Dissipation enhancement effect from titania semiconductor modulation of graphene-based electromagnetic absorbing composites

Abstract

A scheme of semiconductor modulation of electromagnetic (EM) absorbing materials is proposed. Homogeneous composites as ideal media are obtained by uniformly mixing fillers using supercritical fluid (SCF) processing. Based on the ideal media, titania modulation design prediction of surface shield materials is confirmed for the EM composites of graphene nanosheets and manganese oxides. A low ratio of titania between 10 percent and 50 percent gives rise to dissipation enhancement in the absorbers. Simulation of the involved cases displays the EM fields in the composite absorbers, demonstrating EM energy loss in the absorbers. Frequency modulation using titania improves the electromagnetic compatibility (EMC) of the absorbing materials in the X and K_u bands. Rapid exfoliation and full premixing of the components by SCF contribute to the modulation scheme confirmation with uniform media. Semiconductor titania modulation of EM-absorbing composites is effective.