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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Mulvaney, Paul
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Publications (5/5 displayed)
- 2023Determination of the Optical Constants of Gold Nanoparticles from Thin-Film Spectracitations
- 2023Flexible Vanadium Dioxide Photodetectors for Visible to Longwave Infrared Detection at Room Temperaturecitations
- 2019The future of layer-by-layer assembly: A tribute to ACS Nano associate editor Helmuth Möhwaldcitations
- 2013Synthesis of highly luminescent and photo-stable, graded shell CdSe/Cd xZn1-xS nanoparticles by in situ alloyingcitations
- 2010Fabrication of ZnO thin films from nanocrystal inkscitations
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article
Synthesis of highly luminescent and photo-stable, graded shell CdSe/Cd xZn1-xS nanoparticles by in situ alloying
Abstract
<p>We report a facile and robust synthesis of Cd<sub>x</sub>Zn<sub>1-x</sub>S graded shells on CdSe nanoparticles that are prepared by interface alloying between CdS and ZnS shells at elevated temperatures. Alloying provides systematic control over the electronic structure and enables switching between Type-I and quasi-Type-II configurations. Good control of particle shape, shell thickness, and composition is achieved by slowly adding zinc oleate and octane thiol via syringe pump to readily prepared CdSe/CdS particles. The resultant quantum dots exhibit PL quantum yields of up to 97% and superior robustness toward environmental influences and quenching agents. Alloying promotes a blue-shift of both the absorption and PL spectra compared to pure CdSe/CdS particles and an increased Stokes shift, opening a new synthetic pathway to stable, green-emitting core/shell/shell quantum dots. High PL quantum yields are correlated to a narrow distribution of single-particle lifetimes and suppressed fluorescence intermittency. We introduce a new method to characterize the PL intermittency of single quantum dots based on the autocorrelation function of their PL time trajectories.</p>