▎ 摘　　要

NOVELTY - Preparing high electromagnetic shielding nanofiber gas gel having gradient structure, comprises (i) mixing isopropanol, deionized water and poly(vinyl alcohol-co-ethylene) (PVA-co-PE) nanofiber uniformly according to a certain proportion to obtain PVA-co-PE nanofiber suspension having pre-set concentration, (ii) adding graphene oxide and silver nanowires in a pre-set proportion into PVA-co-PE nanofiber suspension obtained in step (i), and freeze-drying to obtain poly(vinyl alcohol-co-ethylene)/silver nanowire/graphene oxide (PVA-co-PE/AgNW/GO) gas gel sheets having different pore sizes, and adhering PVA-co-PE/AgNW/GO gas gel sheets obtained in step (ii) according to the pore size from small to large to obtain final product. USE - The method is useful for preparing high electromagnetic shielding nanofiber gas gel having gradient structure. ADVANTAGE - The method improves electromagnetic shielding performance and wave-absorbing frequency. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for high electromagnetic shielding nanofiber gas gel having gradient structure obtained by above method.