Journal
ACS NANO
Volume 5, Issue 4, Pages 2795-2805Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn103243c
Keywords
FRET; quantum dots; photochromism; amphiphilic polymer; nanoparticle coating
Categories
Funding
- Max Planck Societ
- Argentine agencies ANpCyT
- CONICET
- DFG Centre for the Molecular Physiology of the Brain (DFG CMPB)
- ANpCyT [PICT 2006/01365]
- Kooperation International [ARG 08/019]
- Deutscher Akademischer Austauschdienst [A/09/75106]
- UBA
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A novel surface architecture was developed to generate biocompatible and stable photoswitchable quantum dots (psQDs). Photochromic diheteroarylethenes, which undergo thermally stable photoconversions between two forms with different spectral properties in organic solvents, were covalently linked to an amphiphilic polymer that self-assemble; with the lipophilic chains surrounding commercial hydrophobic core-shell CdSe/ZnS QDs. This strategy creates a small (similar to 7 nm diameter) nanoparticle (NP) that is soluble in aqueous medium. The NP retains and even enhances the desirable properties of the original QD (broad excitation, narrow emission, photostability), but the brightness of its emission can be tailored by light. The modulation of emission monitored by steady-state and time-resolved fluorescence was 35-40%. The psQDs exhibit unprecedented photostability and fatigue resistance over at least 16 cycles of photoconversion.
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