Serious electromagnetic interference pollution, the fourth and growing source of pollution, is omnipresent and presents extensive threats to biological systems by promoting cancer, inducing breakdown of DNA strands and weakening immune system. It is highly demanded to develop high-performance microwave absorbers to address this issue. By using layer-by-layer assembly, we have synthesized dielectric-magnetic SiC-Co hybrid nanowires in which the inner is SiC nanowire and the outside is covered with uniform Co nanoparticles. The decoration of Co on SiC nanowires could be easily tuned by controlling the reaction time. The electronic structures were studied by analyzing their Si K-edge, Si L-edge, O K-edge and Co L-edge X-ray absorption near-edge structures. It is found that charges are redistributed in the hybrids through Si-O-Co bondings, which lead to the complementarity between the dielectric loss and magnetic loss. Under an altering electromagnetic field, the synergetic interaction between magnetic and dielectric components extensively attenuate microwaves. The excellent microwave absorption ability endows them with great potential as materials for microwave absorption applications.

SiC-Co hybrid nanowires: Fabrication, electronic structure, and absorption on electromagnetic waves

248th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.