All-Organic Humidity Sensing Films with Electrical Detection Principle Suitable to Biomedical Applications

AbstractThe humidity sensing layer of the molecular (BEDT-TTF)-based metal was chemically deposited on the surface of a polycarbonate (PC) film [BEDT-TTF=bis(ethylenedithio)tetrathia-fulvalene]. The relative humidity (RH) tests carried out at 25 and 40 oC showed that the electrical response of the developed film to RH changes is a well-definite and reproducible signal: the resistance of the film increases by 15% when relative humidity changes from 20 to 90%. The electric transport, electro-mechanical and mechanical properties of the sensing film demonstrate that it has many advantages, some of which ideally comply with the Health Information Technology requirements applicable for sensors, to state a few of them: lightweight, flexibility, electrical detection principle, long-term stability and simple one-stage synthetic procedure carried out at ambient conditions