You need JavaScript to view this

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)

Abstract

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, photoluminescence (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.(author)
Authors:
Ramanery, Fabio Pereira; Mansur, Alexandra Ancelmo Piscitelli; Mansur, Herman Sander, E-mail: hmansur@demet.ufmg.br [1] 
  1. Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Dept. de Metalurgia e Engenharia dos Materiais. Centro de Nanociencia, Nanotecnologia e Inovacao
Publication Date:
Aug 15, 2014
Product Type:
Journal Article
Resource Relation:
Journal Name: Materials Research (Sao Carlos, SP); Journal Volume: 17; Journal Issue: Suppl.1; Conference: CBECIMAT 2012: 20. Brazilian congress of engineering and science of materials, Joinville, SC (Brazil), 4-8 Nov 2012
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; CADMIUM SELENIDES; CADMIUM SULFIDES; COLLOIDS; LAYERS; NANOMATERIALS; PHOTOLUMINESCENCE; POLYMERS; QUANTUM DOTS; SPECTROSCOPY; SYNTHESIS; TRANSMISSION ELECTRON MICROSCOPY; ULTRAVIOLET SPECTRA; WATER
OSTI ID:
22331477
Country of Origin:
Brazil
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1516-1439; TRN: BR1500401037761
Availability:
Available from http://www.scielo.br/pdf/mr/v17s1/aop_matres_225513.pdf
Submitting Site:
BRN
Size:
page(s) 133-140
Announcement Date:
May 13, 2015

Citation Formats

Ramanery, Fabio Pereira, Mansur, Alexandra Ancelmo Piscitelli, and Mansur, Herman Sander, E-mail: hmansur@demet.ufmg.br. 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). Brazil: N. p., 2014. Web. doi:10.1590/S1516-14392014005000060.
Ramanery, Fabio Pereira, Mansur, Alexandra Ancelmo Piscitelli, & Mansur, Herman Sander, E-mail: hmansur@demet.ufmg.br. 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). Brazil. doi:10.1590/S1516-14392014005000060.
Ramanery, Fabio Pereira, Mansur, Alexandra Ancelmo Piscitelli, and Mansur, Herman Sander, E-mail: hmansur@demet.ufmg.br. 2014. "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)." Brazil. doi:10.1590/S1516-14392014005000060. https://www.osti.gov/servlets/purl/10.1590/S1516-14392014005000060.
@misc{etde_22331477,
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)}
author = {Ramanery, Fabio Pereira, Mansur, Alexandra Ancelmo Piscitelli, and Mansur, Herman Sander, E-mail: hmansur@demet.ufmg.br}
abstractNote = {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, photoluminescence (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.(author)}
doi = {10.1590/S1516-14392014005000060}
journal = {Materials Research (Sao Carlos, SP)}
issue = {Suppl.1}
volume = {17}
journal type = {AC}
place = {Brazil}
year = {2014}
month = {Aug}
}