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Título

Protective ligand shells for luminescent SiO2-coated alloyed semiconductor nanocrystals

AutorAcebrón, María; Galisteo-López, J. F.; Granados, Daniel ; López-Ogalla, Javier; Gallego, José M. ; Otero, Roberto; López, Cefe ; Juárez, Beatriz H.
Palabras claveMicroemulsion
Surface chemistry
Alloyed semiconductor nanocrystals
Colloidal quantum dots
Luminescence quantum yield
Silica encapsulation
Fecha de publicación2015
EditorAmerican Chemical Society
CitaciónACS Applied Materials and Interfaces 7: 6935- 6945 (2015)
Resumen© 2015 American Chemical Society. SiO2 encapsulation of alloyed CdSeZnS nanocrystals (NCs) shows differences in terms of optical properties and luminescence quantum yield, depending on the surface composition, size, and ligand content. In this work, emphasis has been placed on the fine control required to obtain luminescent SiO2 encapsulated NCs by studying the role of oleic acid (OA), stearic acid (SA), and dodecanethiol (DDT) ligands on the alloyed NCs. While the use of anchored DDT molecules is essential to preserve the optical properties, intercalated OA and SA play a critical role for SiO2 nucleation, as stated by 1H NMR (including DOSY and NOESY) spectroscopy. These results emphasize the importance of surface chemistry in NCs; it is crucial to control their reactivity, and therefore their impact, in different applications, from optics to biomedicine.
URIhttp://hdl.handle.net/10261/117002
DOI10.1021/acsami.5b00820
Identificadoresdoi: 10.1021/acsami.5b00820
issn: 1944-8252
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