Artículo
Quantum Dots as Templates for Self-Assembly of Photoswitchable Polymers: Small, Dual-Color Nanoparticles Capable of Facile Photomodulation
Diaz, Sebastian Andres; Giordano, Luciana
; Azcárate, Julio César
; Jovin, Tomás; Jares, Elizabeth Andrea
Fecha de publicación:
01/2013
Editorial:
American Chemical Society
Revista:
Journal of the American Chemical Society
ISSN:
0002-7863
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
A photomodulatable amphiphilic polymer has been synthesized with a backbone of poly[isobutylene-alt-maleic anhydride] and pendant dodecyl alkyl chains, Lucifer Yellow (LY) fluorescent probes, and diheteroarylethenes photochromic (PC) groups. The latter serve as reversible UV-activated FRET acceptors for the LY donors. We characterized the spectral and switching properties of the polymer in an organic solvent (CHCl3). In an aqueous medium the polymer forms polymersomes, constituting fluorescence probes ~75 nm in diameter. Self-assembly of the polymer on the surface of a quantum dot (QD) serving as a template creates a dual-color photoswitchable nanoparticle (psNP) with improved properties due to the increase in polymer density and efficiency of PC photoconversion. The psNP exhibits a second QD red emission band that functions as an internal standard requiring only a single excitation wavelength, and is much reduced in size (<20 nm diameter) compared to the polymersomes. The QD template also greatly increases the depth of modulation by photochromic FRET of the LY emission monitored by both steady-state and time-resolved (lifetime) fluorescence (from 20% to 70%, and from 12% to 55%, respectively).
Palabras clave:
Quantum Dots
,
Fret
,
Polymersomes
,
Fluoescence
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Articulos(CIBION)
Articulos de CENTRO DE INVESTIGACIONES EN BIONANOCIENCIAS "ELIZABETH JARES ERIJMAN"
Articulos de CENTRO DE INVESTIGACIONES EN BIONANOCIENCIAS "ELIZABETH JARES ERIJMAN"
Articulos(INIFTA)
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Citación
Diaz, Sebastian Andres; Giordano, Luciana; Azcárate, Julio César; Jovin, Tomás; Jares, Elizabeth Andrea; Quantum Dots as Templates for Self-Assembly of Photoswitchable Polymers: Small, Dual-Color Nanoparticles Capable of Facile Photomodulation; American Chemical Society; Journal of the American Chemical Society; 135; 8; 1-2013; 3208-3217
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