Role of potassium loading in ZnO-based gas sensors under NO2 exposure – Operando diffuse reflectance infrared Fourier transform spectroscopic study

Ewald, Carolin; Saito, Noriko; Bârsan, Nicolae

doi:10.1016/j.snb.2023.134321

Sensors and Actuators B: Chemical

2023

DOI: 10.1016/j.snb.2023.134321

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Role of potassium loading in ZnO-based gas sensors under NO2 exposure – Operando diffuse reflectance infrared Fourier transform spectroscopic study

Carolin Ewald

Noriko Saito

Nicolae Bârsan

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2024

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Nitrogen‐Doped Indium Oxide Electrochemical Sensor for Stable and Selective NO₂ Detection

Mo,

Zhu,

Zhang

et al. 2024

Advanced Materials

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Efficient gas sensors are critical for environmental monitoring and industrial safety. While metal oxide semiconductor (MOS) sensors are cost‐effective, they struggle with poor selectivity, high operating temperatures, and limited stability. Electrochemical sensors, though selective and energy‐efficient, face high costs, and stability issues due to precious metal catalysts like platinum on carbon (Pt/C). Herein, a novel, cost‐effective electrochemical sensor using nitrogen‐doped indium oxide In2O3−xN2x/3Vx/3 (0.01≤x≤0.14), synthesized with varying nitriding times is presented. The optimized In2O3 N‐40 min sensor demonstrates a remarkable response current of 771 nA to 10 ppm nitrogen dioxide (NO2) at ambient temperature, with outstanding long‐term stability (over 30 days) and rapid response/recovery times (5/16 s). Compared to Pt/C sensors, it shows 84% and 67% reductions in response and recovery times, respectively, and maintains 98% performance after a month, versus 68% for Pt/C. This cost‐effective sensor presents a promising alternative for electrochemical gas sensing, eliminating the need for precious metal catalysts.

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Nitrogen‐Doped Indium Oxide Electrochemical Sensor for Stable and Selective NO₂ Detection

Mo,

Zhu,

Zhang

et al. 2024

Advanced Materials

View full text Add to dashboard Cite

show abstract

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Role of potassium loading in ZnO-based gas sensors under NO2 exposure – Operando diffuse reflectance infrared Fourier transform spectroscopic study

Cited by 1 publication

References 34 publications

Nitrogen‐Doped Indium Oxide Electrochemical Sensor for Stable and Selective NO₂ Detection

Nitrogen‐Doped Indium Oxide Electrochemical Sensor for Stable and Selective NO₂ Detection

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Role of potassium loading in ZnO-based gas sensors under NO2 exposure – Operando diffuse reflectance infrared Fourier transform spectroscopic study

Cited by 1 publication

References 34 publications

Nitrogen‐Doped Indium Oxide Electrochemical Sensor for Stable and Selective NO2 Detection

Nitrogen‐Doped Indium Oxide Electrochemical Sensor for Stable and Selective NO2 Detection

Contact Info

Product

Resources

About

Nitrogen‐Doped Indium Oxide Electrochemical Sensor for Stable and Selective NO₂ Detection

Nitrogen‐Doped Indium Oxide Electrochemical Sensor for Stable and Selective NO₂ Detection