CONTROLLED GROWTH OF CDS QUANTUM DOTS

The role of 3-mercaptopropionic acid as a surface anchoring group and the reaction temperature for the controlled growth of CdS crystals was investigated from a one-step aqueous synthesis carried out both at room temperature and using a hydrothermal route. The thiol group of 3-mercaptopropionic acid...

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Autor: REGUERA RUIZ, EDILSO
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2009
País:México
Institución:Instituto Politécnico Nacional
Repositorio:Repositorio Digital del IPN
OAI Identifier:oai:www.repositoriodigital.ipn.mx:123456789/10568
Acceso en línea:http://hdl.handle.net/123456789/14
http://www.repositoriodigital.ipn.mx/handle/123456789/10568
Access Level:acceso abierto
Palabra clave:Quantum
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spelling CONTROLLED GROWTH OF CDS QUANTUM DOTSREGUERA RUIZ, EDILSOQuantumThe role of 3-mercaptopropionic acid as a surface anchoring group and the reaction temperature for the controlled growth of CdS crystals was investigated from a one-step aqueous synthesis carried out both at room temperature and using a hydrothermal route. The thiol group of 3-mercaptopropionic acid forms a relatively strong bond with the cadmium atoms found at the particle surface reducing the crystal growth rate. This leads to the formation of monodisperse crystals of about 2 nm diameter. For a low thermal activation, at room temperature, for instance, the crystal growth is mainly determined by the nucleation process without evidence of a large contribution from Ostwald ripening. When the thermal activation competes with the binding energy for the thiol group to the cadmium atom, the surface shell becomes unstable and the crystals growth involves the coarsening mechanism. Under hydrothermal conditions the radius (r ) for the obtained crystals follows a linear dependence for r 3 versus t (reaction time). The crystal growing process is halted when the colloidal suspension is cooled. An appropriate control for the time and temperature of heating allows crystals of a tailored size to be obtained. The obtained colloidal suspensions of CdS nanocrystals were characterized from optical absorption, high-resolution transmission electron microscopy, and photoluminescence data.Artículo en la Revista Science of Advanced Materials Vol. 1 1-8,2009Science Of Adavanced Materials2012-03-06T23:52:49Z2012-03-06T23:52:49Z2009-08-082013-01-16T08:05:09Z2013-01-16T08:05:09Z2013-01-16info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/123456789/14http://www.repositoriodigital.ipn.mx/handle/123456789/10568reponame:Repositorio Digital del IPNinstname:Instituto Politécnico Nacionalinstacron:IPNeninfo:eu-repo/semantics/openAccessoai:www.repositoriodigital.ipn.mx:123456789/105682026-02-18T16:40:30Z
dc.title.none.fl_str_mv CONTROLLED GROWTH OF CDS QUANTUM DOTS
title CONTROLLED GROWTH OF CDS QUANTUM DOTS
spellingShingle CONTROLLED GROWTH OF CDS QUANTUM DOTS
REGUERA RUIZ, EDILSO
Quantum
title_short CONTROLLED GROWTH OF CDS QUANTUM DOTS
title_full CONTROLLED GROWTH OF CDS QUANTUM DOTS
title_fullStr CONTROLLED GROWTH OF CDS QUANTUM DOTS
title_full_unstemmed CONTROLLED GROWTH OF CDS QUANTUM DOTS
title_sort CONTROLLED GROWTH OF CDS QUANTUM DOTS
dc.creator.none.fl_str_mv REGUERA RUIZ, EDILSO
author REGUERA RUIZ, EDILSO
author_facet REGUERA RUIZ, EDILSO
author_role author
dc.subject.none.fl_str_mv Quantum
topic Quantum
description The role of 3-mercaptopropionic acid as a surface anchoring group and the reaction temperature for the controlled growth of CdS crystals was investigated from a one-step aqueous synthesis carried out both at room temperature and using a hydrothermal route. The thiol group of 3-mercaptopropionic acid forms a relatively strong bond with the cadmium atoms found at the particle surface reducing the crystal growth rate. This leads to the formation of monodisperse crystals of about 2 nm diameter. For a low thermal activation, at room temperature, for instance, the crystal growth is mainly determined by the nucleation process without evidence of a large contribution from Ostwald ripening. When the thermal activation competes with the binding energy for the thiol group to the cadmium atom, the surface shell becomes unstable and the crystals growth involves the coarsening mechanism. Under hydrothermal conditions the radius (r ) for the obtained crystals follows a linear dependence for r 3 versus t (reaction time). The crystal growing process is halted when the colloidal suspension is cooled. An appropriate control for the time and temperature of heating allows crystals of a tailored size to be obtained. The obtained colloidal suspensions of CdS nanocrystals were characterized from optical absorption, high-resolution transmission electron microscopy, and photoluminescence data.
publishDate 2009
dc.date.none.fl_str_mv 2009-08-08
2012-03-06T23:52:49Z
2012-03-06T23:52:49Z
2013-01-16T08:05:09Z
2013-01-16T08:05:09Z
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/123456789/14
http://www.repositoriodigital.ipn.mx/handle/123456789/10568
url http://hdl.handle.net/123456789/14
http://www.repositoriodigital.ipn.mx/handle/123456789/10568
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 Science Of Adavanced Materials
publisher.none.fl_str_mv Science Of Adavanced Materials
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 15.812429

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