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<p>Pure and Cu-doped NiO thin films with varying concentrations of Cu were successfully deposited onto glass substrates using the Chemical Bath Deposition technique. X-ray diffraction (XRD) analysis revealed a decrease in crystallite size with increasing Cu doping concentration. Scanning Electron Microscopy (SEM) demonstrated the development of a sheet-like morphology with fewer cracks, indicating the introduction of grains. The optical band gap energy of the films was observed to decrease slightly, ranging from 3.87&#xa0;eV to 3.83&#xa0;eV. The electrical and NO<sub>2</sub> gas sensing properties of the synthesized thin films were assessed, revealing that NiO:Cu (0.3 wt%) exhibits a swift response to NO<sub>2</sub> gas and efficient recovery in its absence. A prototype design based on NiO:Cu (0.3 wt%) was also proposed for the detection of NO<sub>2</sub> gas.</p>

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Gas sensing performance of chemically deposited N iO:Cu thin films towards NO2 gas

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • Th. Ratanjit Singh,
  • L. Raghumani Singh,
  • A. Nabachandra Singh

摘要

Pure and Cu-doped NiO thin films with varying concentrations of Cu were successfully deposited onto glass substrates using the Chemical Bath Deposition technique. X-ray diffraction (XRD) analysis revealed a decrease in crystallite size with increasing Cu doping concentration. Scanning Electron Microscopy (SEM) demonstrated the development of a sheet-like morphology with fewer cracks, indicating the introduction of grains. The optical band gap energy of the films was observed to decrease slightly, ranging from 3.87 eV to 3.83 eV. The electrical and NO2 gas sensing properties of the synthesized thin films were assessed, revealing that NiO:Cu (0.3 wt%) exhibits a swift response to NO2 gas and efficient recovery in its absence. A prototype design based on NiO:Cu (0.3 wt%) was also proposed for the detection of NO2 gas.