A one-step graphene induction strategy enables in-situ controllable growth of silver nanowires for electromagnetic interference shielding
2021
Jia, Hui | Yi, Zong-Lin | Huang, Xian-Hong | Su, Fang-Yuan | Kong, Qing-Qiang | Yang, Xiao | Wang, Zheng | Xie, Li-Jing | Guo, Quan-Gui | Chen, Cheng-Meng
The introduction of silver nanowires (AgNWs) with high electrical conductivity into graphene skeletons significantly enhances its electromagnetic shielding performance. However, the complicated procedures and low yield of the AgNWs preparation and the lack of strong interaction between graphene and AgNWs by physical self-assembly method limits the electromagnetic shielding application. Herein, a one-step graphene induction strategy without other nucleating and morphology agents of halide ion is exploited for the in-situ synthesis graphene/AgNWs composite. The O=C–O groups of graphene provide a nucleation site to combine Ag nucleus. Importantly, graphene with oxygen functional groups acts as an “Ag⁺ pool” to store and release abundant Ag⁺, supplying consecutively Ag⁺ for AgNWs growth and inhibiting excessive nucleation. Benefiting from the high ohmic loss of 3D conductive network, the resulting graphene/AgNWs coating exhibits remarkable electromagnetic shielding effectiveness of 76.59 dB. This provides a broad prospect for the as high-performance electromagnetic shielding materials.
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