Abstract
Rapid expansion in microelectronic devices has prompted increasing research efforts in development of high-frequency electromagnetic wave absorption materials. Multiple-phase FeSn2/Sn/Graphite core-shell nanoparticles synthesized by an arc-discharge method, with controllable components and structures, present a typical cloaking feature aroused from the superior electromagnetic wave absorption. Based on transmission line theory, we prove quantitatively that more than 90% of the electromagnetic power can be attenuated at 9-18 GHz. Experimental results coupled with theory calculations by the Cole-Cole equation and the eddy-current model, further reveal that such high performances are originated from the onion-type interfacial architecture at nanoscale and the desirable impedance match resulting from multiple phase components. (C) 2015 Elsevier Ltd. All rights reserved.