Quantum Dots as Templates for Self-Assembly of Photoswitchable Polymers: Small, Dual-Color Nanoparticles Capable of Facile Photomodulation

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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...

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Autores principales: Díaz, Sebastián A., Giordano, Luciana, Azcárate, Julio César, Jovin, Thomas M., Jares-Erijman, Elizabeth A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Química
Física
polymers
spectral properties
switching properties
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/135509
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-135509
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Física
polymers
spectral properties
switching properties
spellingShingle Química
Física
polymers
spectral properties
switching properties
Díaz, Sebastián A.
Giordano, Luciana
Azcárate, Julio César
Jovin, Thomas M.
Jares-Erijman, Elizabeth A.
Quantum Dots as Templates for Self-Assembly of Photoswitchable Polymers: Small, Dual-Color Nanoparticles Capable of Facile Photomodulation
topic_facet Química
Física
polymers
spectral properties
switching properties
description 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%→70%, and from 12%→55%, respectively).
format Articulo
Articulo
author Díaz, Sebastián A.
Giordano, Luciana
Azcárate, Julio César
Jovin, Thomas M.
Jares-Erijman, Elizabeth A.
author_facet Díaz, Sebastián A.
Giordano, Luciana
Azcárate, Julio César
Jovin, Thomas M.
Jares-Erijman, Elizabeth A.
author_sort Díaz, Sebastián A.
title Quantum Dots as Templates for Self-Assembly of Photoswitchable Polymers: Small, Dual-Color Nanoparticles Capable of Facile Photomodulation
title_short Quantum Dots as Templates for Self-Assembly of Photoswitchable Polymers: Small, Dual-Color Nanoparticles Capable of Facile Photomodulation
title_full Quantum Dots as Templates for Self-Assembly of Photoswitchable Polymers: Small, Dual-Color Nanoparticles Capable of Facile Photomodulation
title_fullStr Quantum Dots as Templates for Self-Assembly of Photoswitchable Polymers: Small, Dual-Color Nanoparticles Capable of Facile Photomodulation
title_full_unstemmed Quantum Dots as Templates for Self-Assembly of Photoswitchable Polymers: Small, Dual-Color Nanoparticles Capable of Facile Photomodulation
title_sort quantum dots as templates for self-assembly of photoswitchable polymers: small, dual-color nanoparticles capable of facile photomodulation
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/135509
work_keys_str_mv AT diazsebastiana quantumdotsastemplatesforselfassemblyofphotoswitchablepolymerssmalldualcolornanoparticlescapableoffacilephotomodulation
AT giordanoluciana quantumdotsastemplatesforselfassemblyofphotoswitchablepolymerssmalldualcolornanoparticlescapableoffacilephotomodulation
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AT jareserijmanelizabetha quantumdotsastemplatesforselfassemblyofphotoswitchablepolymerssmalldualcolornanoparticlescapableoffacilephotomodulation
bdutipo_str Repositorios
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