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Gold Nanostars For Surface-Enhanced Raman Scattering: Synthesis, Characterization and Optimization.

Christopher G Khoury1, Tuan Vo-Dinh

  • 1Fitzpatrick Institute for Photonics, Duke University, Durham, NC 27708, USA ; Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|August 27, 2013
PubMed
Summary

Researchers synthesized gold nanostars of various sizes for surface-enhanced Raman scattering (SERS) applications. Larger nanostars exhibited altered morphology and optical properties, correlating with SERS efficiency, offering tunable capabilities.

Keywords:
NanostarsPlasmonicsSurface Enhanced Raman Scattering (SERS)p-MercaptoBenzoic Acid (p-MBA)

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Spectroscopy

Background:

  • Gold nanostars are promising nanomaterials for various applications.
  • Controlled synthesis of gold nanostars with specific sizes is crucial for optimizing their properties.
  • Surface-enhanced Raman scattering (SERS) requires efficient substrates for signal amplification.

Purpose of the Study:

  • To report the controlled synthesis of high-yield gold nanostars of varying sizes.
  • To characterize these gold nanostars and investigate their properties for SERS measurements.
  • To explore the correlation between gold nanostar size and SERS efficiency.

Main Methods:

  • High-yield synthesis of gold nanostars (45-116 nm).
  • Characterization using transmission electron microscopy (TEM), scanning electron microscopy (SEM), and UV-Visible absorption spectroscopy.
  • Evaluation of nanostar properties as SERS substrates.

Main Results:

  • Successful synthesis of high-yield gold nanostars with controlled size variation.
  • Morphological changes observed with increasing size, including core size, branch number, and branch aspect ratio.
  • Plasmon band shifts in the NIR region with varying star size, indicating tunable optical properties.
  • Correlation found between nanostar size and SERS enhancement factors, with an average of 5x10^3 for 52-nm nanostars.

Conclusions:

  • Controlled synthesis of gold nanostars is achievable with high yield and size tunability.
  • Nanostar size significantly influences morphology and optical properties, crucial for SERS applications.
  • Gold nanostars demonstrate potential as tunable SERS substrates with size-dependent efficiencies.