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

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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.

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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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Authors and Affiliations

  1. Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam

    Pham Nam Thang, Dao Nguyen Thuan, Nguyen Thu Loan, Nguyen Quang Liem & Pham Thu Nga

  2. Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam

    Pham Nam Thang & Pham Thu Nga

  3. Institute of Theoretical and Applied Research, Duy Tan University, Da Nang, 550000, Vietnam

    Le Xuan Hung & Pham Thu Nga

  4. Sorbonne Universités, UPMC Univ Paris 06, UMR 7588, Institut de NanoSciences de Paris (INSP), 75005, Paris, France

    Guillaume Binard, Willy Daney de Marcillac, Agnès Maître & Laurent Coolen

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  1. Pham Nam Thang
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  2. Le Xuan Hung
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Thang, P.N., Hung, L.X., Thuan, D.N. et al. Surface-enhanced Raman scattering from semiconductor and graphene quantum dots coupled to metallic-film-on-nanosphere substrates. Appl. Phys. A 125, 337 (2019). https://doi.org/10.1007/s00339-019-2641-6

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