Combination of surface- and interference-enhanced Raman scattering by CuS nanocrystals on nanopatterned Au structures

Alexander G. Milekhin, Nikolay A. Yeryukov, Larisa L. Sveshnikova, Tatyana A. Duda, Ekaterina E. Rodyakina, Victor A. Gridchin, Evgeniya S. Sheremet, Dietrich R.T. Zahn

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We present the results of a Raman study of optical phonons in CuS nanocrystals (NCs) with a low areal density fabricated through the Langmuir-Blodgett technology on nanopatterned Au nanocluster arrays using a combination of surface- and interference-enhanced Raman scattering (SERS and IERS, respectively). Micro-Raman spectra of one monolayer of CuS NCs deposited on a bare Si substrate reveal only features corresponding to crystalline Si. However, a new relatively strong peak occurs in the Raman spectrum of CuS NCs on Au nanocluster arrays at 474cm-1. This feature is related to the optical phonon mode in CuS NCs and manifests the SERS effect. For CuS NCs deposited on a SiO2 layer this phonon mode is also observed due to the IERS effect. Its intensity changes periodically with increasing SiO2 layer thickness for different laser excitation lines and is enhanced by a factor of about 30. CuS NCs formed on Au nanocluster arrays fabricated on IERS substrates combine the advantages of SERS and IERS and demonstrate stronger SERS enhancement allowing for the observation of Raman signals from CuS NCs with an ultra-low areal density.

Original languageEnglish
Pages (from-to)749-754
Number of pages6
JournalBeilstein Journal of Nanotechnology
Volume6
Issue number1
DOIs
Publication statusPublished - 1 Jan 2015
Externally publishedYes

Keywords

  • Copper sulfide (cus) nanocrystals
  • Interference-enhanced Raman spectroscopy
  • Phonons
  • Surface-enhanced Raman spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)
  • Electrical and Electronic Engineering

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