Humidity Sensing Properties of Paper Substrates and Their Passivation with ZnO Nanoparticles for Sensor Applications. - Georgios Niarchos; Georges Dubourg; Georgios Afroudakis; Markos Georgopoulos; Vasiliki Tsouti; Eleni Makarona; Vesna Crnojevic-Bengin; Christos Tsamis (Sensors, 2017)