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Applied Physics A

, 125:337 | Cite as

Surface-enhanced Raman scattering from semiconductor and graphene quantum dots coupled to metallic-film-on-nanosphere substrates

  • Pham Nam Thang
  • Le Xuan Hung
  • Dao Nguyen Thuan
  • Nguyen Thu Loan
  • Guillaume Binard
  • Willy Daney de Marcillac
  • Agnès Maître
  • Nguyen Quang Liem
  • Laurent Coolen
  • Pham Thu NgaEmail author
Article
  • 16 Downloads

Abstract

In this article, we perform surface-enhanced Raman scattering (SERS) with a periodically corrugated metallic substrate obtained by evaporating an Ag film onto an artificial opal crystal, which is a self-assembled lattice of SiO2 600-nm spheres. These metallic-film-on-nanosphere (MFON) surfaces are characterized by scanning electron microscopy for different Ag film thicknesses ranging from 44 to 620 nm. Raman scattering spectra are measured for two different types of quantum dots, CdTeSe quantum dots (QDs) and graphene quantum dots (GQDs). We are able to show that enhancement of the Raman spectra can be obtained for all MFON substrates and for both types of QDs. For both CdTeSe and graphene quantum dots, the strongest SERS effect was observed in samples with 135 nm Ag thickness. This is attributed to the formation of hot spots in the nanogap dips of the Ag film.

Notes

Acknowledgements

This research is possible thanks to PICS cooperation project (6456) between CNRS, INSP-UPMC-VAST and funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant number 103.03-2018.03. The authors thank the National Key Laboratory for Electronic Materials and Devices-IMS and Duy Tan University for the use of facilities.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Pham Nam Thang
    • 1
    • 2
  • Le Xuan Hung
    • 3
  • Dao Nguyen Thuan
    • 1
  • Nguyen Thu Loan
    • 1
  • Guillaume Binard
    • 4
  • Willy Daney de Marcillac
    • 4
  • Agnès Maître
    • 4
  • Nguyen Quang Liem
    • 1
  • Laurent Coolen
    • 4
  • Pham Thu Nga
    • 1
    • 2
    • 3
    Email author
  1. 1.Institute of Materials ScienceVietnam Academy of Science and TechnologyHanoiVietnam
  2. 2.Graduate University of Science and TechnologyVietnam Academy of Science and TechnologyHanoiVietnam
  3. 3.Institute of Theoretical and Applied ResearchDuy Tan UniversityDa NangVietnam
  4. 4.Sorbonne Universités, UPMC Univ Paris 06, UMR 7588, Institut de NanoSciences de Paris (INSP)ParisFrance

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