Journal
NANOTECHNOLOGY
Volume 25, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/3/035704
Keywords
nanocapsules; microwave absorption; carbon shell
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By utilizing a simple and low-cost arc-discharge method in either liquid nitrogen or ethanol at ambient temperature and pressure, carbon-coated cementite (Fe3C) nanocapsules, with size ranges of 10-60 nm and 10-20 nm, respectively, have been synthesized on a large scale. The Fe3C/C nanocapsules synthesized in different media possess similar permeability but different permittivity, which results from the different defect amounts within the carbon shell. It has been found that the as-prepared products exhibit different electromagnetic wave absorption abilities: for the ones prepared in liquid nitrogen, the optimal reflection loss is above 10 dB in the range of 1-18 GHz with the thickness ranging from 1 to 10 mm; meanwhile, for those fabricated in ethanol, the reflection loss could be below 20 dB within the thickness range of 1.5-2.4 mm in the frequency range of 10-15 GHz, and reach 38 dB at a thickness of 1.9 mm with a matching frequency of 12.9 GHz. This indicates that the nanocapsules prepared in ethanol exhibit good electromagnetic wave absorption properties. These results provide a new way to fabricate carbon-coated Fe3C nanocapsules with the ability of electromagnetic wave absorption.
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