Component controllable of graphene/NiO composite with superior shielding of microwave wave ability based on dielectric d
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Component controllable of graphene/NiO composite with superior shielding of microwave wave ability based on dielectric dissipation 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, Qinghai 810007, People’s Republic of China
Received: 5 August 2020
ABSTRACT
Accepted: 29 September 2020
As a classic two-dimensional (2D) material, graphene has been regarded as a potential electromagnetic (EM) shielding material, owing to the excellent conductivity, dielectric loss ability and chemical stability. Recent advances proved that graphene possessed the ultrahigh EM-shielding coefficient, but the shielding mechanism was mainly original from the strong wave reflection, hence has inevitably resulted in the second EM pollution. To reduce the wave reflection, herein, a component tunable of graphene/NiO composites have been produced via loading the NiO nanoparticles on the graphene nanosheets. Due to the smaller dielectric value of loaded NiO, the as-prepared graphene/NiO has moderately permittivity value, thereby would increase the incomings of microwaves. Meanwhile, the graphene/NiO has desirable dielectric loss ability, which enabled to dissipate the incomings of microwave into heats. To strengthen the microwave dissipating ability, the component of NiO has been optimized. The resulted shows the EM shielding coefficient could reach 22 dB under a thickness of 1.2 mm. While the microwave reflection coefficient (SER) could be reduced to 5.8 dB, suggesting the absorption dominate ability. According to this result, it can be found that employing a metal oxide that low in dielectric is an efficient method for developing high-performance absorptiondominate EM-shielding material.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10854-020-04573-3
J Mater Sci: Mater Electron
1 Introduction During the past decade, there is an increasingly requirements of wireless electrons which has been wide-spread used in our daily life and provided us a convenient life [1, 2]. Despite human beings are enjoys the benefits from these wireless devices, the negative effects, such as electromagnetic (EM) interference and radiation are very prominent, thereby urgently to solve [3–6]. In case to solve these bad effects, EM shielding materials are highly in demanded that can protect the protector out of interference or radiation via directly wave reflection or absorption [7–9]. Usually, the EM shielding performance is mainly estimated by EM effectiveness (SET), contributed by reflection (SER) and absorption (SEA) [3, 10–13]. To seek a high SET value, lots of dielectric dependent materials have received enough attentions, owing to their big SER value [14, 15]. Taking graphene as a case, the SET value of graphene reported by Shen et al. reached * 49.
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