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Atomically Thin Boron Nitride as an Ideal Spacer for Metal-Enhanced Fluorescence

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Download Hi-Res ImageDownload to MS-PowerPointCite This:ACS Nano 2019, 13, 10, 12184-12191
    Article

    Atomically Thin Boron Nitride as an Ideal Spacer for Metal-Enhanced Fluorescence
    Click to copy article linkArticle link copied!

    • Wei Gan
      Wei Gan
      Institute for Frontier Materials, Deakin University Geelong Waurn Ponds Campus, Geelong, Victoria 3216, Australia
      More by Wei Gan
    • Christos Tserkezis
      Christos Tserkezis
      Center for Nano Optics, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
      More by Christos Tserkezis
      Orcidhttp://orcid.org/0000-0002-2075-9036
    • Qiran Cai
      Qiran Cai
      Institute for Frontier Materials, Deakin University Geelong Waurn Ponds Campus, Geelong, Victoria 3216, Australia
      More by Qiran Cai
    • Alexey Falin
      Alexey Falin
      Institute for Frontier Materials, Deakin University Geelong Waurn Ponds Campus, Geelong, Victoria 3216, Australia
      More by Alexey Falin
    • Srikanth Mateti
      Srikanth Mateti
      Institute for Frontier Materials, Deakin University Geelong Waurn Ponds Campus, Geelong, Victoria 3216, Australia
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    • Minh Nguyen
      Minh Nguyen
      School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
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    • Igor Aharonovich
      Igor Aharonovich
      School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
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      Orcidhttp://orcid.org/0000-0003-4304-3935
    • Kenji Watanabe
      Kenji Watanabe
      National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
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    • Takashi Taniguchi
      Takashi Taniguchi
      National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
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    • Fumin Huang
      Fumin Huang
      School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, United Kingdom
      More by Fumin Huang
      Orcidhttp://orcid.org/0000-0001-6489-9818
    • Li Song
      Li Song
      National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230029, China
      More by Li Song
      Orcidhttp://orcid.org/0000-0003-0585-8519
    • Lingxue Kong
      Lingxue Kong
      Institute for Frontier Materials, Deakin University Geelong Waurn Ponds Campus, Geelong, Victoria 3216, Australia
      More by Lingxue Kong
      Orcidhttp://orcid.org/0000-0001-6219-3897
    • Ying Chen
      Ying Chen
      Institute for Frontier Materials, Deakin University Geelong Waurn Ponds Campus, Geelong, Victoria 3216, Australia
      More by Ying Chen
      Orcidhttp://orcid.org/0000-0002-7322-2224
    • Lu Hua Li*
      Lu Hua Li
      Institute for Frontier Materials, Deakin University Geelong Waurn Ponds Campus, Geelong, Victoria 3216, Australia
      *E-mail: [email protected]
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      Orcidhttp://orcid.org/0000-0003-2435-5220
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    ACS Nano

    Cite this: ACS Nano 2019, 13, 10, 12184–12191
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsnano.9b06858
    Published October 2, 2019
    Copyright © 2019 American Chemical Society
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    Abstract

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    Metal-enhanced fluorescence (MEF) considerably enhances the luminescence for various applications, but its performance largely depends on the dielectric spacer between the fluorophore and plasmonic system. It is still challenging to produce a defect-free spacer having an optimized thickness with a sub-nanometer accuracy that enables reusability without affecting the enhancement. In this study, we demonstrate the use of atomically thin hexagonal boron nitride (BN) as an ideal MEF spacer owing to its multifold advantages over the traditional dielectric thin films. With rhodamine 6G as a representative fluorophore, it largely improves the enhancement factor (up to ∼95 ± 5), sensitivity (10–8 M), reproducibility, and reusability (∼90% of the plasmonic activity is retained after 30 cycles of heating at 350 °C in air) of MEF. This can be attributed to its two-dimensional structure, thickness control at the atomic level, defect-free quality, high affinities to aromatic fluorophores, good thermal stability, and excellent impermeability. The atomically thin BN spacers could increase the use of MEF in different fields and industries.

    Copyright © 2019 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsnano.9b06858.

    • Typical AFM images of the exfoliated graphene and BN on 70 nm Ag films and their corresponding PL spectra; SEM images of Ag NPs and corresponding UV–vis spectra; schematics of the models for theoretical calculations; typical PL spectra of R6G, RB on different substrates (PDF)

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    Cited By

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    This article is cited by 25 publications.

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    2. Rakshith Boranna, Chandrika Thondagere Nataraj, Shivananju Bannur Nanjunda, Suman Pahal, Raviprasad Kogravalli Jagannath, Gurusiddappa R. Prashanth. Fluorescence Signal Enhancement by a Spray-Assisted Layer-by-Layer Technique on Aluminum Tape Devices for Biosensing Applications. Langmuir 2022, 38 (10) , 3149-3157. https://doi.org/10.1021/acs.langmuir.1c03186
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    ACS Nano

    Cite this: ACS Nano 2019, 13, 10, 12184–12191
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsnano.9b06858
    Published October 2, 2019
    Copyright © 2019 American Chemical Society
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