Self-Assembly Constructing WS2-rGO Architecture with Green EMI Shielding.

Abstract

Accurately tailoring electromagnetic (EM) materials achieving high-performance electromagnetic interference (EMI) shielding is significantly imperative with increasing EM pollution worldwide. Green EMI shielding materials are attracting extensive attention due to the less additional environment hazard caused by the lower secondary reflection. However, the conflict between high efficiency and eco-friendliness makes green EMI shielding still challenging. In this work, a new strategy of tuning guest into host is developed for the first time, and a unique WS2-rGO architecture of mountain-like wall is constructed successfully achieving efficient and green EMI shielding. The shielding efficiency (SE) is all over 20 dB in the investigated frequency (2 to 18 GHz), and the maximum reaches 32 dB with endearing green index (gs ≈ 1.0). The efficient and green EMI SE is ascribed to the multilevel structure and intrinsic dielectric properties of WS2-rGO architecture, including the synergy of relaxation and conduction, multi-scattering among interface and void, and the equivalent wedge effect. These results demonstrate that WS2-rGO architecture is a promising candidate in EM transducer, microwave imaging, EM protection and energy devices.