Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials
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ZnO/Zn2SnO4 nanorod heterostructure coatings for effective detection of acetone

C.D. Bui1, S.S. Nalimova1, Z.V. Shomakhov2, A.M. Guketlov2, S.S. Buzovkin1, A.A. Rybina1

1 Saint Petersburg Electrotechnical University «LETI»
2 Kabardino-Balkarian State University named after H.M. Berbekov

DOI: 10.26456/pcascnn/2024.16.794

Original article

Abstract: Type II ZnO/Zn2SnO4 heterostructure was considered for gas sensor applications. ZnO nanorods surrounded by a Zn2SnO4 shell were grown on the surface of BI2 substrate with sputtered electrical contacts (sensor plat-form) by the hydrothermal synthesis method. Gas-sensitive properties were investigated on different gas analytes (isopropanol, ethanol, and acetone) using a combined laboratory setup allowing for resistivity response and electrical impedance spectroscopy measurements. At an operating temperature of 150°C, the sample showed optimum sensitivity to acetone (1000 ppm) and the Ra/Rg ratio reached a value of 11. The variation of the impedance plot based on the results of measurements in the presence of acetone vapors at an operating temperature of 200°C shows consistent changes. This operating temperature showed a clearer optimization compared to other studies where the sensor operating temperature ranged from 300 to 450°C. In addition, the energy band diagram of the ZnO/Zn2SnO4 heterostructure was presented and the acetone detection mechanism was discussed. The structure of the ZnO/Zn2SnO4 nanorods causes an improved response due to the chemisorption of oxygen on the surface of the Zn2SnO4 shells.

Keywords: zinc oxide, zinc stannate, hydrothermal method, gas sensor, acetone detection, ZnO/Zn2SnO4

  • Cong D. Bui – 2nd year postgraduate student, Micro- and Nanoelectronics Department, Saint Petersburg Electrotechnical University «LETI»
  • Svetlana S. Nalimova – Ph. D., Docent, Micro- and Nanoelectronics Department, Saint Petersburg Electrotechnical University «LETI»
  • Zamir V. Shomakhov – Ph. D., Director of the Institute of artificial intelligence and digital technologies, Kabardino-Balkarian State University named after H.M. Berbekov
  • Aslan M. Guketlov – 2nd year graduate student, Department of Electronics and Digital Information Technologies, Kabardino-Balkarian State University named after H.M. Berbekov
  • Sergey S. Buzovkin – 4th year student, Micro- and Nanoelectronics Department, Saint Petersburg Electrotechnical University «LETI»
  • Arina A. Rybina – 4th year student, Micro- and Nanoelectronics Department, Saint Petersburg Electrotechnical University «LETI»

Reference:

Bui, C.D. ZnO/Zn2SnO4 nanorod heterostructure coatings for effective detection of acetone / C.D. Bui, S.S. Nalimova, Z.V. Shomakhov, A.M. Guketlov, S.S. Buzovkin, A.A. Rybina // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2024. — I. 16. — P. 794-804. DOI: 10.26456/pcascnn/2024.16.794. (In Russian).

Full article (in Russian): download PDF file

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