Ultrasensitive label-free biomolecular sensing on disk-shaped nanoporous gold nanoparticles in microfluidics

Ming Li, Ji Qi, Jianbo Zeng, Fusheng Zhao, Ulrich Strych, Richard C. Willson, Wei Chuan Shih

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report a novel microfluidic sensing platform enabled by disk-shaped nanoporous gold nanoparticles (NPGNs), representing a unique class of hierarchical plasmonic nanoparticle. NPGNs possess large specific surface area and high-density, internal plasmonic "hot-spots" with impressive electric field enhancement, which greatly promotes plasmon-matter interaction as evidenced by spectral shifts in the surface plasmon resonance. In addition, the plasmonic resonance of disk-shaped NPGNs can be easily tuned from 900 to 1850 nm by changing the disk diameter from 300 to 700 nm. By surface-enhanced Raman scattering, we demonstrate label-free sensing of biomolecules and in situ monitoring of individual DNA hybridization.

Original languageEnglish (US)
Title of host publication18th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2014
PublisherChemical and Biological Microsystems Society
Pages1823-1825
Number of pages3
ISBN (Print)9780979806476
StatePublished - 2014
Event18th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2014 - San Antonio, United States
Duration: Oct 26 2014Oct 30 2014

Other

Other18th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2014
CountryUnited States
CitySan Antonio
Period10/26/1410/30/14

Keywords

  • Label-free
  • Molecular sensing
  • Plasmonics
  • SERS

ASJC Scopus subject areas

  • Control and Systems Engineering

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