Lightweight carbon-based foams made from bacterial cellulose for electromagnetic interference (EMI) shielding

Abstract

Carbon-based materials have exhibited great potential as electromagnetic interference (EMI) shielding materials due to their various advantages of light weight, good corrosion resistance, high mechanical strength, etc. Here, carbonized bacterial cellulose (CBC) with 3D network structure was formed by pyrolyzing the freeze dried bacterial cellulose (BC) at 800, 900 and 1000 °C, respectively. Compared with BC, the electrical properties and EMI shielding effectiveness of CBC were significantly enhanced. Moreover, the as-prepared CBC foam pyrolyzed at 1000 °C for 2 h exhibits low density of 0.02 g cm ³ , high electrical conductivity of 6.24 S m ^-1 , high EMI shielding effectiveness (SE) of 23 dB and corresponding special EMI SE of 1150 dB cm ³ , demonstrating a promising lightweight EMI shielding material.