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<p>Room temperature operative NO<sub>2</sub> gas sensor device is fabricated by using facile spin coating techniqueascribed by development ofpolypyrrole (PPy) thin film on glass substrate. Due to its excellent oxidizing properties, NO<sub>2</sub> gas oxidizes the conjugated polymer during sensing process on exposure to humidity and thereby changes the electronic structure of conjugated film. Qualitative and quantitative analysis of as prepared polypyrrole (PPy) thin filmsdone using XRD, FTIR, UV–Vis, TEM, SEM and electrical resistivity measurements. XRD confirmed the amorphous nature of PPy, while SEM revealed a uniform granular morphology. The room-temperature gas-sensing efficiency of PPy films was evaluated for NO<sub>2</sub>, proving rapid response/ recovery time. Sensor response was lower at relative humidity (RH) levels below 50%, and tended to saturate at higher RH values. Cross-sensitivity studies showed that the response of the PPy sensor to 5–20 ppm NO<sub>2</sub> decreased significantly with increasing RH. The sensing mechanism of the PPy sensor device for NO<sub>2</sub> detection at room temperature has also been examined.</p>

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NO2 Gas Sensing of Polypyrrole (PPy) Thin Film with Consequences of Relative Humidity

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Rakesh K. Sonker,
  • Narender Budhiraja,
  • Mahesh Kumar,
  • Urmila Samariya,
  • Igor E. Uflyand

摘要

Room temperature operative NO2 gas sensor device is fabricated by using facile spin coating techniqueascribed by development ofpolypyrrole (PPy) thin film on glass substrate. Due to its excellent oxidizing properties, NO2 gas oxidizes the conjugated polymer during sensing process on exposure to humidity and thereby changes the electronic structure of conjugated film. Qualitative and quantitative analysis of as prepared polypyrrole (PPy) thin filmsdone using XRD, FTIR, UV–Vis, TEM, SEM and electrical resistivity measurements. XRD confirmed the amorphous nature of PPy, while SEM revealed a uniform granular morphology. The room-temperature gas-sensing efficiency of PPy films was evaluated for NO2, proving rapid response/ recovery time. Sensor response was lower at relative humidity (RH) levels below 50%, and tended to saturate at higher RH values. Cross-sensitivity studies showed that the response of the PPy sensor to 5–20 ppm NO2 decreased significantly with increasing RH. The sensing mechanism of the PPy sensor device for NO2 detection at room temperature has also been examined.