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SERS decoding of micro gold shells moving in microfluidic systems.

Saram Lee¹, Segyeong Joo, Sejin Park

¹Interdisciplinary Program-Biomedical Engineering Major, Seoul National University, Seoul, Korea.

Electrophoresis

|April 27, 2010

Summary

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Researchers developed a novel microfluidic chip for rapid decoding using surface-enhanced Raman scattering (SERS) with gold shells. This technology enables quick and safe analysis of Raman tags for micro suspension arrays.

Area of Science:

Analytical Chemistry
Materials Science
Nanotechnology

Background:

Microfluidic devices offer miniaturized platforms for chemical analysis.
Surface-enhanced Raman scattering (SERS) provides high sensitivity for molecular detection.
Efficient decoding strategies are crucial for high-throughput assays.

Purpose of the Study:

To demonstrate in situ SERS decoding on a microfluidic chip.
To develop and optimize novel thin micro gold shells for enhanced SERS signals.
To enable rapid and safe decoding of Raman tags in microfluidic systems.

Main Methods:

Fabrication of micro gold shells via electroless gold plating on PMMA beads (15 µm diameter).
Modification of gold shells with Raman tags (e.g., 2-naphthalenethiol, benzenethiol).

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Integration of functionalized shells into a glass microfluidic chip with defined channel dimensions (25 µm depth, 75 µm width).

Main Results:

Optimized micro gold shells achieved maximum SERS intensity.
Well-defined SERS spectra were obtained even at extremely short exposure times (1 ms).
Successful acquisition of consecutive SERS spectra from various Raman tag combinations on moving shells within microchannels.

Conclusions:

The developed micro gold shells enable highly sensitive and rapid SERS decoding.
The proposed strategy shows significant potential for on-chip microfluidic SERS decoding in micro suspension arrays.
This approach facilitates efficient and safe analysis in miniaturized diagnostic platforms.