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Versatile SERS sensing based on black silicon.

Authors
  • Seniutinas, Gediminas
  • Gervinskas, Gediminas
  • Verma, Roli
  • Gupta, Banshi D
  • Lapierre, Florian
  • Stoddart, Paul R
  • Clark, Felix
  • McArthur, Sally L
  • Juodkazis, Saulius
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Mar 09, 2015
Volume
23
Issue
5
Pages
6763–6772
Identifiers
DOI: 10.1364/OE.23.006763
PMID: 25836894
Source
Medline
License
Unknown

Abstract

Black Si (b-Si) with gold or silver metal coating has been shown to be an extremely effective substrate for surface-enhanced Raman scattering (SERS). Here, we demonstrate that it is also a highly versatile SERS platform, as it supports a wide range of surface functionalizations. In particular, we report the use of a molecularly imprinted polymer (MIP) coating and a hydrophobic coating on b-Si to establish two different sensing modalities. First, using a MIP layer on Au-coated b-Si, we show selective sensing of two closely related varieties of tetracycline. Second, a hydrophobic coating was used to concentrate the analyte adsorbed on gold colloidal nanoparticles, thus increasing the sensitivity of the measurement by an order of magnitude. In this experiment, Au nanoparticles and analyte were mixed just before SERS measurements and were concentrated by drop-drying on the super-hydrophobic b-Si. These approaches are promising for SERS measurements that are sensitive to the aging of bare plasmonic metal-coated substrates.

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