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Open AccessArticle

UV-Enhanced Humidity Sensing of Chitosan–SnO2 Hybrid Nanowires

1
Sensor Lab, Department of Information Engineering, University of Brescia, 25123 Brescia, Italy
2
Nano Sensor Systems S. r. l., 25123 Brescia, Italy
3
CNR-IBBR Institute of Biosciences and Bioresources, 50019 Florence, Italy
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(2), 329; https://doi.org/10.3390/nano10020329
Received: 27 January 2020 / Revised: 8 February 2020 / Accepted: 10 February 2020 / Published: 14 February 2020
(This article belongs to the Special Issue Nanostructured Gas Sensors)
The surface of SnO2 nanowires was functionalized by chitosan for the development of room-temperature conductometric humidity sensors. SnO2 nanowires were synthesized by the seed-mediated physical-vapor-deposition (PVD) method. Chitosan layers were deposited on top of the SnO2 nanowires by spin coating. Surface morphology, crystal structure, and optical properties of the synthesized hybrid nanostructure were investigated by scanning electron microscope, grazing incidence X-ray diffraction, and UV–Vis absorption measurements. During electrical conductivity measurements, the hybrid nanostructure showed unusual behavior towards various relative humidity (RH) concentrations (25%, 50%, 75%), under UV-light irradiation, and in dark conditions. The highest sensor responses were recorded towards an RH level of 75%, resulting in 1.1 in the dark and 2.5 in a UV-irradiated chamber. A novel conduction mechanism of hybrid nanowires is discussed in detail by comparing the sensing performances of chitosan film, SnO2 nanowires, and [email protected]2 hybrid nanostructures. View Full-Text
Keywords: chitosan; SnO2; hybrid; nanostructures; room temperature; humidity sensor chitosan; SnO2; hybrid; nanostructures; room temperature; humidity sensor
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MDPI and ACS Style

Sisman, O.; Kaur, N.; Sberveglieri, G.; Núñez-Carmona, E.; Sberveglieri, V.; Comini, E. UV-Enhanced Humidity Sensing of Chitosan–SnO2 Hybrid Nanowires. Nanomaterials 2020, 10, 329.

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