Work Package 4 (WP4), High Frequency Electronics, focuses on the development of graphene-based electronics technologies operating at gigahertz frequencies and above, capable of significantly outperforming state-of-the-art devices. Work Package leader is Daniel Neumaier of AMO GmbH in Aachen. Deputy leader is Herbert-Zirath from Chalmers University of Technology in Göteborg. Here we highlight two WP4 achievements over the past year.
We live in an increasingly noisy electronic world, with mobile and static devices emitting electromagnetic radiation in the radio-frequency range. Shielding sensitive electronics against radio-frequency interference (RFI) and providing electromagnetic compatibility is critical, and this means searching for and optimising materials that serve such a purpose.
Graphene is a material of interest for RFI shielding, owing to its consistently high conductivity over a wide frequency range, typically from 0-100 gigahertz. Researchers with the flagship's high-frequency electronics work package have come up with a graphene solution to microwave interference1, based on the stacking several layers of the 2d material.
Belarus State University physicist Konstantin Batrakov2 and others found that the conductivity of graphene layers adds arithmetically when they are separated by thin polymer layers. Maximum microwave absorption is achieved with six graphene planes separated by layers of the transparent plastic PMMA, also known as acrylic glass. Furthermore, theoretical work3 by Michaël Lobet and colleagues from the University of Namur has demonstrated that the microwave absorption is not adversely affected by unavoidable defects in the graphene structure.