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      Artefact-free Evaluation of Metal Enhanced Fluorescence in Silica Coated Gold Nanoparticles

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      Scientific Reports
      Nature Publishing Group UK

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          Abstract

          Metal nanoparticles can either quench or enhance the emission of dyes in their vicinity, but the precise measurement and understanding of this effect is still hindered by experimental artifacts, especially for particles in colloidal dispersion. Here, we introduce a new methodology to correct the inner filter effect of the metal on the dye emission. To test the method, we developed new hybrid nanoparticles with a gold core and a silica shell of precise thickness (tuned from 7 to 13 nm), with a high quantum yield perylenediimide dye on the surface. This novel approach effectively avoids fluorescence quenching, allowing us to measure emission enhancements of 5 to 30 times, with no change on the dye fluorescence lifetime. Being able to measure the emission enhancement in dye-metal hybrid nanoparticles in dispersion, free from inner filter and quenching artifacts, offers excellent prospects to guide the development of more efficient fluorescent probes, sensors and photonic devices.

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          Most cited references49

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          A study of the nucleation and growth processes in the synthesis of colloidal gold

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            Gold nanoparticles in chemical and biological sensing.

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              Enhancement and Quenching of Single-Molecule Fluorescence

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                Author and article information

                Contributors
                farinha@tecnico.ulisboa.pt
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                26 May 2017
                26 May 2017
                2017
                : 7
                : 2440
                Affiliations
                ISNI 0000 0001 2181 4263, GRID grid.9983.b, Centro de Química-Física Molecular and Institute of Nanoscience and Nanotechnology, , Instituto Superior Técnico - Universidade de Lisboa, ; Av. Rovisco Pais, 1049-001 Lisboa, Portugal
                Author information
                http://orcid.org/0000-0002-5344-5287
                http://orcid.org/0000-0002-6394-5031
                Article
                2678
                10.1038/s41598-017-02678-0
                5446421
                28550301
                44b2bf55-a0b3-4128-bb79-cfd179dadff2
                © The Author(s) 2017

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 26 July 2016
                : 18 April 2017
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