Work

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

Year: 2025

Type: article

Abstract: 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.

Source: Optical and Quantum Electronics

DOI: 10.1007/s11082-025-08584-4