Journal ArticleDOI
(CdSe)ZnS Core-Shell Quantum Dots - Synthesis and Characterization of a Size Series of Highly Luminescent Nanocrystallites
B. O. Dabbousi,Javier Rodríguez-Viejo,F. V. Mikulec,Jason Heine,Hedi Mattoussi,R. Ober,K. F. Jensen,‡,§ and,Moungi G. Bawendi +7 more
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In this paper, a synthesis of highly luminescent (CdSe)ZnS composite quantum dots with CdSe cores ranging in diameter from 23 to 55 A was reported.Abstract:
We report a synthesis of highly luminescent (CdSe)ZnS composite quantum dots with CdSe cores ranging in diameter from 23 to 55 A. The narrow photoluminescence (fwhm ≤ 40 nm) from these composite dots spans most of the visible spectrum from blue through red with quantum yields of 30−50% at room temperature. We characterize these materials using a range of optical and structural techniques. Optical absorption and photoluminescence spectroscopies probe the effect of ZnS passivation on the electronic structure of the dots. We use a combination of wavelength dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, small and wide angle X-ray scattering, and transmission electron microscopy to analyze the composite dots and determine their chemical composition, average size, size distribution, shape, and internal structure. Using a simple effective mass theory, we model the energy shift for the first excited state for (CdSe)ZnS and (CdSe)CdS dots with varying shell thickness. Finally, we characterize the...read more
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Platinum-Maghemite Core−Shell Nanoparticles Using a Sequential Synthesis
TL;DR: Pt@Fe2O3 core−shell nanoparticles have been made using a sequential synthetic method as discussed by the authors, and they have been characterized by powder X-ray diffraction, high-resolution transmission electron microscopy, and Xray photo-emission spectroscopy.
Journal ArticleDOI
Semiconductor quantum dots in chemical sensors and biosensors.
TL;DR: This review overviews the design of sensitive and selective nanoprobes, ranging from the type of target molecules to the optical transduction scheme, and discusses towards the most promising directions for future research.
Journal ArticleDOI
Controlled alloying of the core-shell interface in CdSe/CdS quantum dots for suppression of Auger recombination.
Wan Ki Bae,Lazaro A. Padilha,Young-Shin Park,Hunter McDaniel,Istvan Robel,Jeffrey M. Pietryga,Victor I. Klimov +6 more
TL;DR: Results provide direct evidence that the structure of the QD interface has a significant effect on the rate of nonradiative Auger recombination, which dominates biexciton decay.
Journal ArticleDOI
In vivo quantum-dot toxicity assessment
TL;DR: An initial systematic animal toxicity study of CdSe-ZnS core-shell quantum dots in healthy Sprague-Dawley rats is presented and shows that the quantum dot formulations do not cause appreciable toxicity even after their breakdown in vivo over time.
Patent
Semiconductor nanocrystal probes for biological applications and process for making and using such probes
TL;DR: In this paper, a semiconductor nanocrystal compound and probe is described, which is capable of linking to one or more affinity molecules, and it is shown how to construct the probe.
References
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Journal ArticleDOI
Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites
TL;DR: In this paper, a simple route to the production of high-quality CdE (E=S, Se, Te) semiconductor nanocrystallites is presented, based on pyrolysis of organometallic reagents by injection into a hot coordinating solvent.