A Portable Array Visualization Device Integrating Sample Preparation and Detection All-in-One for the On-Site...

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Visual on-site analysis requires integrated sample preparation and detection systems.
• Fluorescent materials offer sensitive detection capabilities.
• Existing methods for volatile gas detection can be time-consuming and complex.

Purpose of the Study:

• To develop a novel gas membrane separation/array fluorescence visualization (GMS/AFV) device.
• To synthesize and characterize hydrazine-based carbonized copolymer dots (PD-N2H4) for visual sensing.
• To demonstrate the device's capability for rapid, on-site detection of volatile gases.

Main Methods:

• Synthesis of PD-N2H4 using a polymer template approach.
• Integration of PD-N2H4 into a GMS/AFV device with a smartphone, sample pretreatment system, and optical system.
• Testing the device with hydrogen sulfide (H2S) as a model analyte.

Main Results:

• The GMS/AFV device successfully performed visual on-site analysis.
• PD-N2H4 exhibited strong blue fluorescence suitable for sensing.
• The device achieved a 3-minute analysis time for H2S with a limit of detection of 3.4 μg/L.
• High-throughput analysis of 48 samples was possible in approximately 20 minutes.

Conclusions:

• The developed GMS/AFV device provides a quick, easy, cheap, and environmentally friendly method for volatile gas analysis.
• The device opens new avenues for on-site detection of complex samples.
• This integrated system demonstrates significant potential for practical applications in environmental monitoring and safety.