Flexible and Conductive Cellulose Composite Paper for Highly Efficient Electromagnetic Interference Shielding

Abstract

Developing highly efficient electromagnetic interference (EMI) shielding materials with outstanding mechanical properties are urgently desirable for portable device hardware and flexible electronic devices. Herein, a highly conductive and flexible silver nanowires/graphene nanosheets/cellulose (AgNWs/GNSs/cellulose) composite paper with particular three‐layered structures is fabricated via vacuum assisted filtered and coating method. The prepared composites exhibit excellent EMI shielding property due to the unique layered structure. By changing the order of the conductive layers, the overall shielding performance can be further improved. An outstanding EMI shielding effectiveness (SE) of 53.3 dB is achieved with a thickness of only 0.17 mm. The composites show prominent bending resistance, which is proved by 1000 times of repeated bending leading to no obvious changes in structure. Moreover, the prepared composites exhibit excellent mechanical properties. Therefore, it is expected that this work will open up a facile strategy for exploiting materials with excellent EMI shielding properties and mechanical performance.

Biodegradable, Flexible Transparent Ordered Ag NWs Micromesh Conductor for Electrical Heater and Electromagnetic Interference Shielding Applications

“…These phenomena were also observed in other various shielding materials such as carbon nanotubes and Mxene. 6,59,60 In addition, as shown in Figure S8c, the interior of the Ag NMs/ePLLA conductor with multiple layers induced multiple reflections that could not be ignored and consumed large amounts of electromagnetic waves. Besides the EMI shielding effectiveness, the EMI shielding materials also require a light weight and thin thickness for special applications such as wearable electronics and military and aerospace purporses.…”

High-performance carbon nanotube-cellulose nanofiber bulk materials with multifunctional applications in thermal management and shielding from electromagnetic interference

“…33 Compared with reported cellulose-based EMI shielding materials (Fig. 5e and Table S4 †), [34][35][36][37][38][39] CCNB 4 -10 This journal is © The Royal Society of Chemistry 2022 achieved excellent mechanical properties, electrical conductivity, and EMI-shielding efficiency, thereby revealing the feasibility of using CCNBs for high-performance EMI-shielding materials.…”

Superhydrophobic flexible conductive PFDT/CB/MXene@Paper for high-efficiency EMI shielding and Joule heating applications

“…19 Hence, green paper based EMI shielding materials with the advantages of low cost, renewability, and biodegradability have attracted widespread attention. [20][21][22][23] For example, Zhang et al 22 reported a three-layer structured highly conductive flexible silver nanowire/graphene nanosheet/cellulose composite paper via the vacuum-assisted filtration and coating method, exhibiting an EMI shielding effectiveness (SE) of 53.3 dB at a thickness of only 0.17 mm. In addition, Li et al 20 prepared a biodegradable paper based material composed of an electromagnetic loss layer (graphene/nanosilver coating) and a reflective layer (aluminum film layer), and an ultra-high EMI SE of 92.29 dB within 8-13 GHz was successfully achieved.…”