Tunable and Ultraefficient Microwave Absorptivity in Sno2/Sn/Rgo Composites Via Enhanced Polarization Effect

Abstract

Absorbing materials with effective frequency modulation are expected to meet practical application requirements but remain a significant challenge. Herein, a high efficiency and absorption-range electromagnetic wave absorber is proposed, and a series of rGO-based composites and the realization of effective frequency modulation in 8-14 GHz (< -10 dB) were successfully obtained by controlling the interface components (SnO2/Sn). It ascribes to the adjustable relaxation polarization, which plays a decisive role in microwave loss and frequency modulation mechanisms. And the ideal regulation range of relaxation polarization for dielectric loss materials is confirmed (0.09-3.1) according to the optimal impedance matching principle. In addition, the Sn/rGO and paraffin composite absorbers with reflection loss values of -39.5 dB at 3 mm are obtained in X-band (5 wt.%). The enhanced polarization loss and microwave absorptivity can be explained in terms of the intrinsic carrier concentration and the carrier migration. This strategy and theoretical analysis proposed here may provide a new perspective for the design of absorbing devices in a practical application.

Keywords: unable microwave absorption frequency, microwave absorptivity, polarization effect, carrier migration, interface components