Homogenous high enhancement surface-enhanced Raman scattering (SERS) substrates by simple hierarchical tuning of gold nanofoams

Hanna J. Koster, Hannah J. O'Toole, Kwan Lun Chiu, Tatu Rojalin, Randy P. Carney

Research output: Contribution to journalArticlepeer-review

Abstract

Surface enhanced Raman scattering (SERS) is a powerful tool for vibrational spectroscopy, providing orders of magnitude increase in chemical sensitivity compared to spontaneous Raman scattering. Yet it remains a challenge to synthesize robust, uniform SERS substrates quickly and easily. Lithographic approaches to produce substrates can achieve high, uniform sensitivity but are expensive and complex, thus difficult to scale. Facile solution-phase chemical approaches often result in unreliable SERS substrates due to heterogeneous arrangement of “hot spots” throughout the material. Here we demonstrate the synthesis and characterization of a homogeneous gold nanofoam (AuNF) substrate produced by a rapid, one-pot, four-ingredient synthetic approach. AuNFs are rapidly nucleated with macroscale porosity and then chemically roughened to produce nanoscale features that confer homogeneous and high signal enhancement (~109) across large areas, a comparable performance to lithographically produced substrates.

Original languageEnglish (US)
Article number100596
JournalColloids and Interface Science Communications
Volume47
DOIs
StatePublished - Mar 2022
Externally publishedYes

Keywords

  • Biosensor
  • Lithography
  • Nanomaterials
  • Plasmonics
  • Raman spectroscopy

ASJC Scopus subject areas

  • Biotechnology
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry
  • Materials Chemistry

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