The surface of SnO2 nanowires was functionalized by chitosan for the development ofroom-temperature conductometric humidity sensors. SnO2 nanowires were synthesized by theseed-mediated physical-vapor-deposition (PVD) method. Chitosan layers were deposited on top ofthe SnO2 nanowires by spin coating. Surface morphology, crystal structure, and optical properties ofthe synthesized hybrid nanostructure were investigated by scanning electron microscope, grazingincidence X-ray diraction, and UV-Vis absorption measurements. During electrical conductivitymeasurements, the hybrid nanostructure showed unusual behavior towards various relative humidity(RH) concentrations (25%, 50%, 75%), under UV-light irradiation, and in dark conditions. The highestsensor responses were recorded towards an RH level of 75%, resulting in 1.1 in the dark and 2.5in a UV-irradiated chamber. A novel conduction mechanism of hybrid nanowires is discussed indetail by comparing the sensing performances of chitosan film, SnO2 nanowires, and chitosan@SnO2hybrid nanostructures.
UV-Enhanced Humidity Sensing of Chitosan-SnO2 Hybrid Nanowires
Giorgio Sberveglieri;Nunez Carmona E.;Veronica Sberveglieri;Elisabetta Comini
2020
Abstract
The surface of SnO2 nanowires was functionalized by chitosan for the development ofroom-temperature conductometric humidity sensors. SnO2 nanowires were synthesized by theseed-mediated physical-vapor-deposition (PVD) method. Chitosan layers were deposited on top ofthe SnO2 nanowires by spin coating. Surface morphology, crystal structure, and optical properties ofthe synthesized hybrid nanostructure were investigated by scanning electron microscope, grazingincidence X-ray diraction, and UV-Vis absorption measurements. During electrical conductivitymeasurements, the hybrid nanostructure showed unusual behavior towards various relative humidity(RH) concentrations (25%, 50%, 75%), under UV-light irradiation, and in dark conditions. The highestsensor responses were recorded towards an RH level of 75%, resulting in 1.1 in the dark and 2.5in a UV-irradiated chamber. A novel conduction mechanism of hybrid nanowires is discussed indetail by comparing the sensing performances of chitosan film, SnO2 nanowires, and chitosan@SnO2hybrid nanostructures.| File | Dimensione | Formato | |
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Descrizione: UV-Enhanced Humidity Sensing of Chitosan-SnO2 Hybrid Nanowires
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