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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates

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Published on: March 20, 2015

An optofluidic device for surface enhanced Raman spectroscopy.

Miao Wang¹, Nan Jing, I-Hsien Chou

¹Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX 77843-3128, USA.

|May 4, 2007

Summary

We developed a novel optofluidic device that significantly enhances surface-enhanced Raman spectroscopy (SERS) sensitivity. This new method achieves a detection limit better than 10 pM for adenine molecules.

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Area of Science:

Optofluidics
Nanotechnology
Spectroscopy

Background:

Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity for molecular detection.
Conventional SERS methods face limitations in sensitivity and analyte concentration.
Optofluidic devices provide a platform for enhanced molecular analysis.

Purpose of the Study:

To develop an optofluidic device to improve SERS sensitivity.
To create a system for efficient trapping and assembly of nanoparticles and target molecules.
To achieve a lower detection limit for analytes using SERS.

Main Methods:

Fabrication of an optofluidic device with a pinched and step microchannel-nanochannel junction.
Utilizing capillary force for nanoparticle and target molecule assembly into SERS active clusters.
Employing continuous capillary flow to increase analyte and SERS active site concentration.

Main Results:

The optofluidic device achieved an electromagnetic enhancement factor of approximately 10^8.
The device demonstrated superior sensitivity compared to other SERS approaches.
A detection limit better than 10 pM for adenine molecules was achieved.

Conclusions:

The developed optofluidic device significantly enhances SERS sensitivity.
The device enables efficient concentration of analytes and nanoparticles for improved detection.
This approach holds promise for highly sensitive molecular detection applications.