Surface-Enhanced Fluorescence of Erbium Ions on Copper Nanoparticles Containing Tellurite Glasses
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Surface-Enhanced Fluorescence of Erbium Ions on Copper Nanoparticles Containing Tellurite Glasses Tamires Martinhão Machado 1 & Rodrigo Ferreira Falci 2 & Gustavo F. S. Andrade 1 & Maria José Valenzuela Bell 2 & Maurício Antonio Pereira da Silva 1 Received: 9 March 2020 / Accepted: 18 August 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A novel erbium-doped tellurite glass containing copper nanoparticles (CuNP) prepared by a melting-quenching method is reported. The efficient coupling between CuNP and Er3+ ions rendered a strong emission enhancement, reaching maximum values on the order of 10 times for the intensity of the 4I9/2 →4I15/2 and 2H11/2 →4I13/2 transitions, at 794 nm and 805 nm, respectively. The energy transfer mechanism of the coupling between CuNP dipoles and Er3+ ions was also discussed. Keywords Glasses . Copper nanoparticles . Plasmonics . Enhanced photoluminescence . Energy transfer
Introduction Metallic nanoparticles of coinage metals (Ag, Au, and Cu) exhibit the so-called localized surface plasmon resonance (LSPR) phenomenon, based on a coherent excitation mode of free electrons, due to their interaction with the electromagnetic radiation. Since the electrons are confined within the nanoparticle, a surface polarization takes place through an electromagnetically induced displacement of the conduction electrons, due to the intrinsic coupling with the external electromagnetic field [1]. As a consequence, in an optimal resonance condition, large field enhancements near the metallic nanoparticles and thin films are achieved, considerably increasing the number of applications in material science, such as plasmonic sensors and biosensors [2–4]. Zhou et al. developed a high-performance plasmonic sensor based on a two-dimensional metal cavity grating structure, using Ag as the metal, introducing a photonic-enhanced surface plasmon resonance. The detection limit of the ions reached very Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11468-020-01266-9) contains supplementary material, which is available to authorized users. * Tamires Martinhão Machado [email protected] 1
Departamento de Química, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
2
Departamento de Física, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil
low levels (0.002%). The new plasmonic sensor platform showed effectiveness for trace detection of ions and biomolecules [2]. Shi et al. theoretically proposed a new dual-band perfect absorber in the visible and near-infrared regions for sensing applications. The plasmonic sensor consisted of a thick Au film separated from a periodic Au-SiO2-Au shell-core-type nanorod array by a periodic SiO2 nanorod array. The optical properties and electromagnetic field distributions of the absorber were calculated using the three-dimensional finite difference time-domain (FDTD) method. The sensor presented high sensitivity, being promising for applications in plasmonic sensing,
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