title: Surfactant-assisted solvothermal synthesis of pure nickel submicron spheres with microwave-absorbing properties.
abstract: Pure metallic nickel submicron spheres (Ni-SSs), flower-like nickel nanoflakes, and hollow micrometer-sized nickel spheres/tubes were controllably synthesized by a facile and efficient one-step solvothermal method with no reducing agent. The characteristics of these nickel nanostructures include morphology, structure, and purification. Possible synthesis mechanisms were discussed in detail. The resultant Ni-SSs had a wide diameter distribution of 200~800 nm through the aggregation of small nickel nanocrystals. The ferromagnetic behaviors of Ni-SSs investigated at room temperature showed high coercivity values. Furthermore, the microwave absorption properties of magnetic Ni-SSs were studied in the frequency range of 0.5-18.0 GHz. The minimum reflection loss reached -17.9 dB at 17.8 GHz with a thin absorption thickness of 1.2 mm, suggesting that the submicron spherical structures could exhibit excellent microwave absorption properties. More importantly, this one-pot synthesize route provides a universal and convenient way for preparation of larger scale pure Ni-SSs, showing excellent microwave absorption properties.
authors.affiliation: State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors.forename: Heng
authors.initials: H
authors.lastname: Guo
authors.affiliation: State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors.forename: Bingxue
authors.initials: B
authors.lastname: Pu
authors.affiliation: State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors.forename: Haiyuan
authors.initials: H
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors.forename: Yajun
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors.forename: Boateng
authors.initials: B
authors.lastname: Bismark
authors.affiliation: State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China.
authors.forename: Handong
authors.initials: H
authors.lastname: Li
authors.affiliation: State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China. xbniu@uestc.edu.cn.
authors.forename: Xiaobin
authors.initials: X
authors.lastname: Niu
keywords: Microwave absorption properties; Nickel nanostructures; Solvothermal method