Ammonium Bicarbonate Templated 3D PDMS/rGO@CoFe2O4 Composite Foams for Effective Electromagnetic Interference Shielding and Thermal Insulation

In the past 50 years, the electronic and communication industries have grown exponentially, which has caused major worry about electromagnetic (EM) pollution. In recent years, more thrust has been given to developing appropriate polymer composites to lessen EMI pollution. In the present work, porous polydimethylsiloxane (PDMS) composite foams based on cobalt ferrite (CoFe 2 O 4 ) and reduced Graphene Oxide (rGO) were produced through the ammonium bicarbonate template approach. The resulting foams possess increased EMI shielding effectiveness via the absorption‐dominated mechanism due to the PDMS foam functions as a three‐dimensional network, rGO offers the requisite conductive channel, and CoFe 2 O 4 produces a sufficient magnetic loss. The total EMI SE of PDMS/rGO composite foams without CoFe 2 O 4 is 24 dB, however with different weight percentage of CoFe 2 O 4 added (3%, 6%, and 9%), the EMI SE increases to 41 dB at 3 mm thickness. The heat insulation performance of the material is also studied, and the measured thermal conductivity is 0.0391 Wm ‐1 K ‐1 , which is a very low. The attributes of the composite foam underscore its excellent thermal insulation performance and its capacity for EMI shielding, rendering it highly suitable for diverse applications across various fields. This article is protected by copyright. All rights reserved.