Dark background-surface enhanced Raman spectroscopic detection of nanoplastics: Thermofluidic strategy

Area of Science:

• Environmental Science
• Analytical Chemistry
• Materials Science

Background:

• Nanoplastics pose a significant threat to aquatic environments.
• Current analytical techniques for nanoplastic detection are limited and lack universal acceptance.
• There is a critical need for efficient and cost-effective detection methods.

Purpose of the Study:

• To develop a novel, time-efficient, and cost-effective method for nanoplastic detection.
• To enable the identification and quantification of nanoplastics in environmental samples.
• To establish a foundation for global nanoplastic mapping and environmental monitoring.

Main Methods:

• Development of a large-area Surface-enhanced Raman scattering (SERS) active substrate.
• Utilized darkfield optical microscopy for nanoplastic detection.
• Point-by-point analysis for single nanoplastic identification.

Main Results:

• Successfully detected nanoplastics using the developed SERS substrate and darkfield microscopy.
• Identified polypropylene (PP) nanoplastics in laboratory equipment.
• Detected polyethylene (PE) nanoplastics from a commercial paper cup and natural nanoplastics in coastal seawater.

Conclusions:

• The developed darkfield-based SERS strategy offers a cost-effective and time-efficient alternative for nanoplastic detection.
• This technique facilitates the identification of nanoplastics in diverse sources, including environmental samples.
• The method holds potential for universal application in global nanoplastic monitoring and research.