Room-temperature production of silver-nanofiber film for large-area, transparent and flexible surface electromagnetic interference shielding

TLDR

Electromagnetic interference from ubiquitous electronic devices poses growing concerns, yet achieving large‑area, transparent or curved surface shielding remains challenging. The study aims to fabricate a flexible, transparent silver‑nanofiber film for EMI shielding. This was accomplished by assembling the film through a room‑temperature roll‑to‑roll production process. The resulting 1 µm‑thick film transmits 89 % of visible light while providing ~20 dB shielding, and a 10 µm film achieves >50 dB shielding with >75 % transmittance, demonstrating scalable, high‑performance EMI protection for large‑area and special‑requirements spaces.

Abstract

Abstract A kind of pollution known as electromagnetic interference (EMI), which results from ubiquitous usage of various electronic communication and military radar equipment, has been receiving increasing attention recently. However, large-area EMI shielding on transparent and/or curved surfaces, including building windows, curved glass wall, and special requirements spaces (SRSs), remains hard to achieve. In this paper, a silver nanofiber (AgNF) based flexible and transparent EMI shielding film was successfully assembled via a room-temperature roll-to-roll production method. For transparent application scenario, AgNF with 89% transmittance in visible range and 1 μm thickness shows ~20 dB shielding efficiency (EMI SE). On the other hand, total shielding (>50 dB) is obtained when the thickness of AgNF increases to 10 μm, while its transmittance in visible range remains higher than 75%. Considering the facile and scale-free production technology, this material can be readily applied in large-scale, transparent, and/or SRSs EMI shielding.