Trapping of Rhodamine 6G excitation energy on cellulose microparticles

Rhodamine 6G (R6G) was adsorbed on cellulose microparticles and fluorescence quantum yields and decays were measured as a function of dye loading. Though no spectroscopic evidence of dye aggregation was found, a noticeable decrease of quantum yield - after correction for reabsorption and reemission...

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Autores principales: López, Sergio Gabriel, Rodríguez, Hernán Bernardo, San Roman, Enrique Arnoldo
Publicado: 2010
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14639076_v12_n9_p2246_Lopez
http://hdl.handle.net/20.500.12110/paper_14639076_v12_n9_p2246_Lopez
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_14639076_v12_n9_p2246_Lopez
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spelling paper:paper_14639076_v12_n9_p2246_Lopez2023-06-08T16:16:22Z Trapping of Rhodamine 6G excitation energy on cellulose microparticles López, Sergio Gabriel Rodríguez, Hernán Bernardo San Roman, Enrique Arnoldo Rhodamine 6G (R6G) was adsorbed on cellulose microparticles and fluorescence quantum yields and decays were measured as a function of dye loading. Though no spectroscopic evidence of dye aggregation was found, a noticeable decrease of quantum yield - after correction for reabsorption and reemission of fluorescence - and shortening of decays were observed at the highest loadings. These effects were attributed to the dissipation of the excitation energy by traps constituted by R6G pairs, leading to static and dynamic quenching produced by direct absorption of traps and non-radiative energy transfer from monomers, respectively. Regarding the nature of traps, two extreme approaches were considered: (a) equilibrium between monomers slightly interacting in the ground state and (b) randomly distributed monomers located below a critical distance (statistical traps). Both approaches accounted quantitatively for the observed facts. The effect of energy migration was evaluated through computational simulations. As the concentration of traps could only be indirectly inferred, in some experiments an external energy transfer quencher, Methylene Blue, was coadsorbed and the results were compared with those obtained with pure R6G. © 2010 the Owner Societies. Fil:López, S.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rodríguez, H.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:San Román, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14639076_v12_n9_p2246_Lopez http://hdl.handle.net/20.500.12110/paper_14639076_v12_n9_p2246_Lopez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Rhodamine 6G (R6G) was adsorbed on cellulose microparticles and fluorescence quantum yields and decays were measured as a function of dye loading. Though no spectroscopic evidence of dye aggregation was found, a noticeable decrease of quantum yield - after correction for reabsorption and reemission of fluorescence - and shortening of decays were observed at the highest loadings. These effects were attributed to the dissipation of the excitation energy by traps constituted by R6G pairs, leading to static and dynamic quenching produced by direct absorption of traps and non-radiative energy transfer from monomers, respectively. Regarding the nature of traps, two extreme approaches were considered: (a) equilibrium between monomers slightly interacting in the ground state and (b) randomly distributed monomers located below a critical distance (statistical traps). Both approaches accounted quantitatively for the observed facts. The effect of energy migration was evaluated through computational simulations. As the concentration of traps could only be indirectly inferred, in some experiments an external energy transfer quencher, Methylene Blue, was coadsorbed and the results were compared with those obtained with pure R6G. © 2010 the Owner Societies.
author López, Sergio Gabriel
Rodríguez, Hernán Bernardo
San Roman, Enrique Arnoldo
spellingShingle López, Sergio Gabriel
Rodríguez, Hernán Bernardo
San Roman, Enrique Arnoldo
Trapping of Rhodamine 6G excitation energy on cellulose microparticles
author_facet López, Sergio Gabriel
Rodríguez, Hernán Bernardo
San Roman, Enrique Arnoldo
author_sort López, Sergio Gabriel
title Trapping of Rhodamine 6G excitation energy on cellulose microparticles
title_short Trapping of Rhodamine 6G excitation energy on cellulose microparticles
title_full Trapping of Rhodamine 6G excitation energy on cellulose microparticles
title_fullStr Trapping of Rhodamine 6G excitation energy on cellulose microparticles
title_full_unstemmed Trapping of Rhodamine 6G excitation energy on cellulose microparticles
title_sort trapping of rhodamine 6g excitation energy on cellulose microparticles
publishDate 2010
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14639076_v12_n9_p2246_Lopez
http://hdl.handle.net/20.500.12110/paper_14639076_v12_n9_p2246_Lopez
work_keys_str_mv AT lopezsergiogabriel trappingofrhodamine6gexcitationenergyoncellulosemicroparticles
AT rodriguezhernanbernardo trappingofrhodamine6gexcitationenergyoncellulosemicroparticles
AT sanromanenriquearnoldo trappingofrhodamine6gexcitationenergyoncellulosemicroparticles
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