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Volume 6
Issue 2
10.3390/micro6020023
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Highly Sensitive CO Sensor Based on ZnO/SnO2 and ZnO/Au Nanorods

by
Victor Petrov
1,*,
Timofey Grishin
2 and
Alexandra Starnikova
1,*
1
Institute of Nanotechnologies, Electronics, and Equipment Engineering, Southern Federal University, Taganrog 347922, Russia
2
Institute of Nanotechnology of Microelectronics of the Russian Academy of Sciences, Moscow 119334, Russia
*
Authors to whom correspondence should be addressed.
Micro 2026, 6(2), 23; https://doi.org/10.3390/micro6020023 (registering DOI)
Submission received: 13 December 2025 / Revised: 14 March 2026 / Accepted: 24 March 2026 / Published: 26 March 2026
(This article belongs to the Special Issue Functional Micro- and Nanomaterials: Design, Modulation, and Applications in Energy and Sensing)
Versions Notes

Abstract

This study investigates the properties of ZnO nanorod-based sensors and ZnO nanorods modified with tin dioxide (ZnO/SnO2) and gold (ZnO/Au) nanoclusters and their response to low concentrations of carbon monoxide (CO). It was demonstrated that the ZnO/SnO2(3) nanorod-based sensor exhibited the highest sensitivity (S = 1.64) to 10 ppm CO, while the ZnO/Au(3) sensor displayed the shortest response (69–207 s) and recovery (203–233 s) times. This behavior can be explained by ZnO/Au and ZnO/SnO2 nanostructures having low activation energies (0.23–0.25 eV) and high potential barrier values (0.37–0.43 eV). Sensors based on ZnO/Au and ZnO/SnO2 nanorods demonstrate sensitivity to 10 ppm CO at 250 °C and at 200 °C. In contrast, ZnO nanorod-based sensors are sensitive to 2 ppm CO at 250 °C.
Keywords: ZnO; ZnO/SnO2; ZnO/Au; nanorods; modification; nanoclusters; gas sensor; carbon monoxide ZnO; ZnO/SnO2; ZnO/Au; nanorods; modification; nanoclusters; gas sensor; carbon monoxide

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MDPI and ACS Style

Petrov, V.; Grishin, T.; Starnikova, A. Highly Sensitive CO Sensor Based on ZnO/SnO2 and ZnO/Au Nanorods. Micro 2026, 6, 23. https://doi.org/10.3390/micro6020023

AMA Style

Petrov V, Grishin T, Starnikova A. Highly Sensitive CO Sensor Based on ZnO/SnO2 and ZnO/Au Nanorods. Micro. 2026; 6(2):23. https://doi.org/10.3390/micro6020023

Chicago/Turabian Style

Petrov, Victor, Timofey Grishin, and Alexandra Starnikova. 2026. "Highly Sensitive CO Sensor Based on ZnO/SnO2 and ZnO/Au Nanorods" Micro 6, no. 2: 23. https://doi.org/10.3390/micro6020023

APA Style

Petrov, V., Grishin, T., & Starnikova, A. (2026). Highly Sensitive CO Sensor Based on ZnO/SnO2 and ZnO/Au Nanorods. Micro, 6(2), 23. https://doi.org/10.3390/micro6020023

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