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<p>Silver–Titania (AgTi) nanocomposites were synthesized via a simple, scalable two-step method and deposited onto custom-fabricated interdigitated electrodes through drop casting. Comprehensive characterization using UV–Vis Spectroscopy, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM) confirmed the formation of well-integrated AgTi nanostructures with favourable properties for gas sensing. At room temperature, the AgTi sensor exhibited high selectivity and sensitivity toward ammonia (NH<sub>3</sub>), with a theoretical detection limit of ~ 8&#xa0;ppm and a rapid response (~ 22&#xa0;s) and recovery (~ 13&#xa0;s) profile. The enhanced performance is attributed to the Schottky junction formed at the Ag–TiO<sub>2</sub> interface, which modulates electron transport and boosts adsorption activity. The low-cost fabrication, ambient operability, and high selectivity position this sensor as a viable candidate for real-time NH<sub>3</sub> monitoring in environmental and industrial settings.</p>

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Silver–titania nanocomposite-based sensor for ammonia gas detection at room temperature

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Pratyush Phukan,
  • Pallabi Boro,
  • Sultana Rijuwana Haque,
  • Arista Gogoi,
  • Suparna Bhattacharjee

摘要

Silver–Titania (AgTi) nanocomposites were synthesized via a simple, scalable two-step method and deposited onto custom-fabricated interdigitated electrodes through drop casting. Comprehensive characterization using UV–Vis Spectroscopy, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM) confirmed the formation of well-integrated AgTi nanostructures with favourable properties for gas sensing. At room temperature, the AgTi sensor exhibited high selectivity and sensitivity toward ammonia (NH3), with a theoretical detection limit of ~ 8 ppm and a rapid response (~ 22 s) and recovery (~ 13 s) profile. The enhanced performance is attributed to the Schottky junction formed at the Ag–TiO2 interface, which modulates electron transport and boosts adsorption activity. The low-cost fabrication, ambient operability, and high selectivity position this sensor as a viable candidate for real-time NH3 monitoring in environmental and industrial settings.