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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
Published on: March 20, 2015
Optical properties of surface-enhanced Raman-active capture matrices.
1SPAWAR Systems Center San Diego, Code 2373, San Diego, California 92152, USA. pam.boss@navy.mil
Applied Spectroscopy
|October 25, 2006
Summary
This study shows that silver and gold nanoparticles on magnetic microparticles exhibit blinking and signal enhancement. This optical property improves the sensitivity of surface-enhanced Raman spectroscopy (SERS) for analyte detection.
Area of Science:
- Nanotechnology
- Surface Chemistry
- Spectroscopy
Background:
- Amine-derivatized magnetic microparticles can immobilize silver and gold colloidal particles.
- These capture matrices are surface-enhanced Raman (SERS) active and can extract analytes.
- Previous work established their utility in analyte extraction.
Purpose of the Study:
- To examine the optical properties of SERS-active magnetic microparticle capture matrices.
- To investigate the blinking behavior of immobilized silver/gold colloidal particles.
- To understand signal enhancement mechanisms for improved sensitivity.
Main Methods:
- Immobilization of silver/gold colloidal particles on magnetic microparticles.
- Formation of self-assembled monolayers (SAMs) using thiols.
- Optical property examination using imaging and SERS.
- Analysis of signal changes under constant laser illumination.
Main Results:
- Immobilized silver/gold colloidal particles displayed blinking behavior.
- A significant increase in SERS signals was observed with constant laser illumination.
- This signal increase is attributed to the electromagnetic enhancement mechanism (EEM).
Conclusions:
- The observed blinking and signal enhancement are key optical properties of these capture matrices.
- The electromagnetic enhancement mechanism (EEM) contributes to improved SERS sensitivity.
- These findings offer potential for more sensitive trace analyte detection.
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