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Negative axicon tip-based fiber optic interferometer cavity sensor for volatile gas sensing.

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    A novel optical fiber sensor using Polydimethylsiloxane (PDMS) effectively detects volatile organic compounds (VOCs) at room temperature. This sensor platform shows promising sensitivity and rapid response times for industrial gas detection applications.

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    Area of Science:

    • Materials Science
    • Chemical Sensing
    • Optical Physics

    Background:

    • Volatile organic compounds (VOCs) pose risks in industrial settings.
    • Accurate and rapid detection of VOCs is crucial for safety and process control.
    • Existing gas sensors often require high temperatures or lack sensitivity.

    Purpose of the Study:

    • To develop and characterize a novel optical fiber sensor for room-temperature VOC detection.
    • To investigate the sensing performance of a Polydimethylsiloxane (PDMS)-filled negative axicon optical fiber tip.
    • To evaluate the sensor's sensitivity, limit of detection, response/recovery times, and thermal stability.

    Main Methods:

    • Fabrication of a negative axicon optical fiber tip sensor.
    • Filling the fiber tip cavity with Polydimethylsiloxane (PDMS).
    • Exposure of the sensor to various VOCs (Chloroform, Hexane, Isopropanol, Acetone, Toluene, Methanol) at different concentrations (5-200 ppm).
    • Measurement of wavelength shifts in the Fabry-Perot Interferometric (FPI) cavity.
    • Analysis of sensor response, sensitivity, limit of detection (LOD), response/recovery times, and thermal stability (30-70 °C).
    • Correlation of PDMS swelling with Hansen Solubility Parameters (HSP).

    Main Results:

    • The sensor demonstrated sensitivity ranging from 23.7 to 3.2 pm/ppm for tested VOCs.
    • Limits of detection (LOD) were observed between 0.84 to 6.10 ppm.
    • Response and recovery times were rapid, ranging from 30-57 seconds and 8-25 seconds, respectively.
    • The sensor exhibited good thermal stability across the tested temperature range (30-70 °C).
    • Experimental PDMS swelling trends agreed with theoretical HSP calculations.

    Conclusions:

    • The developed PDMS-filled negative axicon optical fiber sensor is effective for room-temperature VOC detection.
    • The sensor exhibits high sensitivity, rapid response, and good thermal stability.
    • This technology holds significant potential for industrial gas sensing applications.