Controlling the electric permittivity of honeycomb-like core–shell Ni/CuSiO3 composite nanospheres to enhance microwave absorption properties

Rambabu Kuchi; Taha Latif; Sung Woo Lee; Viet Dongquoc; Phuoc Cao Van; Dongsoo Kim; Jong-Ryul Jeong

doi:10.1039/C9RA08513K

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Controlling the electric permittivity of honeycomb-like core–shell Ni/CuSiO₃ composite nanospheres to enhance microwave absorption properties†

Rambabu Kuchi,‡^abc Taha Latif,‡^a Sung Woo Lee,^a Viet Dongquoc,^a Phuoc Cao Van,

^a Dongsoo Kim^bc and Jong-Ryul Jeong

*^a

Author affiliations

* Corresponding authors

^a Department of Materials Science and Engineering, Graduate School of Energy Science and Technology, Chungnam National University, Daejeon 34134, South Korea
E-mail: jrjeong@cnu.ac.kr
Fax: +82-42-822-5850
Tel: +82-42-821-6633

^b Powder & Ceramics Division, Korea Institute of Materials Science, Changwon, Gyeongnam 51508, South Korea

^c Convergence Research Center for Development of Mineral Resources, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, South Korea

Abstract

Controlling impedance matching and enhancing absorption properties are crucial for developing next-generation microwave absorbing materials. Herein, we report the facile preparation of honeycomb-like core–shell nickel/copper silicate (Ni/CuSiO₃) composite nanospheres with controlled shell (CuSiO₃) thickness to control impedance matching and enhance absorption properties. The nanospheres with a shell thickness of about 30 nm had greatly improved microwave absorption performance. They exhibited a strong reflection loss of −39.5 dB (9.6 GHz) at the absorber thickness of 2.5 mm, with a wide effective absorbing bandwidth of 4.8 GHz (7.8–12.6 GHz). This remarkable microwave absorption performance is attributed to a novel structure that enhanced interfacial polarization and controlled shell thickness, resulting in good impedance matching of electromagnetic properties (ε, μ) and magnetic loss. Our permittivity-controlled core–shell Ni/CuSiO₃ composite nanospheres could be used to fabricate novel high-performance microwave absorbers.

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Article information

DOI: https://doi.org/10.1039/C9RA08513K
Article type: Paper
Submitted: 17 Oct 2019
Accepted: 24 Dec 2019
First published: 07 Jan 2020
This article is Open Access

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RSC Adv., 2020,10, 1172-1180

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Controlling the electric permittivity of honeycomb-like core–shell Ni/CuSiO₃ composite nanospheres to enhance microwave absorption properties

R. Kuchi, T. Latif, S. W. Lee, V. Dongquoc, P. Cao Van, D. Kim and J. Jeong, RSC Adv., 2020, 10, 1172 DOI: 10.1039/C9RA08513K

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