan
authors: †School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors: Mao-Sheng
authors: MS
authors: Cao
keywords: NiO nanorings; dielectric properties; hierarchical architecture; microwave absorption; multirelaxation