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


Ivanishcheva A.P. Sysoev V.V. Abdullin K.A. Nesterenko A.V. Khubezhov S.A. Petrov V.V.
March 2023Multidisciplinary Digital Publishing Institute (MDPI)

Chemosensors
2023#11Issue 3

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.

electrophysical properties , gas sensor , nanorods , NO2 , ZnO

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Institute of Nanotechnologies, Electronics, and Equipment Engineering, Southern Federal University, Taganrog, 347928, Russian Federation
Research Laboratory of Functional Nanomaterials Technology, Southern Federal University, Shevchenko St. 2, Taganrog, 347922, Russian Federation
Department of Physics, Yuri Gagarin State Technical University of Saratov, Saratov, 410054, Russian Federation
National Nanotechnology Laboratory of Open Type, Al Farabi Kazakh National University, Almaty, 050044, Kazakhstan
Core Shared Research Facility «Physics and Technology of Nanostructures», North Ossetian State University, Vladikavkaz, 362025, Russian Federation
School of Physics and Engineering, ITMO University, St. Petersburg, 191002, Russian Federation

Institute of Nanotechnologies
Research Laboratory of Functional Nanomaterials Technology
Department of Physics
National Nanotechnology Laboratory of Open Type
Core Shared Research Facility «Physics and Technology of Nanostructures»
School of Physics and Engineering

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