▎ 摘　　要

Lightweight and flexible materials with high electromagnetic interference (EMI) shielding performance are highly desirable in numerous occasions to prevent interference between electronic devices. Here, we designed graphene aerogel films (GAF) with multilayer structure, which showed low density (0.02 g cm(-3)), high flexibility and excellent shielding effectiveness (SE). SE reaches similar to 135 dB in 0.1 -3 GHz at thickness of 1.4 mm, and shows an uptrend from 65 to 105 dB in 2-18 GHz at thickness of 120 mm. In depth study reveal the excellent shielding performance is attributed to expansion enhancement effect, that shielding effectiveness can be significantly improved by expansion in an individual identical substance. The design of GAFs and the discovery of EEE open the avenue to lightweight materials with high EMI shielding performance. (C) 2018 Elsevier Ltd. All rights reserved.