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<p>Tin oxide (SnO<sub>2</sub>) nanoparticles have been synthesized by Sol–Gel method. Polypyrrole (PPy)–tin oxide (SnO<sub>2</sub>) hybrid nanocomposite has synthesized by chemical polymerization of PPy in the presence of SnO<sub>2</sub> nanoparticles. The band gap energy of the hybrid nanocomposite is calculated as 3.39&#xa0;eV using UV–VIS absorption spectroscopy. The synthesized SnO<sub>2</sub> nanoparticle is tetragonal rutile structure which has been confirmed using X-ray diffraction spectroscopy. Scanning electron microscope is involved in the morphological analysis of the hybrid nanocomposite. Sensing electrodes are fabricated by spin coating of the sensing material on printed circuit board. The electrodes have been investigated for their sensing behaviour towards oxygen (O<sub>2</sub>), hydrogen (H<sub>2</sub>), ammonia (NH<sub>3</sub>), carbon dioxide (CO<sub>2</sub>) and liquid petroleum gas at room temperature. The fabricated electrode is selectively sensitive to 1&#xa0;ppm of NH<sub>3</sub> with improved sensitivity (55%), response time (20&#xa0;s) and recovery time (8&#xa0;s). The electrode shows stable sensitivity towards NH<sub>3</sub> at different ranges of relative humidity (% RH) (30%, 50% and 80%). The electrode maintains 85.33% stability for the period of 50&#xa0;days.</p>

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Interface engineering of highly sensitive and humidity independent PPy/SnO2 nanocomposites for room temperature ammonia gas detection

  • 期刊论文

  • 发表日期：

    2025年1月31日

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  • A. J. Heiner,
  • S. Imran Hussain

摘要

Tin oxide (SnO2) nanoparticles have been synthesized by Sol–Gel method. Polypyrrole (PPy)–tin oxide (SnO2) hybrid nanocomposite has synthesized by chemical polymerization of PPy in the presence of SnO2 nanoparticles. The band gap energy of the hybrid nanocomposite is calculated as 3.39 eV using UV–VIS absorption spectroscopy. The synthesized SnO2 nanoparticle is tetragonal rutile structure which has been confirmed using X-ray diffraction spectroscopy. Scanning electron microscope is involved in the morphological analysis of the hybrid nanocomposite. Sensing electrodes are fabricated by spin coating of the sensing material on printed circuit board. The electrodes have been investigated for their sensing behaviour towards oxygen (O2), hydrogen (H2), ammonia (NH3), carbon dioxide (CO2) and liquid petroleum gas at room temperature. The fabricated electrode is selectively sensitive to 1 ppm of NH3 with improved sensitivity (55%), response time (20 s) and recovery time (8 s). The electrode shows stable sensitivity towards NH3 at different ranges of relative humidity (% RH) (30%, 50% and 80%). The electrode maintains 85.33% stability for the period of 50 days.