title: Electromagnetic Property and Tunable Microwave Absorption of 3D Nets from Nickel Chains at Elevated Temperature.
abstract: We fabricated the nickel chains by a facile wet chemical method. The morphology of nickel chains were tailored by adjusting the amount of PVP during the synthesis process. Both the complex permittivity and permeability of the three-dimensional (3D) nets constructed by nickel chains present strong dependences on temperature in the frequency range of 8.2-12.4 GHz and temperature range of 323-573 K. The peaks in imaginary component of permittivity and permeability mainly derive from interfacial polarizations and resonances, devoting to dielectric and magnetic loss, respectively. The effect from both dielectric and magnetism contribute to enhancing the microwave absorption. The maximum absorption value of the 3D nickel chain nets is approximately -50 dB at 8.8 GHz and 373 K with a thickness of 1.8 mm, and the bandwidth less than -10 dB almost covers the whole investigated frequency band. These are encouraging findings, which provide the potential advantages of magnetic transition metal-based materials for microwave absorption application at elevated temperature.
authors: School of Material Science and Engineering, Beijing Institute of Technology , Beijing 100081, China.
authors: Jia
authors: J
authors: Liu
authors: School of Material Science and Engineering, Beijing Institute of Technology , Beijing 100081, China.
authors: Mao-Sheng
authors: MS
authors: Cao
authors: School of Material Science and Engineering, Beijing Institute of Technology , Beijing 100081, China.
authors: Qiang
authors: Q
authors: Luo
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
keywords: electromagnetic property; microwave absorption; nickel chains; polarization; resonance