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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Journal ArticleDOI
Three-dimensional atomic imaging of colloidal core-shell nanocrystals.
Sara Bals,Marianna Casavola,Marijn A. van Huis,Marijn A. van Huis,Sandra Van Aert,K. Joost Batenburg,K. Joost Batenburg,Gustaaf Van Tendeloo,Daniël Vanmaekelbergh +8 more
TL;DR: This work provides a trustful 3D characterization at the atomic scale of a free-standing PbSe(core)-CdSe(shell) nanocrystal by combining electron microscopy and discrete tomography, and yields unique insights for understanding the process of cation exchange.
Book ChapterDOI
Organic/Inorganic Composite Latexes: The Marriage of Emulsion Polymerization and Inorganic Chemistry
TL;DR: A review article describes recent advances in the synthesis and properties of waterborne organic/inorganic colloids elaborated through conventional emulsion polymerization, a well-established technology as discussed by the authors, which can be defined as aqueous suspensions of composite latex particles made up of organic and inorganic domains organized into well defined core-shell, multinuclear, raspberry-like, multipod-like or armored morphologies.
Patent
Monodisperse core/shell and other complex structured nanocrystals and methods of preparing the same
TL;DR: In this article, the authors provide new compositions containing nearly monodisperse colloidal core/shell semiconductor nanocrystals with high photoluminescence quantum yields (PL QY), as well as other complex structured semiconductor nano-structures.
Journal ArticleDOI
Quenching of Photoluminescence in Conjugates of Quantum Dots and Single-Walled Carbon Nanotube
TL;DR: The FRET efficiency in QD-SWCNT conjugates is estimated from the quenching of the PL intensity and lifetime and it is identified that FRET is independent of the density and type of QDs on SWCNT but inherent to QD
Journal ArticleDOI
Highly efficient triggered emission of single photons by colloidal CdSe∕ZnS nanocrystals
TL;DR: In this paper, the authors demonstrate the realization of a highly efficient triggered source of single photons emitted by colloidal CdSe∕ZnS nanocrystals at room temperature.
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.