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<p>This study investigates the gas-sensing properties of acetone using two materials: polypyrrole (Ppy) and polypyrrole/silver nitrate (Ppy/AgNO<sub>3</sub>) nanocomposites. These materials were synthesized through a simple, cost-effective, and eco-friendly chemical oxidation polymerization process. Methyl orange was used as a surfactant during the synthesis. The Ppy/AgNO<sub>3</sub> nanocomposites were prepared by incorporating silver nitrate in varying concentrations of 10%, 15%, and 20% by weight into polypyrrole synthesis to enhance the electrical and chemical properties of pure polypyrrole. The structural properties of the synthesized nanocomposites were analyzed using X-ray diffraction, which confirmed their amorphous structure. Field Emission Scanning Electron Microscopy (FESEM) analysis revealed that the nanocomposites were cylindrical in shape. Elemental composition was confirmed through energy-dispersive X-ray Spectroscopy. UV/Vis spectroscopy was employed to assess the light absorption properties of the materials. Fourier Transform Infrared Spectroscopy (FTIR) further confirmed that the composites contained C-H and C-C bonds. The electrical conductivity of Ppy and Ppy/AgNO<sub>3</sub> nanocomposites increased with both temperature and AgNO<sub>3</sub> concentration. The Ppy/AgNO<sub>3</sub> (20 wt%) nanocomposite exhibited the highest response rate of 49.52% at 200 ppm acetone and achieved the fastest response time of 60&#xa0;s at this concentration. The study also examined the effects of selectivity and humidity on the synthesized nanocomposites. It was found that the nanocomposites exhibited the greatest selectivity for acetone, outperforming their responses to CO<sub>2</sub>, hexane, and chloroform. Additionally, the sensing response improved as humidity levels increased. However, the response declined after 180 days. These results suggest that Ppy/AgNO<sub>3</sub> nanocomposites hold great potential for acetone gas sensing. It was also found that Ppy/AgNO<sub>3</sub> hybrid materials offer two main advantages over pure Ppy and AgNO<sub>3</sub>: they provide enhanced selectivity and sensing response, and they operate at significantly lower temperatures.</p>

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Enhanced electrical conductivity and acetone gas sensing properties of Polypyrrole/AgNO3 nanocomposites synthesized via chemical oxidation method

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Dimple Balan,
  • Ravinder Kumar,
  • Chetan Sharma,
  • Devendra Mohan

摘要

This study investigates the gas-sensing properties of acetone using two materials: polypyrrole (Ppy) and polypyrrole/silver nitrate (Ppy/AgNO3) nanocomposites. These materials were synthesized through a simple, cost-effective, and eco-friendly chemical oxidation polymerization process. Methyl orange was used as a surfactant during the synthesis. The Ppy/AgNO3 nanocomposites were prepared by incorporating silver nitrate in varying concentrations of 10%, 15%, and 20% by weight into polypyrrole synthesis to enhance the electrical and chemical properties of pure polypyrrole. The structural properties of the synthesized nanocomposites were analyzed using X-ray diffraction, which confirmed their amorphous structure. Field Emission Scanning Electron Microscopy (FESEM) analysis revealed that the nanocomposites were cylindrical in shape. Elemental composition was confirmed through energy-dispersive X-ray Spectroscopy. UV/Vis spectroscopy was employed to assess the light absorption properties of the materials. Fourier Transform Infrared Spectroscopy (FTIR) further confirmed that the composites contained C-H and C-C bonds. The electrical conductivity of Ppy and Ppy/AgNO3 nanocomposites increased with both temperature and AgNO3 concentration. The Ppy/AgNO3 (20 wt%) nanocomposite exhibited the highest response rate of 49.52% at 200 ppm acetone and achieved the fastest response time of 60 s at this concentration. The study also examined the effects of selectivity and humidity on the synthesized nanocomposites. It was found that the nanocomposites exhibited the greatest selectivity for acetone, outperforming their responses to CO2, hexane, and chloroform. Additionally, the sensing response improved as humidity levels increased. However, the response declined after 180 days. These results suggest that Ppy/AgNO3 nanocomposites hold great potential for acetone gas sensing. It was also found that Ppy/AgNO3 hybrid materials offer two main advantages over pure Ppy and AgNO3: they provide enhanced selectivity and sensing response, and they operate at significantly lower temperatures.