English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/92251
Compartir / Impacto:
Add this article to your Mendeley library MendeleyBASE
Citado 19 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)

Acetyl protected thiol methacrylic polymers as effective ligands to keep quantum dots in luminescent standby mode

Autor Liras, Marta ; Quijada-Garrido, Isabel ; Palacios-Cuesta, Marta; Muñoz-Durieux, Sonia; García Ballesteros, Olga
Fecha de publicación 2014
Citación Polymer Chemistry 5: 433- 442 (2014)
ResumenHerein, we report evidence for the promising potential of 2-(acetylthio)ethylmethacrytale (AcSEMA), a new monomer, which copolymerizes with methyl methacrylate (MMA) by atom transfer radical polymerization (ATRP) leading to well-defined multidentate protected thiol polymer ligands for CdSe QDs capping by simple ligand exchange. Among the different strategies that can be employed for coating QDs, it is found that thioacetylated polymers, in the presence of hydrophobic QDs, are able to replace trioctylphosphine oxide (TOPO) ligands, leading to hybrid CdSe@PMMA nanoparticles without covalent binding of the polymer to the QD surface. These polymer protected QDs exhibit high stability for long periods of time, in a low luminescence standby mode. Moreover, the fluorescence QD activation of these hybrids is easily achieved at any time from thioacetate hydrolysis to free thiol under mild conditions. This subsequent step, which results in the covalent attachment of PMMA thiol groups to the metallic QD surface, produces compact QDs which exhibit amazingly improved photophysical properties, yielding highly photoluminescent new hybrid materials. For comparison, the same procedure was applied to obtain brush-like QDs coated with PMMA obtained by ATRP with a final thioacetate group. It was then established that the multidentate thiolated polymers provide additional protection against external quenchers, such as 4-amino-TEMPO, to a greater extent than the brush-like PMMA coating and the pristine TOPO capping ligand. © 2014 The Royal Society of Chemistry.
URI http://hdl.handle.net/10261/92251
Identificadoresdoi: 10.1039/c3py00987d
issn: 1759-9954
e-issn: 1759-9962
Aparece en las colecciones: (ICTP) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Mostrar el registro completo

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.