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<p>Acetone detection is essential in industrial, pharmaceutical, and environmental applications due to its toxicity at elevated concentrations. This study reports the fabrication and optical analysis of a D-shaped fiber optic sensor coated with indium tin oxide (ITO, 10&#xa0;nm), gold (Au, 40&#xa0;nm), and bilayer Au: ITO (40:10&#xa0;nm) thin films for room-temperature acetone sensing. The D-shaped geometry was produced via controlled mechanical polishing, while thin films were deposited using high-vacuum electron-beam evaporation. The sensing mechanism is governed by evanescent-field absorption and wavelength-resolved spectral modulation induced by acetone adsorption. Under static testing conditions across 0–870 ppm, the ITO coating achieved a sensitivity of 16 at 350 ppm (LOD = 66 ppm), Au exhibited 14 at 350 ppm (LOD = 75 ppm), and Au: ITO demonstrated 10.2 at 700 ppm (LOD = 205.9 ppm). The bilayer structure enhanced spectral stability at higher gas concentrations. The proposed low-cost, compact, and non-electrical configuration demonstrates strong potential for selective, real-time acetone vapor monitoring in industrial and environmental settings.</p>

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Elucidating the absorption and performance of acetone gas sensor detection using ITO coated D-shape optical fiber at visible region

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月27日

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  • Nur Aina’a Mardhiah Zainuddin,
  • Chew Sue Ping,
  • Latifah Sarah Supian,
  • Sulaiman Wadi Harun,
  • Rozalina Zakaria,
  • Leong Kin Yuen,
  • N. Ayyanar,
  • M. S. Mani Rajan

摘要

Acetone detection is essential in industrial, pharmaceutical, and environmental applications due to its toxicity at elevated concentrations. This study reports the fabrication and optical analysis of a D-shaped fiber optic sensor coated with indium tin oxide (ITO, 10 nm), gold (Au, 40 nm), and bilayer Au: ITO (40:10 nm) thin films for room-temperature acetone sensing. The D-shaped geometry was produced via controlled mechanical polishing, while thin films were deposited using high-vacuum electron-beam evaporation. The sensing mechanism is governed by evanescent-field absorption and wavelength-resolved spectral modulation induced by acetone adsorption. Under static testing conditions across 0–870 ppm, the ITO coating achieved a sensitivity of 16 at 350 ppm (LOD = 66 ppm), Au exhibited 14 at 350 ppm (LOD = 75 ppm), and Au: ITO demonstrated 10.2 at 700 ppm (LOD = 205.9 ppm). The bilayer structure enhanced spectral stability at higher gas concentrations. The proposed low-cost, compact, and non-electrical configuration demonstrates strong potential for selective, real-time acetone vapor monitoring in industrial and environmental settings.