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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TLDR
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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Synthesis of hybrid CdS-Au colloidal nanostructures.
TL;DR: Analysis of the hybrid nanostructures by high-resolution TEM shows that there is no preferred orientation between the Au nanocrystal and the CdS nanorod, indicating that growth is nonepitaxial.
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Journal ArticleDOI
Large-Area Ordered Quantum-Dot Monolayers via Phase Separation During Spin-Casting†
TL;DR: In this paper, a new method for forming large-area ordered monolayers of colloidal nanocrystal quantum dots (QDs) is proposed. But the method is not suitable for the fabrication of large-scale structures, as the properties of the resulting films can be controlled in a precise and repeatable manner.
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Method of detecting an analyte in a sample using semiconductor nanocrystals as a detectable label
Marcel P. Bruchez,R. Hugh Daniels,Stephen Empedocles,Vince E. Phillips,Edith Y. Wong,Donald A. Zehnder +5 more
TL;DR: The use of semiconductor nanocrystals as detectable labels in various chemical and biological applications is disclosed in this paper, where the methods find use for detecting a single analyte, as well as multiple analytes by using more than one SNC as a detectable label, each of which emits at a distinct wavelength.
Journal ArticleDOI
Chirality and chiroptical effects in inorganic nanocrystal systems with plasmon and exciton resonances
TL;DR: The accumulated experimental data and theory on various CD induction mechanisms provide an extended set of tools to properly analyze and understand the electromagnetic influence of chiral molecules on inorganic particles and obtain new general insights into the interaction of capping molecules with inorganic NCs.
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.