Ultrasensitive nitric oxide gas sensors based on Ti-doped ZnO nanofilms prepared by RF magnetron sputtering system
Soltabayev B. Ajjaq A. Yergaliuly G. Kadyrov Y. Turlybekuly A. Acar S. Mentbayeva A.
25 August 2023Elsevier Ltd
Journal of Alloys and Compounds
2023#953
It is aimed to explore the advantages of titanium doping and magnetron sputtering as opposed to chemical-based methods on the surficial and electrical characteristics of ZnO films and their gas sensing performance in particular. RF magnetron sputtering was employed to synthesize a pure ZnO nanofilm as a reference and Ti-doped ZnO nanofilms with various Ti contents. The doping process was done by sputtering Ti-doped ZnO targets developed through solid-state reaction, and doping content was determined by EDS analysis. All nanofilms exhibited pure hexagonal wurtzite structure and relatively flat and homogenous surfaces with a clear distribution of nanoparticles in the Ti-doped samples. The observed enhancement in the properties of the nanofilms was reflected in the ultimate performance of the gas sensor. In this regard, the sensor with 1 wt% Ti content showed the best gas sensing performance with an ultra-sensitivity of 1.72 for 1 ppm and 0.9 for 1 ppb NO gas at a relatively low working temperature of 167 °C. The sensor also acquired outstanding stability, quick responsivity, reproducibility and superior selectivity required for NO monitoring.
Gas sensor , Nitric oxide , RF magnetron sputtering , ZnO thin film
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National Laboratory Astana, Nazarbayev University, Astana, 010000, Kazakhstan
Department of Physics, Faculty of Science, Gazi University, Ankara, 06560, Turkey
School of Engineering and Digital Sciences, Nazarbayev University, Astana, 010000, Kazakhstan
National Laboratory Astana
Department of Physics
School of Engineering and Digital Sciences
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