Synthesis and characterization of water-dispersed CdSe/CdS core-shell quantum dots prepared via layer-by-layer method capped with carboxylic-functionalized poly(vinyl alcohol)
The main goal of this work was to synthesize CdSe/CdS (core-shell) nanoparticles stabilized by polymer ligand using entirely aqueous colloidal chemistry at room temperature. First, the CdSe core was prepared using precursors and acid-functionalized poly(vinyl alcohol) as the capping ligand. Next, a CdS shell was grown onto the CdSe core via the layer-by-layer technique. The CdS shell was formed by two consecutive monolayers, as estimated by empirical mathematical functions. The nucleation and growth of CdSe quantum dots followed by CdS shell deposition were characterized by UV-vis spectroscopy, photoluminescent (PL) spectroscopy and transmission electron microscopy (TEM). The results indicated a systematic red-shift of the absorption and emission spectra after the deposition of CdS, indicating the shell growth onto the CdSe core. TEM coupled with electron diffraction analysis revealed the presence of CdSe/CdS with an epitaxial shell growth. Therefore, it may be concluded that CdSe/CdS quantum dots with core-shell nanostructure were effectively synthesized.
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2014
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oai:scielo:S1516-143920140007000222015-11-06Synthesis and characterization of water-dispersed CdSe/CdS core-shell quantum dots prepared via layer-by-layer method capped with carboxylic-functionalized poly(vinyl alcohol)Ramanery,Fábio PereiraMansur,Alexandra Ancelmo PiscitelliMansur,Herman Sander nanomaterial colloid nanotechnology semiconductor polymer The main goal of this work was to synthesize CdSe/CdS (core-shell) nanoparticles stabilized by polymer ligand using entirely aqueous colloidal chemistry at room temperature. First, the CdSe core was prepared using precursors and acid-functionalized poly(vinyl alcohol) as the capping ligand. Next, a CdS shell was grown onto the CdSe core via the layer-by-layer technique. The CdS shell was formed by two consecutive monolayers, as estimated by empirical mathematical functions. The nucleation and growth of CdSe quantum dots followed by CdS shell deposition were characterized by UV-vis spectroscopy, photoluminescent (PL) spectroscopy and transmission electron microscopy (TEM). The results indicated a systematic red-shift of the absorption and emission spectra after the deposition of CdS, indicating the shell growth onto the CdSe core. TEM coupled with electron diffraction analysis revealed the presence of CdSe/CdS with an epitaxial shell growth. Therefore, it may be concluded that CdSe/CdS quantum dots with core-shell nanostructure were effectively synthesized.info:eu-repo/semantics/openAccessABM, ABC, ABPolMaterials Research v.17 suppl.1 20142014-08-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000700022en10.1590/S1516-14392014005000060 |
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Ramanery,Fábio Pereira Mansur,Alexandra Ancelmo Piscitelli Mansur,Herman Sander |
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Ramanery,Fábio Pereira Mansur,Alexandra Ancelmo Piscitelli Mansur,Herman Sander Synthesis and characterization of water-dispersed CdSe/CdS core-shell quantum dots prepared via layer-by-layer method capped with carboxylic-functionalized poly(vinyl alcohol) |
author_facet |
Ramanery,Fábio Pereira Mansur,Alexandra Ancelmo Piscitelli Mansur,Herman Sander |
author_sort |
Ramanery,Fábio Pereira |
title |
Synthesis and characterization of water-dispersed CdSe/CdS core-shell quantum dots prepared via layer-by-layer method capped with carboxylic-functionalized poly(vinyl alcohol) |
title_short |
Synthesis and characterization of water-dispersed CdSe/CdS core-shell quantum dots prepared via layer-by-layer method capped with carboxylic-functionalized poly(vinyl alcohol) |
title_full |
Synthesis and characterization of water-dispersed CdSe/CdS core-shell quantum dots prepared via layer-by-layer method capped with carboxylic-functionalized poly(vinyl alcohol) |
title_fullStr |
Synthesis and characterization of water-dispersed CdSe/CdS core-shell quantum dots prepared via layer-by-layer method capped with carboxylic-functionalized poly(vinyl alcohol) |
title_full_unstemmed |
Synthesis and characterization of water-dispersed CdSe/CdS core-shell quantum dots prepared via layer-by-layer method capped with carboxylic-functionalized poly(vinyl alcohol) |
title_sort |
synthesis and characterization of water-dispersed cdse/cds core-shell quantum dots prepared via layer-by-layer method capped with carboxylic-functionalized poly(vinyl alcohol) |
description |
The main goal of this work was to synthesize CdSe/CdS (core-shell) nanoparticles stabilized by polymer ligand using entirely aqueous colloidal chemistry at room temperature. First, the CdSe core was prepared using precursors and acid-functionalized poly(vinyl alcohol) as the capping ligand. Next, a CdS shell was grown onto the CdSe core via the layer-by-layer technique. The CdS shell was formed by two consecutive monolayers, as estimated by empirical mathematical functions. The nucleation and growth of CdSe quantum dots followed by CdS shell deposition were characterized by UV-vis spectroscopy, photoluminescent (PL) spectroscopy and transmission electron microscopy (TEM). The results indicated a systematic red-shift of the absorption and emission spectra after the deposition of CdS, indicating the shell growth onto the CdSe core. TEM coupled with electron diffraction analysis revealed the presence of CdSe/CdS with an epitaxial shell growth. Therefore, it may be concluded that CdSe/CdS quantum dots with core-shell nanostructure were effectively synthesized. |
publisher |
ABM, ABC, ABPol |
publishDate |
2014 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392014000700022 |
work_keys_str_mv |
AT ramaneryfabiopereira synthesisandcharacterizationofwaterdispersedcdsecdscoreshellquantumdotspreparedvialayerbylayermethodcappedwithcarboxylicfunctionalizedpolyvinylalcohol AT mansuralexandraancelmopiscitelli synthesisandcharacterizationofwaterdispersedcdsecdscoreshellquantumdotspreparedvialayerbylayermethodcappedwithcarboxylicfunctionalizedpolyvinylalcohol AT mansurhermansander synthesisandcharacterizationofwaterdispersedcdsecdscoreshellquantumdotspreparedvialayerbylayermethodcappedwithcarboxylicfunctionalizedpolyvinylalcohol |
_version_ |
1756420546411626496 |