Push-pull chromophores aggregation in SiO2 sol-gel films doped with silver nanoparticles

Sol-gel films used for second-order non-linear optical applications often contain some organic molecules working as spacers between chromophores with large permanent dipolar moments. The spacers improve the optical quality of the films because they avoid the chromophores aggregation. We propose the...

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Detalles Bibliográficos
Autores: Franco, Alfredo, Brusatin, Giovanna, Guglielmi, Massimo, Renteria Tapia, Victor, Valverde Aguilar, Guadalupe, García Macedo, Jorge
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2011
País:México
Institución:Instituto Politécnico Nacional
Repositorio:Repositorio Digital del IPN
OAI Identifier:oai:www.repositoriodigital.ipn.mx:123456789/10684
Acceso en línea:http://hdl.handle.net/123456789/166
http://www.repositoriodigital.ipn.mx/handle/123456789/10684
Access Level:acceso abierto
Palabra clave:Second harmonic generation
push-pull
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spelling Push-pull chromophores aggregation in SiO2 sol-gel films doped with silver nanoparticlesFranco, AlfredoBrusatin, GiovannaGuglielmi, MassimoRenteria Tapia, VictorValverde Aguilar, GuadalupeGarcía Macedo, JorgeSecond harmonic generationpush-pullSol-gel films used for second-order non-linear optical applications often contain some organic molecules working as spacers between chromophores with large permanent dipolar moments. The spacers improve the optical quality of the films because they avoid the chromophores aggregation. We propose the use of silver nanoparticles as good spacers, instead of organic molecules. In this work the effect of silver nanoparticles on the arrangement of push-pull chromophores inside SiO2 sol-gel films is investigated by UV-vis optical absorption spectroscopy. Key variables for a good performance of spacers are: their polarizability, their concentration with respect to the concentration of the chromophores, as well as the temperature of the system. Disperse Red 1 chromophores, well known push-pull chromophores, arrange themselves forming H-aggregates when they are inside films in high enough concentrations. Those aggregates are clearly detected by UV-vis optical absorption spectroscopy, where they show an absorbance peak close to 404 nm. That peak disappears as the temperature of the films and/or the concentration of the spacers and/or the polarizability of the spacers increase. A possible electrostatic shielding between the chromophores, created by the spacers, makes us to think about the possibility to use metallic nanoparticles as a new kind of molecular spacer.Revista Mexicana de Física2012-03-16T19:52:33Z2012-03-16T19:52:33Z20112013-01-16T09:04:13Z2013-01-16T09:04:13Z2013-01-16info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/123456789/166http://www.repositoriodigital.ipn.mx/handle/123456789/10684reponame:Repositorio Digital del IPNinstname:Instituto Politécnico Nacionalinstacron:IPNeninfo:eu-repo/semantics/openAccessoai:www.repositoriodigital.ipn.mx:123456789/106842026-02-18T16:40:36Z
dc.title.none.fl_str_mv Push-pull chromophores aggregation in SiO2 sol-gel films doped with silver nanoparticles
title Push-pull chromophores aggregation in SiO2 sol-gel films doped with silver nanoparticles
spellingShingle Push-pull chromophores aggregation in SiO2 sol-gel films doped with silver nanoparticles
Franco, Alfredo
Second harmonic generation
push-pull
title_short Push-pull chromophores aggregation in SiO2 sol-gel films doped with silver nanoparticles
title_full Push-pull chromophores aggregation in SiO2 sol-gel films doped with silver nanoparticles
title_fullStr Push-pull chromophores aggregation in SiO2 sol-gel films doped with silver nanoparticles
title_full_unstemmed Push-pull chromophores aggregation in SiO2 sol-gel films doped with silver nanoparticles
title_sort Push-pull chromophores aggregation in SiO2 sol-gel films doped with silver nanoparticles
dc.creator.none.fl_str_mv Franco, Alfredo
Brusatin, Giovanna
Guglielmi, Massimo
Renteria Tapia, Victor
Valverde Aguilar, Guadalupe
García Macedo, Jorge
author Franco, Alfredo
author_facet Franco, Alfredo
Brusatin, Giovanna
Guglielmi, Massimo
Renteria Tapia, Victor
Valverde Aguilar, Guadalupe
García Macedo, Jorge
author_role author
author2 Brusatin, Giovanna
Guglielmi, Massimo
Renteria Tapia, Victor
Valverde Aguilar, Guadalupe
García Macedo, Jorge
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Second harmonic generation
push-pull
topic Second harmonic generation
push-pull
description Sol-gel films used for second-order non-linear optical applications often contain some organic molecules working as spacers between chromophores with large permanent dipolar moments. The spacers improve the optical quality of the films because they avoid the chromophores aggregation. We propose the use of silver nanoparticles as good spacers, instead of organic molecules. In this work the effect of silver nanoparticles on the arrangement of push-pull chromophores inside SiO2 sol-gel films is investigated by UV-vis optical absorption spectroscopy. Key variables for a good performance of spacers are: their polarizability, their concentration with respect to the concentration of the chromophores, as well as the temperature of the system. Disperse Red 1 chromophores, well known push-pull chromophores, arrange themselves forming H-aggregates when they are inside films in high enough concentrations. Those aggregates are clearly detected by UV-vis optical absorption spectroscopy, where they show an absorbance peak close to 404 nm. That peak disappears as the temperature of the films and/or the concentration of the spacers and/or the polarizability of the spacers increase. A possible electrostatic shielding between the chromophores, created by the spacers, makes us to think about the possibility to use metallic nanoparticles as a new kind of molecular spacer.
publishDate 2011
dc.date.none.fl_str_mv 2011
2012-03-16T19:52:33Z
2012-03-16T19:52:33Z
2013-01-16T09:04:13Z
2013-01-16T09:04:13Z
2013-01-16
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/123456789/166
http://www.repositoriodigital.ipn.mx/handle/123456789/10684
url http://hdl.handle.net/123456789/166
http://www.repositoriodigital.ipn.mx/handle/123456789/10684
dc.language.none.fl_str_mv en
language_invalid_str_mv en
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Revista Mexicana de Física
publisher.none.fl_str_mv Revista Mexicana de Física
dc.source.none.fl_str_mv reponame:Repositorio Digital del IPN
instname:Instituto Politécnico Nacional
instacron:IPN
instname_str Instituto Politécnico Nacional
instacron_str IPN
institution IPN
reponame_str Repositorio Digital del IPN
collection Repositorio Digital del IPN
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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