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Micro, Volume 6, Issue 2 (June 2026) – 1 article

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15 pages, 9049 KB

Open AccessArticle

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

by Victor Petrov, Timofey Grishin and Alexandra Starnikova

Micro 2026, 6(2), 23; https://doi.org/10.3390/micro6020023 (registering DOI) - 26 Mar 2026

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. Full article

(This article belongs to the Special Issue Functional Micro- and Nanomaterials: Design, Modulation, and Applications in Energy and Sensing)

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Micro, Volume 6, Issue 2 (June 2026) – 1 article

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