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Open AccessArticle

Density Gradient Selection of Colloidal Silver Nanotriangles for Assembling Dye-Particle Plasmophores

1
iBB-Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
2
Departamento de Física and CICECO, Aveiro Institute of Materials, Universidade de Aveiro, 3810-193 Aveiro, Portugal
3
Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(6), 893; https://doi.org/10.3390/nano9060893
Received: 9 May 2019 / Revised: 7 June 2019 / Accepted: 11 June 2019 / Published: 18 June 2019
(This article belongs to the Special Issue Fluorescence Nanoprobes: From Synthesis to Applications)
A simple method based on sucrose density gradient centrifugation is proposed here for the fractionation of colloidal silver nanotriangles. This method afforded particle fractions with surface plasmon resonances, spanning from red to infrared spectral ranges that could be used to tune optical properties for plasmonic applications. This feature was exemplified by selecting silver nanotriangle samples with spectral overlap with Atto-655 dye’s absorption and emission in order to assemble dye-particle plasmophores. The emission brightness of an individual plasmophore, as characterized by fluorescence correlation spectroscopy, is at least 1000-fold more intense than that of a single Atto-655 dye label, which renders them as promising platforms for the development of fluorescence-based nanosensors. View Full-Text
Keywords: colloidal metal nanoparticles; density gradient centrifugation; plasmonics; fluorescence correlation spectroscopy; plasmophores colloidal metal nanoparticles; density gradient centrifugation; plasmonics; fluorescence correlation spectroscopy; plasmophores
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MDPI and ACS Style

Oliveira-Silva, R.; Sousa-Jerónimo, M.; Botequim, D.; Silva, N.J.O.; Prazeres, D.M.F.; Paulo, P.M.R. Density Gradient Selection of Colloidal Silver Nanotriangles for Assembling Dye-Particle Plasmophores. Nanomaterials 2019, 9, 893.

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