Development of a smartphone-based real time cost-effective VOC sensor

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Air pollution from volatile organic compounds (VOCs) is a significant environmental and health concern.
• Developing real-time, sensitive, and cost-effective VOC detection methods is crucial.

Purpose of the Study:

• To design and characterize an inexpensive VOC sensor.
• To utilize fluorescence spectroscopy for VOC detection.
• To enable portable, real-time VOC monitoring using smartphone technology.

Main Methods:

• A Meisenheimer complex derived from picric acid and N,N'-dicyclohexylcarbodiimide was synthesized.
• The sensor material was coated onto a Thin-Layer Chromatography (TLC) plate.
• VOC detection was performed using fluorescence spectroscopy and smartphone imaging.

Main Results:

• The sensor exhibited a distinct color change (deep red to orange) and fluorescence emission shift (no fluorescence to strong yellow) upon exposure to VOCs like benzene, toluene, and xylene.
• The detection limits for various VOCs ranged from 0.7 to 9 ppm.
• A portable, smartphone-based system for real-time VOC detection was successfully demonstrated.

Conclusions:

• The developed Meisenheimer complex-based sensor offers a cost-effective and user-friendly approach for detecting harmful VOCs.
• The integration with smartphone technology facilitates portable and real-time air quality monitoring.
• This sensor technology holds promise for environmental monitoring and personal safety applications.