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Surface-enhanced Raman spectroscopy using gold-coated horizontally aligned carbon nanotubes.

X N He1, Y Gao, M Mahjouri-Samani

  • 1Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, USA.

Nanotechnology
|May 1, 2012
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Summary

New gold-coated horizontally aligned carbon nanotube (Au-HA-CNT) substrates offer a large surface area for surface-enhanced Raman spectroscopy (SERS). These substrates achieve high enhancement factors for detecting biological molecules like fatty acids and microalgae.

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Area of Science:

  • Nanomaterials Science
  • Spectroscopy
  • Surface Chemistry

Background:

  • Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical technique for molecular detection.
  • Developing efficient and reproducible SERS substrates is crucial for enhancing sensitivity and expanding applications.
  • Horizontally aligned carbon nanotubes (HA-CNTs) offer unique structural properties for substrate fabrication.

Purpose of the Study:

  • To fabricate and characterize gold-coated horizontally aligned carbon nanotube (Au-HA-CNT) substrates for SERS.
  • To evaluate the SERS performance of Au-HA-CNT substrates using model molecules and biological samples.
  • To investigate the enhancement mechanisms and optimize substrate design for maximum signal amplification.

Main Methods:

  • Fabrication of granular Au-HA-CNT substrates with a large SERS-active area.
  • SERS measurements using rhodamine 6G (R6G) as a probe molecule to determine enhancement factors (EFs).
  • Finite-difference time-domain (FDTD) simulations to analyze enhancement mechanisms and electric field distributions.
  • Detection of (13)C- and deuterium (D)-labeled fatty acids and microalgae cells using the developed SERS substrate.

Main Results:

  • Achieved high enhancement factors (EFs) of approximately 10^7 for R6G molecules.
  • Observed maximum SERS enhancement when the incident laser polarization was parallel to the CNT alignment.
  • Demonstrated low limits of detection (LODs) for D-labeled fatty acids (~10 nM) and (13)C-labeled fatty acids (~20 nM).
  • Acquired significantly enhanced Raman signals from microalgae cells, indicating potential for biological sample analysis.

Conclusions:

  • Au-HA-CNT substrates are effective, easy-to-prepare SERS platforms with large active areas.
  • The substrates provide excellent sensitivity and low detection limits for labeled fatty acids.
  • The developed SERS substrates show promise for the sensitive detection and analysis of complex biological samples.