Graphene enabled EMI shielding function for future composite materials (GR-EMI))

Purpose and goal: The project was carried out as an SME project within the framework of Vinnova´s Competence Centre 2D Tech.

The GR-EMI Project aimed to transfer graphene´s unique properties, such as electrical conductivity and high-frequency EM wave shielding, to fiber-based textiles used in composites. Supported by the 2D Tech Competence Centre, we coated synthetic (glass) and natural (flax) fibers with graphene, created composite samples, and studied their EMI shielding across 1-40 GHz, targeting applications in telecom, security, and self-driving transport.

Promising results obtained, show the potential to graphene-engineer future composites to be smart and environmentally friendly. Expected results and effects:

The project´s main idea is verified and confirmed. The experimental samples of graphene-coated flax and synthetic glass fiber composite were fabricated and tested for EMI shielding efficiency. It is shown that via graphene coating the natural fibers can shield the electromagnetic field (1 to 40 GHz), with a tendency towards even higher efficiency at higher frequencies (over 8 GHz).

The results obtained proves the idea, that graphene can be efficiently used for making smart and sustainable composites, replacing metals or high CO polluting carbon fibers in future applications. Approach and implementation:

Samples of the composite materials were made with natural fibers (flax) and glass fibers, via 1. fiber coating with graphene 2. vacuum infusion of epoxy. Series of samples with 1,3,5,10 layers of flax and fiberglass were prepared and tested at 1 - 40 GHz, showing controllable and tunable shielding efficiency with an average number of 1 gr graphene per dB for 1 sq m of the composite.

The results prove that not only synthetic fibres but even the natural fibers can be used for the composite materials and can be used in the e-transport or aviation industry of the future.