The Application of Combined Visible and Ultraviolet Irradiation to Improve the Functional Characteristics of Gas Sensors Based on ZnO/SnO2 and ZnO/Au Nanorods

Arrays of zinc oxide (ZnO) nanorods were synthesized over quartz substrates by the hydrothermal method. These nanorods were grown in a predominantly vertical orientation with lengths of 500–800 nm and an average cross-sectional size of 40–80 nm. Gold, with average sizes of 9 ± 1 nm and 4 ± 0.5 nm, a...

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Bibliographic Details
Published in:Chemosensors 2023-03, Vol.11 (3), p.200
Main Authors: Ivanishcheva, Alexandra P., Sysoev, Victor V., Abdullin, Khabibulla A., Nesterenko, Andrey V., Khubezhov, Soslan A., Petrov, Victor V.
Format: Article
Language:English
Subjects:
electrophysical properties
gas sensor
Gas sensors
Gases
Gold
Irradiation
Light emitting diodes
Metal oxides
Metallizing
Nanoclusters
Nanocomposites
Nanoparticles
Nanorods
Nanostructured materials
Nitrates
Nitrogen dioxide
NO2
Photoelectron spectroscopy
Photoelectrons
Radiation
Scanning electron microscopy
Sensors
Substrates
Tin dioxide
Ultraviolet radiation
Vertical orientation
X ray photoelectron spectroscopy
X-ray diffraction
Zinc oxide
Zinc oxides
ZnO
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Summary:Arrays of zinc oxide (ZnO) nanorods were synthesized over quartz substrates by the hydrothermal method. These nanorods were grown in a predominantly vertical orientation with lengths of 500–800 nm and an average cross-sectional size of 40–80 nm. Gold, with average sizes of 9 ± 1 nm and 4 ± 0.5 nm, and tin nanoclusters, with average sizes of 30 ± 5 nm and 15 ± 3 nm, were formed on top of the ZnO nanorods. Annealing was carried out at 300 °C for 2 h to form ZnO/SnO2 and ZnO/Au nanorods. The resulting nanorod-arrayed films were comprehensively studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS). To fabricate resistive sensor elements, the films were supplied with V/Ni contact metallization on top of the nanorods. The gas sensor performance of the prepared films was evaluated at various temperatures in order to select 200 °C as the optimum one which enabled a selective detection of NO2. Adding UV-viz irradiation via a light-emitting diode, λ = 400 nm, allowed us to reduce the working temperature to 50 °C and to advance the detection limit of NO2 to 0.5 ppm. The minimum response time of the samples was 92 s, which is 9 times faster than in studies without exposure to UV-viz radiation.
ISSN:2227-9040
2227-9040
DOI:10.3390/chemosensors11030200