Facile preparation of carbon-coated Mg nanocapsules as light microwave absorber

Core/shell-structured Mg/C nanocapsules with Mg nanoparticles as the core and onion-like carbon as the shell are synthesized by the arc-discharge method. An optimal RL value of 17.02 dB was observed at 11.2 GHz on a specimen with a matching thickness of 3.0 mm. Theoretical simulation for the microwave absorption using the transmission line theory agrees reasonably well with the experimental results. The transmission-line theory also can be used to calculate the RL of nom-magnetic nanocapsules. (C) 2015 Elsevier B.V. All rights reserved.