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Wenxing Xu^1,2, Kangbo Zhen^1,2, Wancheng Bao^1,3,4

¹State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.

Analytical Chemistry

|December 19, 2024

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Researchers developed a new near-infrared (NIR) fluorescent thin film for highly sensitive and selective gas detection. This stable material overcomes challenges in detecting biogenic amines, enabling real-time food spoilage monitoring.

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A Polyaniline-based Sensor of Nucleic Acids

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Published on: November 1, 2016

Area of Science:

Organic semiconductor materials
Fluorescent chemosensors
Near-infrared (NIR) spectroscopy

Background:

Thin-film fluorescent chemosensors offer tunable design, high selectivity, and sensitivity for gas detection.
Achieving simultaneous sensitivity, selectivity, and stability (3S attributes) is challenging, especially for NIR gas detection.

Purpose of the Study:

To develop a novel organic semiconductor fluorescent material for enhanced NIR gas detection.
To address the limitations of conventional visible fluorescent materials in gas sensing applications.

Main Methods:

Employed an acceptor-donor-acceptor (A-D-A) molecular design strategy.
Synthesized a NIR fluorescent thin film, C8-IDTT-IC, with peak emission at 790 nm.
Evaluated material properties including selectivity, sensitivity, response time, and optical damage resistance.

Main Results:

The C8-IDTT-IC thin film exhibited excellent resistance to background light and optical damage.
Achieved remarkable selectivity for biogenic amines with a detection limit of 116 ppb.
Demonstrated a rapid response time (<30 s) and low optical damage rate (3% over 1800 s).

Conclusions:

The developed NIR fluorescent material successfully integrates the 3S attributes for gas detection.
The material's practical utility was shown through integration into a hand-held detector for real-time food spoilage monitoring.
This work advances NIR fluorescent thin films for sensitive and stable gas sensing applications.