Sustainable Biochar Coated Drywall with Electromagnetic Shielding Properties

The construction sector, traditionally focused on structural integrity and thermal performance, is now exploring the possibility of integrating electromagnetic shielding capabilities into building materials. Biochar, a material derived from biomass with a high carbon content, is a sustainable, renewable, eco-friendly, and cost-effective option in many applications. Recently, biochar has been added to construction materials to obtain electromagnetic shielding properties. In this work, commercial lignin biochar, thermally treated at 750° C, is applied on drywall panels to develop a building component with increased shielding properties for the construction sector. The transmission of drywall panels coated with several biochar layers is measured in the frequency band 5–12 GHz.