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The Internet of Things (IoT) has revolutionized the requirements for sensors and smart devices, where high performance, power efficiency and low manufacturing costs are mandatory. As a consequence, the research for better performing materials and more cost-effective manufacturing techniques is being performed. This work reports on ink formulations based on nitrogen-doped graphene and environmentally friendly polymers (Polyvinylpyrrolidone (PVP) and Carboxymethyl cellulose (CMC), and their use in fully screen-printed transistors and humidity sensors. The ink formulations were developed using environmentally friendly solvents and showed non-Newtonian behaviour. The N-rGO composites showed a high electrical conductivity of 1.9 ± 0.5 S∙cm −1 , 100 times higher than the reduced graphene oxide (rGO) composites. Fully printed Graphene field effect transistors (GFET) were developed with low operating voltage of < 2 V to be implemented as humidity sensors with the fully a linear response and high sensitivity (4.25 Ω∙%RH −1 as resistive sensor), allowing integration into low-power microcontrollers for sensing applications.
Franco et al. (Thu,) studied this question.