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Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations
Published on: June 23, 2022
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A magneto-fluidic nanoparticle trapping platform for surface-enhanced Raman spectroscopy
Po-Jung Huang1, Haley L Marks2, Gerard L Coté
1Department of Materials Science and Engineering, College Station, Texas 77840, USA.
Biomicrofluidics
|June 28, 2017
Summary
A novel microfluidic device uses magnetic nickel micropads to precisely control plasmonic nanoparticles for enhanced Surface-Enhanced Raman Spectroscopy (SERS). This method improves detection limits and signal uniformity, enabling automated biological sample analysis.
Area of Science:
- Microfluidics and Nanotechnology
- Spectroscopy and Analytical Chemistry
Background:
- Microfluidic devices offer automation potential for biological sample processing.
- Surface-Enhanced Raman Spectroscopy (SERS) requires controlled nanoparticle localization for optimal performance.
Purpose of the Study:
- To develop a microfluidic device for controlled magnetic nanoparticle localization.
- To enhance SERS detection limits and signal uniformity using magnetically activated nickel micropads.
Main Methods:
- Gold-coated silica-encapsulated iron oxide nanoparticles were concentrated using magnetic fields on nickel micropads within a microchannel.
- Optimized microfluidic flow rate (5 μl/min) and magnetic field strength were determined for nanoparticle capture.
Main Results:
- The device achieved over 90% capture efficiency of nanoparticles across five micropads.
- A 10-fold increase in SERS signal intensity was observed compared to other configurations.
- The SERS signal reached a steady state within 30 minutes and the chip was reusable up to three times.
Conclusions:
- Magnetically activated nickel micropads provide precise control over nanoparticle aggregation for enhanced SERS.
- This magneto-fluidic platform facilitates automated, sensitive, and reproducible SERS analysis.
