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A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants
Published on: February 19, 2016
A flexible ag/PDMS hemispherical array SERS for rapid "touch-and-wipe" sampling and quantitative screening of
Haoran Zhang1, Jingkun Yuan2, Guoqiang Fang1
1Zhengzhou Advanced Research Institute of Harbin Institute of Technology, Zhengzhou 450000, China; National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin, China.
Summary
A novel flexible sensor using silver nanoparticles on a 3D array offers sensitive detection of contaminants on food surfaces. This surface-enhanced Raman spectroscopy (SERS) platform enables rapid, on-site food safety monitoring.
Area of Science:
- Materials Science
- Analytical Chemistry
- Nanotechnology
Background:
- Developing sensitive and portable analytical platforms is crucial for real-time monitoring.
- Traditional methods often lack the sensitivity or portability for field applications.
- Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity but requires robust substrate design.
Purpose of the Study:
- To develop a highly sensitive, reproducible, and flexible SERS sensing platform.
- To create a hierarchical 3D plasmonic architecture for enhanced hotspot density.
- To enable rapid, non-destructive, and quantitative on-site food safety monitoring.
Main Methods:
- Fabrication of an ordered silver nanoparticle (Ag NPs)-coated polydimethylsiloxane (PDMS) hemispherical array using interfacial self-assembly.
- Transfer of Ag NPs onto a micro-replicated PDMS hemispherical array to form a 3D plasmonic structure.
- Coupling the flexible Ag/PDMS substrate with a portable 1064 nm Raman spectrometer for sample analysis.
Main Results:
- Achieved a high analytical enhancement factor (AEF) of 2.89 × 105.
- Demonstrated efficient "touch-and-wipe" sampling from irregular surfaces like fish skin and apple peels.
- Suppressed fluorescence background from real-world samples for reliable quantification.
- Obtained low detection limits (10-9 M) for crystal violet, thiram, and rhodamine B with excellent reproducibility (RSD 8.52%).
Conclusions:
- The developed 3D SERS platform significantly enhances sensitivity and allows for flexible, direct sampling.
- The sensor is suitable for reliable on-site quantification of contaminants on diverse food surfaces.
- This technology holds immense potential for rapid, non-destructive food safety monitoring in field environments.
