Sensitivity Enhancement of CO2 Sensors at Room Temperature Based on the CZO Nanorod Architecture
Soltabayev B. Raiymbekov Y. Nuftolla A. Turlybekuly A. Yergaliuly G. Mentbayeva A.
22 March 2024American Chemical Society
ACS Sensors
2024#9Issue 31227 - 1238 pp.
Cobalt-doped ZnO (CZO) thin films were deposited on glass substrates at room temperature by radio frequency (RF) magnetron sputtering of a single target prepared with ZnO and Co3O4 powders. Changes in the crystallinity, morphology, optical properties, and chemical composition of the CZO thin films were investigated at various sputtering powers of 45, 60, and 75 W. All samples presented a hexagonal wurtzite-type structure with a preferential c-axis at the (002) plane, along with a distinct change in the strain values through X-ray diffraction patterns. Scanning electron and atomic force microscopy revealed uniform and dense deposition of nanorod CZO samples with a high surface roughness (RMS). The Hall mobility and carrier concentration increased with the introduction of Co+ ions into the ZnO matrix, as seen from the Hall effect study. The gradual increase of the power applied on the target source significantly affected the morphology of the CZO thin film, which is reflected in the CO2-sensing performance. The best gas response to CO2 was recorded for CZO-60 W with a response of 1.45 for 500 ppm CO2, and the response/recovery times were 72 and 35 s, respectively. The distinguishing feature of the CZO sensor is its ability to effectively and rapidly detect the CO2 target gas at room temperature (∼27 °C, RT).
CO2 sensors , cobalt-doped ZnO , CZO nanorods , gas response , morphology control , RF magnetron sputtering , room-temperature sensing , thin film deposition
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National Laboratory Astana, Nazarbayev University, Astana, 010000, Kazakhstan
Department of Chemical and Materials Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana, 010000, Kazakhstan
Faculty of Physics and Technology, L.N. Gumilyov Eurasian National University, Astana, 010000, Kazakhstan
National Laboratory Astana
Department of Chemical and Materials Engineering
Faculty of Physics and Technology
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