The effect of copper and zinc oxide additives on the electrical and gas-sensitive properties of tin dioxide composite layers
N.A. Klychkov, V.V. Simakov, I.V. Sinev, D.A. Shikunov
Saratov State University
Abstract: Composite thin films based CuO:SnO2 and ZnO:SnO2 with different impurity concentrations was synthesized by sol-gel method by mixing sols. The films were annealed in oxygen-containing atmosphere at 550°C. A contact system was formed on top of the films by thermal evaporation of chromium, followed by deposition through a mask onto the sample. Based on the temperature dependence of conductivity for layers based on pure tin dioxide, a local maximum of conductivity is observed in the range of 250°C, which is probably due to the thermal activation process of oxygen desorption. Conductivity of SnO2 layers was decreased as the concentration of Cu dopant. 2% Cu additive reduces the long-term conductivity drift by an order of magnitude. Arguably it’s the consequence of occurrence the low mobility complexes created by copper atoms and oxygen vacancies. The best sensitivity to ethanol vapors in all concentration range was shown by 6%Zn doped samples. Accordingly, supplementations of Cu and Zn boost sensitivity of SnO2 layers to ethanol and decrease response time by its impact at 150-300°C range.
Keywords: sol-gel method, composite gas-sensitive layers, tin dioxide, conduction drift, gas sensor’s response time
- Nikita A. Klychkov – Master of Science, Material Sciences, Technologies and Quality Management Department, Saratov State University
- Viacheslav V. Simakov – Dr. Sc., Professor, Material Sciences, Technologies and Quality Management Department, Saratov State University
- Ilya V. Sinev – Ph. D., Associate Professor, Material Sciences, Technologies and Quality Management Department, Saratov State University
- Dmitrii A. Shikunov – Master of Science, Material Sciences, Technologies and Quality Management Department, Saratov State University
Klychkov, N.A. The effect of copper and zinc oxide additives on the electrical and gas-sensitive properties of tin dioxide composite layers / N.A. Klychkov, V.V. Simakov, I.V. Sinev, D.A. Shikunov // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2022. — I. 14. — P. 632-638. DOI: 10.26456/pcascnn/2022.14.632. (In Russian).
Full article (in Russian): download PDF file
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