This thesis investigates the inkjet printability of seven sensitive ink formulations for air quality monitoring, conducted within the Horizon Europe project HyPELignum. The inks, based on conductive polymers such as PEDOT:PSS and PPy, were printed using a Drop-on-Demand system and evaluated on various substrates. Most inks achieved stable droplet formation, with velocities between 4.8 and 6.3 m/s and volumes around 4.4 pL. Substrate wettability significantly influenced film morphology. Two inks reached measurable conductivity after multiple layers, with resistances below 10 MΩ, while others remained non-conductive. Higher resolutions improved film uniformity and lateral connectivity. These results support the development of printable, bio-based sensors and contribute to the HyPELignum goal of integrating sustainable electronics into wood-derived systems.
Investigating of Printing Behaviour of Inkjet-Printed Sensitive Layers for Air Quality Monitoring Inks
Freimüller, S. (Author). 2025
Student thesis: Master's Thesis