Highly sensitive, uniform, and reproducible surface-enhanced Raman spectroscopy from hollow Au-Ag alloy nanourchins

Adv Mater. 2014 Apr 16;26(15):2431-9. doi: 10.1002/adma.201305106. Epub 2014 Jan 21.

Abstract

A hierarchical nanoparticle strategy to simultaneously gain super Raman signal amplification, high uniformity, and reproducibility is presented. Using hollow Au-Ag alloy nanourchins, an ultrahigh sensitivity, e.g., down to 1 fM concentrations for DEHP molecule is obtained. A small standard deviation of <10% is achieved by simply dropping and evaporating sub-100 nm nanourchins onto a substrate.

Keywords: hollow Au-Ag alloy; nanourchins; reproducibility; sensitivity; surface-enhanced Raman spectroscopy.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alloys / chemistry*
  • Gold / chemistry*
  • Levodopa / chemistry
  • Metal Nanoparticles / chemistry*
  • Metal Nanoparticles / ultrastructure
  • Oxidation-Reduction
  • Particle Size
  • Silver / chemistry*
  • Spectrum Analysis, Raman

Substances

  • Alloys
  • Silver
  • Levodopa
  • Gold