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<p>Quaternary nanocomposites ZnO/CdO/Co<sub>3</sub>O<sub>4</sub>/CuO were prepared using the sol-gel co-precipitation method. A gas sensor was fabricated by the tape casting method on alumina substrate. The XRD confirms the presence of the phase corresponding to each composition, the shift in XRD peaks were observed which exhibited a trend consistent with the O 1s spectra. FESEM micrograph revealed a porous structure for ZCCC2. The BET adsorption isotherm provided a detailed analysis of the specific surface area of the samples and backed the FESEM findings. The O 1s spectra for ZCCC2 showed the maximum adsorbed oxygen on the surface compared to other samples. The sensor with the ZCCC2 sample at 50&#xa0;°C showed a stable response to H<sub>2</sub>S gas, with a sensitivity of 3.4 at 100 ppm with response and recovery times of 38&#xa0;s and 490&#xa0;s, respectively, with the calibration curve of Response = 3.104 Log(C)-2.975. The study resulted in formation of a sensor with high defect density, porous structure and high adsorbed oxygen which resulted in good response at low operating temperature. Effect of humidity was also significantly minimized to ensure the stable operation of the sensor.</p>

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Porous ZnO/CdO/Co3O4/CuO nanocomposite film on alumina substrate for selective H2S gas sensing at low operating temperature

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Akash Rawat,
  • L. P. Purohit

摘要

Quaternary nanocomposites ZnO/CdO/Co3O4/CuO were prepared using the sol-gel co-precipitation method. A gas sensor was fabricated by the tape casting method on alumina substrate. The XRD confirms the presence of the phase corresponding to each composition, the shift in XRD peaks were observed which exhibited a trend consistent with the O 1s spectra. FESEM micrograph revealed a porous structure for ZCCC2. The BET adsorption isotherm provided a detailed analysis of the specific surface area of the samples and backed the FESEM findings. The O 1s spectra for ZCCC2 showed the maximum adsorbed oxygen on the surface compared to other samples. The sensor with the ZCCC2 sample at 50 °C showed a stable response to H2S gas, with a sensitivity of 3.4 at 100 ppm with response and recovery times of 38 s and 490 s, respectively, with the calibration curve of Response = 3.104 Log(C)-2.975. The study resulted in formation of a sensor with high defect density, porous structure and high adsorbed oxygen which resulted in good response at low operating temperature. Effect of humidity was also significantly minimized to ensure the stable operation of the sensor.