DSpace
 
  Repositório Institucional da Universidade de Aveiro > Departamento de Química > DQ - Artigos >
 Photoluminescent, transparent and flexible di-ureasil hybrids containing CdSe/ZnS quantum dots
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/5684

title: Photoluminescent, transparent and flexible di-ureasil hybrids containing CdSe/ZnS quantum dots
authors: Neves, Marcia C.
Martins, Manuel A.
Soares-Santos, Paula C. R.
Rauwel, Protima
Ferreira, Rute A. S.
Monteiro, Teresa
Carlos, Luís D.
Trindade, Tito
issue date: Apr-2008
publisher: Institute of Physics
abstract: We describe, in this paper, the sol–gel synthesis of di-ureasil based nanocomposites prepared in situ in the presence of organically capped CdSe quantum dots (QDs) or CdSe QDs which have been coated with a ZnS shell. For the latter a new chemical route to coat the CdSe QDs with ZnS shells was investigated and is now reported. The QDs became well dispersed in the final nanocomposites, whose microstructural homogeneity was evaluated by atomic force microscopy (AFM) and transmission electron microscopy (TEM) analyses. In order to understand the optical behaviour of di-ureasil containing QDs, a detailed photoluminescent study was undertaken for a selected particle size distribution of ZnS coated CdSe QDs (d ∼ 4.5 nm). Emission quantum yields up to 0.11 were measured in the final nanocomposites that present a huge (between 3 and 6 orders of magnitude) increase in the lifetime of the QDs (relative to that of isolated ones), as a result of energy transfer occurring between the intimately mixed di-ureasil host and the QDs.
URI: http://hdl.handle.net/10773/5684
ISSN: 0957-4484
source: Nanotechnology
appears in collectionsCICECO - Artigos
FIS - Artigos
DQ - Artigos
I3N - Artigos

files in this item

file description sizeformat
Nanotechnology 19 (2008) 155601.pdf871.09 kBAdobe PDFview/open
Restrict Access. You can Request a copy!
statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! RCAAP OpenAIRE DeGóis
ria-repositorio@ua.pt - Copyright ©   Universidade de Aveiro - RIA Statistics - Powered by MIT's DSpace software, Version 1.6.2