Quaternary Holey Carbon Nanohorns/SnO2/ZnO/PVP Nano-Hybrid as Sensing Element for Resistive-Type Humidity Sensor

In this study, a resistive humidity sensor for moisture detection at room temperature is presented. The thin film proposed as critical sensing element based on quaternary hybrid nanocomposite CNHox//SnO2/ZnO/PVP (oxidated carbon nanohorns–tin oxide–zinc oxide–polyvinylpyrrolidone) the w/w/w/w ratios of 1.5/1/1/1 and 3/1/1/1. structure consists Si/SiO2 dielectric substrate interdigitated transducers (IDT) electrodes, while layer deposited through drop-casting method. Morphology composition layers were investigated scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), diffraction, Raman spectroscopy. Each nanocomposite-based film’s relative (RH) capability was analyzed by applying direct current known intensity between two electrodes measuring voltage difference when varying RH from 0% to 100% in humid nitrogen atmosphere. While CNHox/SnO2/ZnO/PVP has better performance terms sensitivity, employing CNHox//SnO2/ ZnO/PVP 3/1/1/1 (mass ratio) linearity. contribution each component nanocomposites discussed relation their physical chemical properties. Several alternative mechanisms taken into consideration discussed. Based measured results, we presume that impact p-type semiconductor behavior CNHox, conjunction swelling hydrophilic polymer, dominant leads overall increasing resistance film.