Electromagnetic Pulse Response Characteristics of AgNWs@SiO2/PVA Composites

The materials with electrical-field induced nonlinear conductive characteristics for adaptive electromagnetic pulse (EMP) protection are strongly desired. In this paper, the core-shell hybrid nanoparticles of SiO2-decorated silver nanowire hybrids (AgNWs@SiO2) were synthesized via a sol-gel process employed in a polyvinyl alcohol (PVA) matrix material to prepare composites. The characterizations test indicates that the AgNWs were coated with silica and the hybrid particles were dispersed uniformly in matrix. The EMP response characteristics of samples with different filling concentrations under the square-wave were obtained. The results show that the voltage amplitude of output waveform is attenuated obviously, and a reflected waveform appears, which indicates that the resistivity of the sample decreases sharply induced by strong EMP. The mechanism of the EMP response characteristic of the composites was discussed, which verified the application prospects in the fields of adaptive EMP protection.