Issue 41, 2012

Facile synthesis of hollow porous cobalt spheres and their enhanced electromagnetic properties

Abstract

We report a template-free approach to prepare hollow porous cobalt spheres by combining a facile solvent-thermal route with a chemical reduction process. The synthesized cobalt microspheres with diameter of approximately 2–4 μm have a shell thickness of about 150 nm. The hollow Co microsphere is built from particle-like ligaments with diameter of ca. 80–150 nm and there are a lot of pores with size of several tens of nm on the shell. The hollow porous cobalt spheres exhibited saturation magnetization (Ms) of 163.0 emu g−1 and large coercivity (Hcj) of 307.9 Oe. The epoxy resin composites with 30 wt% and 60 wt% hollow porous cobalt sample showed efficient EM wave absorption characteristics (RL < −20 dB) in the ranges of 11.3–18.0 GHz and 4.0–12.0 GHz over absorber thicknesses of 1.4–2.0 mm and 1.4–4.0 mm, respectively. Our study demonstrates the potential application of hollow porous ferromagnetic materials as a more efficient electromagnetic wave absorber.

Graphical abstract: Facile synthesis of hollow porous cobalt spheres and their enhanced electromagnetic properties

Article information

Article type
Paper
Submitted
15 May 2012
Accepted
30 Aug 2012
First published
31 Aug 2012

J. Mater. Chem., 2012,22, 22160-22166

Facile synthesis of hollow porous cobalt spheres and their enhanced electromagnetic properties

C. He, S. Qiu, X. Wang, J. Liu, L. Luan, W. Liu, M. Itoh and K. Machida, J. Mater. Chem., 2012, 22, 22160 DOI: 10.1039/C2JM33068G

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