Dually fluorescent silica nanoparticles |
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Authors: | Ana Paula Garcia Ferreira Kris Pieter Frans Janssen |
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Affiliation: | a Instituto de Química de São Carlos, Universidade de São Paulo, 13566-590, São Carlos, SP, Brazil b Katholieke Universiteit Leuven, BIOSYST-MeBioS (Mechatronics, Biostatistics and Sensors) Willem de Croylaan 42, B-3001 Leuven, Belgium |
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Abstract: | The cationic dyes 9-aminoacridine (9AA) and safranine (Sf) were entrapped into silica spheres of about 0.2 μm diameter prepared by modified Stöber method. The fluorescent materials are investigated by steady-state and time-resolved emission, in addition of confocal fluorescence microscopy. Silica particles containing 9-aminoacridine (SP9AA) and safranine (SPSf) or both dyes (SPSf9AA) are emissive particles. When both dyes are present in the same particle but loaded in sequential stages 9AA emission is quenched as a consequence of energy transfer from 9AA (donor) to Sf (acceptor). This result suggests that particle growing processes where the acceptor is incorporated first into the core do not prevent donor/acceptor pairs to be close due to an overlay of the concentration gradients of both dyes in a radial core-shell like distribution. |
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Keywords: | Silica spheres Fluorescence Energy transfer 9-aminoacridine |
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