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Fluorescence lifetime imaging for explosive detection.

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    This study introduces a new sensor for detecting explosive vapors using organic semiconductor films. The system offers improved spatial and temporal resolution for enhanced chemical detection in security and demining applications.

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    Area of Science:

    • Materials Science
    • Sensor Technology
    • Analytical Chemistry

    Background:

    • Existing explosive vapor detection systems often lack integrated spatial and temporal resolution.
    • Monitoring fluorescence intensity and lifetime is crucial for accurate chemical identification.
    • Previous methods typically provide either spatial or temporal information, but not both simultaneously.

    Purpose of the Study:

    • To develop a novel sensor system for detecting explosive vapors with high spatial and temporal resolution.
    • To utilize a single-photon avalanche diode (SPAD) sensor array coupled with organic semiconductor films.
    • To enable pixel-by-pixel monitoring of fluorescence intensity and lifetime for improved chemical fingerprinting.

    Main Methods:

    • A time-resolved 120 × 128 pixel SPAD sensor was employed.
    • An array of organic semiconductor films was arranged in a 2 × 2 grid.
    • The sensor's spatial and temporal resolution allowed for monitoring fluorescence intensity and lifetime on a per-pixel basis.

    Main Results:

    • The system successfully detected vapors of DNT (2,4-dinitrotoluene).
    • Distinct responses were observed for each of the four polymer films, indicating selective detection.
    • The sensor demonstrated the capability for spatially resolved fluorescence lifetime imaging.

    Conclusions:

    • The developed sensor system offers significant advancements over previous technologies by integrating spatial and temporal resolution.
    • This technology has strong potential for creating portable chemical fingerprinting tools.
    • Applications include security screening and humanitarian demining efforts for explosive detection.