Abstract
Measuring temperature is crucial, as it affects biological, chemical, and physical processes, impacting climate control, healthcare, and industrial operations. This work introduces a novel flexible and fully printed temperature sensor, based on copper nanoparticle electrodes direct laser written and coated with a screen-printed film of Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) on a paper substrate. The sensor shows a linear response with a sensitivity of -0.15%/°C in the 30-50°C temperature range. Hysteresis evaluation at different humidity levels (30% RH, 50% RH, and 80% RH) reveals the lowest average hysteresis at 50% RH, indicating the most stable and reliable performance at these conditions. Our sensor platform combines the advantages of biocompatible nanomaterials and paper substrates, offering a scalable and ecofriendly solution for temperature sensing, potentially applicable in plant wearable scenarios in precision agriculture.