Fungal mycelium instead of epoxy resin: compostable printed circuit board developed

Worldwide, discarded electronic toys, computers, or smartphones are becoming increasingly massive amounts of electronic waste. The basis for electronic circuits are printed circuit boards (PCB), which are typically made of glass fiber-reinforced fossil epoxy resin, making them difficult to recycle, let alone biodegrade. A team from TU Bergakademie Freiberg has now presented a fully compostable alternative made from the mycelium of the Aspergillus niger fungus, a byproduct of industrial citric acid production.

Instead of disposing of this biomass waste, the team processes it into a plastic-like material through an innovative process involving molding and air-drying, resulting in a small, approximately 0.5 cm thick plate with a density of 1.23 g/cm³, comparable to the density of conventional printed circuit boards (PCBs). Using direct ink writing or a standard etching process and manual soldering, the researchers were able to deposit electronic components directly onto the fungal plates.