A Perovskite-Based Paper Microfluidic Sensor for Haloalkane Assays.

Area of Science:

• Materials Science
• Analytical Chemistry
• Environmental Science

Background:

• Haloalkanes pose significant biological and atmospheric risks.
• There is a need for convenient, wearable sensors for haloalkane detection.

Purpose of the Study:

• To develop a paper-based microfluidic sensor for low-cost, high-throughput haloalkane detection.
• To utilize perovskite nanocrystals as sensitive nanoprobe for haloalkane assays.

Main Methods:

• Fabrication of paper-based microfluidic devices.
• Utilizing CsPbX3 (X = Cl, Br, I) perovskite nanocrystals as probes.
• Anion exchange mechanism triggered by haloalkanes (CH2Cl2, CH2Br2).
• Monitoring photoluminescence spectral shifts for concentration determination.
• Employing trialkyl phosphines (TOP) or UV-photon-induced electron transfer for rapid sensing.

Main Results:

• Demonstrated selective and sensitive detection of haloalkanes using perovskite nanocrystals.
• Established a correlation between haloalkane concentration and photoluminescence spectral shifts.
• Achieved fast sensing of haloalkanes via specific chemical pathways.
• Successfully fabricated a multichannel sensor for colorimetric assays.
• Provided experimental insights into the kinetics of anion exchange in perovskite nanocrystals.

Conclusions:

• The developed sensor offers a promising platform for flexible, wearable haloalkane detection.
• This work advances the fundamental understanding of anion-exchanged nanocrystal behavior.
• The sensor technology has potential applications in environmental monitoring and industrial safety.