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<p>In this study, we report the fabrication and characterization of a Nickel ion-doped vertical nanorod array network of ZnO, engineered using a chemical bath deposition (CBD) method on a glass substrate for application as a versatile NO₂ gas sensor. The influence of incorporating Ni<sup>2</sup>⁺ ions at various molar percentages into the ZnO nanorod matrix was comprehensively assessed, with a focus on structural, optical, and NO₂ sensing characteristics. The ZnO nanorods doped with 1&#xa0;mol % Ni showed a significant enhancement in NO₂ gas sensing performance, demonstrating high sensitivity, selectivity, and rapid response and recovery times at 200&#xa0;°C. This enhanced performance is attributed to the increased surface area, improved charge carrier mobility, and the catalytic activity of the Ni ions. The sensor’s response to varying concentrations of NO₂ gas was systematically investigated, revealing a linear relationship between gas concentration and sensor response, thereby indicating its potential for practical environmental monitoring applications. Our findings suggest that Ni-doped ZnO nanorod arrays synthesized via CBD represent a promising avenue for the development of efficient, low-cost, and high-performance gas sensors.</p>

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Nickel ion-doped vertical nanorod array network of ZnO engineered by chemical bath deposition for versatile NO2 gas sensor

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Sandip M. Nikam,
  • Tanaji S. Patil,
  • Nilam A. Nimbalkar,
  • Vijay P. Kothavale,
  • Raviraj S. Kamble,
  • Gautam A. Gaikwad,
  • Sagar M. Mane,
  • Jaewoong Lee,
  • Ravindra D. Mane

摘要

In this study, we report the fabrication and characterization of a Nickel ion-doped vertical nanorod array network of ZnO, engineered using a chemical bath deposition (CBD) method on a glass substrate for application as a versatile NO₂ gas sensor. The influence of incorporating Ni2⁺ ions at various molar percentages into the ZnO nanorod matrix was comprehensively assessed, with a focus on structural, optical, and NO₂ sensing characteristics. The ZnO nanorods doped with 1 mol % Ni showed a significant enhancement in NO₂ gas sensing performance, demonstrating high sensitivity, selectivity, and rapid response and recovery times at 200 °C. This enhanced performance is attributed to the increased surface area, improved charge carrier mobility, and the catalytic activity of the Ni ions. The sensor’s response to varying concentrations of NO₂ gas was systematically investigated, revealing a linear relationship between gas concentration and sensor response, thereby indicating its potential for practical environmental monitoring applications. Our findings suggest that Ni-doped ZnO nanorod arrays synthesized via CBD represent a promising avenue for the development of efficient, low-cost, and high-performance gas sensors.