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Smartphone-Assisted Film Fluorescent Sensor for Quantitative and Visual Detection of Fluoride Ions
Xinyu Ma1,2, Wen Sun2,3, Feng Gao4
1State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730099, China.
Chemistry, an Asian Journal
|July 21, 2025
Summary
A new film sensor detects fluoride ions using color and fluorescence. This portable sensor, based on chitosan-polyvinyl alcohol (CS-PVA) composite film, offers selective detection for real-world applications.
Area of Science:
- Materials Science
- Analytical Chemistry
- Chemical Sensing
Background:
- Fluoride ion (F-) detection is crucial for environmental monitoring and public health.
- Existing detection methods often lack portability, selectivity, or are prone to interference.
- Development of advanced sensor materials is needed for efficient and reliable F- detection.
Purpose of the Study:
- To develop a portable, selective, and dual-mode fluorescent sensor for fluoride ion detection.
- To utilize a chitosan-polyvinyl alcohol (CS-PVA) composite film incorporating an organic fluorophore (DIP).
- To enable quantitative F- detection via colorimetric and ratiometric fluorescence responses.
Main Methods:
- Incorporation of organic fluorophore DIP into a CS-PVA composite film.
- Investigation of photophysical properties of DIP, including near-infrared emission and large Stokes shift.
- Exploitation of F--triggered Si-O cleavage for selective detection mechanism.
- Integration with smartphone technology for visual F- detection using RGB analysis.
Main Results:
- The developed film-based sensor (DIP@CP) demonstrated selective and quantitative detection of fluoride ions.
- Near-infrared emission and large Stokes shift (>139 nm) of DIP minimized background interference.
- The sensor exhibited high selectivity due to the specific F--triggered Si-O cleavage mechanism.
- Successful application in real-world samples, including water and toothpaste, validated the sensor's practicality.
Conclusions:
- The DIP@CP film-based sensor offers a portable and effective solution for fluoride ion detection.
- Dual-mode colorimetric and fluorescent responses provide reliable quantitative analysis.
- Smartphone integration facilitates accessible visual detection, broadening potential applications.
