Size controllable synthesis of cobalt-doped nickel oxide and their superior microwave dielectric response ability
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Size controllable synthesis of cobalt-doped nickel oxide and their superior microwave dielectric response ability Cong Chen1,2,*
, Wen Chen1, Bing Zong2, Xiaohai Ding1,2, and Haitao Dong1,2
1
School of Physics and Electronic Information Engineering, Qinghai Nationalities University, Xining 810007, People’s Republic of China 2 Asia Silicon (Qinghai) Co., Ltd, Xining 810007, Qinghai, People’s Republic of China
Received: 4 June 2020
ABSTRACT
Accepted: 24 September 2020
Low cost, stability, easy to produce, and strong dielectric loss ability materials are urgently required to manage increasingly serious electromagnetic pollution and radiation. Tradition metal oxides are considered promising alternatives; however, the ultralow dielectric behavior has greatly limited their EM absorption abilities. To strengthen the dielectric ability, herein, taking commonly NiO as a case, two synergistic strategies including element doing (here is Co) and size-tuning have been employed to step-by-step boost the dielectric loss ability. The mechanism for tuning the sizes of Co-dotted NiO can be easily realized by linearly changing the surfactant (PVP). Consequently, the precursor salts could disperse well and lead to a smaller size for the ultimately sample. The dielectric loss ability of the Co-dotted NiO with optimized size (tuning from 20 to 300 nm) has exhibited remarkable increase in dielectric loss ability, as compared to original NiO. After investigating the EM absorbing performance, the maximum effective absorption region of Co-dotted NiO reaches 3.8 GHz, showing wideband absorption ability. Therefore, utilization of size-tuning and element-doping strategy have been an effective strategy to increase the EM absorption ability of transition metal oxide.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Over the last decade, the communication technology has rapid development and produced many intelligent devices, yielding two opposite sides on our daily life [1, 2]. Discussing the positive side, these
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https://doi.org/10.1007/s10854-020-04548-4
intelligent devices allow us the convenient life. However, the frequent utilization of electronics have brought serious electromagnetic pollution, which is not only a threat to human being’s health, but also can cause serious EM interference among these wireless devices [3, 4]. To overcome EM pollution, it
J Mater Sci: Mater Electron
is widely believed that EM absorbing materials, which can dissipate the EM waves haven been regarded as most efficient way to deal with EM waves [5–7]. Generally, a desirable EM absorber is evaluated by many factors, such as reflection loss value (RL) and thin, effective frequency bandwidth (frequency region with RL\ - 10 dB) [8, 9]. To pursue a novel EM absorber, composites that are constructed with dielectric and magnetic component together to introduce dual magnetic and dielectric loss ability have been the common route to reach that purpose [10–12]. For ins
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