Abstract
Temperature monitoring has become fundamental in modern agriculture, requiring small and conformable sensors that can be integrated into plants as wearable devices. Here, the development of a conformable temperature sensor based on thin film has been explored using a copper-based metal–organic framework (MOF), GR-MOF-1, functionalized with poly(3,4 ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS) as the sensitive layer. The composite was directly deposited into interdigitated electrodes (IDEs) made with laser-induced graphene (LIG) engraving on polyimide (PI) strips in the minimum dimensions. The response to temperature was improved in the GR-MOF-1:PEDOT:PSS sensor, where the sensitivity or temperature coefficient , of resistance (TCR) was–0.47%◦C−1, 2.5× better than the pristine PEDOT:PSS used as control. Furthermore, the specificity of the response was evaluated by testing other common interfering parameters, such as relative humidity (RH), and gases frequently present in greenhouses (NH3, CH4, and CO2). GR-MOF-1:PEDOT:PSS sensor exhibited a reduction in the response to these parameters by 0.5 times in comparison with the pristine PEDOT:PSS sensor, suggesting that the MOF plays a crucial role in minimizing cross sensitivity. These results highlight the potential of MOFs and PEDOT:PSS for fabricating sensitive and selective sensors. Moreover, the employed fabrication method enables a scalable production of compact, lightweight, and conformable sensors, enhancing their practicality for precision agriculture and environmental monitoring.