Aligned Silver Nanowires Wrapped in Graphene as a Transparent Electrode for Electromagnetic Interference Shielding Applications

Abstract

This study introduces a solution-processed method for producing graphene-wrapped aligned silver nanowires (AgNWs) using electrodeless deposition, electrospinning, and subsequent electrodeposition. In contrast to their unwrapped counterparts, the graphene wrapping leads to a 46% reduction in sheet resistance while preserving transmittance. Finite-element theory-based electrical−thermal coupling analysis on AgNWs uncovers that a significant potential gradient, in conjunction with symmetrically distributed Joule heat, instigates the electrical failure of AgNWs. The graphene shell not only enhances the Joule heating stability of AgNWs but also boosts their electromagnetic interference shielding effectiveness by 20%, driven by amplified dual reflections and multiple dielectric relaxation processes.

Determination of Photothermal and EMI Shielding Efficiency of Graphene–Silver Nanoparticle Composites Prepared under Low-Dose Gamma Irradiation

“…Li et al covered a reflective layer of Al film with graphene/Ag nanoparticles coating and measured an EMI shielding effectiveness of 92.29 dB [ 18 ]. Nanowires of Ag were also investigated for EMI shielding applications, either sandwiched between graphene layers [ 19 ] or aligned and wrapped in graphene [ 20 ]. Apart from providing alternative pathways for electron transfer, graphene sheets act as barriers that block the contact of the Ag nanostructure with oxygen, which leads to a better stability of Ag nanostructures and a prolonged lifetime of the shielding material.…”