SERS platforms of plasmonic hydrophobic surfaces for analyte concentration: Hierarchically assembled gold nanorods on anodized aluminum

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Moritz Tebbe - , University of Bayreuth (Author)
  • Pavel Cherepanov - , University of Bayreuth (Author)
  • Ekaterina V. Skorb - , Max Planck Institute of Colloids and Interfaces, Belarusian State University (Author)
  • Sergey K. Poznyak - , Belarusian State University (Author)
  • Javier García De Abajo - , ICREA, ICFO - Institute of Photonic Sciences (Author)
  • Andreas Fery - , University of Bayreuth (Author)
  • Daria V. Andreeva - , University of Bayreuth (Author)
  • Ramon A.Alvarez Puebla - , ICREA, Universidad Rovira i Virgili (Author)
  • Nicolas Pazos-Perez - , University of Bayreuth, Universidad Rovira i Virgili (Author)

Abstract

Effi cient and homogeneous surface-enhanced Raman scattering (SERS) substrates are usually prepared using lithographic approaches, physical evaporation, or in situ chemical reduction. However, these approaches are time-consuming, expensive, and very diffi cult to upscale. Alternatively, template- assisted approaches using colloidal suspensions of preformed nanoparticles have become more popular because of their low cost, fast production, and ability to be scaled up easily. One of the limitations of these methods is the dimensions of the structured surfaces. In this context, a new method for designing low-cost, up-scalable surface patterns that match building block dimensionality based on anodization of aluminum, enabling a hierarchical organization of anisotropic nanoparticles, is presented. The proposed new technology starts with anodized aluminum oxide with regular parallel linear periodicities. To produce a highly effi cient plasmonic surface, gold nanorods are assembled into parallel lines where the long axes of the Au rods are also oriented along the substrate lines, thus inducing reproducible tip-to-tip plasmonic coupling with the corresponding generation of highly active hotspots. Additionally, this advanced material presents an inherent hydrophobicity that can be exploited as a method for concentration of analytes on the surface. SERS detection is demonstrated with benzenethiol and 2-naphtoic acid.

Details

Original languageEnglish
Pages (from-to)1134-1140
Number of pages7
JournalParticle and Particle Systems Characterization
Volume31
Issue number11
Publication statusPublished - 1 Nov 2014
Peer-reviewedYes
Externally publishedYes