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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Noble metal@metal oxide semiconductor core@shell nano-architectures as a new platform for gas sensor applications
TL;DR: In this article, an overview of the advances in this exciting field of noble metals@metal oxides core-shell NPs has been presented in this feature article, which includes systematic synthesis approaches of noble metal@metal oxide core@shell nanomaterials and their applications in the field of gas sensors, which is based on the literature and our own recent work.
Journal ArticleDOI
Soluble, Chloride-Terminated CdSe Nanocrystals: Ligand Exchange Monitored by 1H and 31P NMR Spectroscopy
TL;DR: Chloride-terminated, tri-n-butylphosphine (Bu3P) bound CdSe nanocrystals were prepared by cleaving carboxylate ligands from CdS nanocrystal (2.5 carboxyclate/nm2) with chlorotrimethylsilane in Bu3P solution as discussed by the authors.
Journal ArticleDOI
Nanomanufacturing: A Perspective
TL;DR: This work considers the factors involved in matching processes with products, examining the characteristics and potential of top-down and bottom-up processes, and their combination, and how a careful assessment of the way in which function can be made to follow form can enable high-volume manufacturing of nanoscale structures with the desired useful, and exciting, properties.
Patent
Synthesis of colloidal nanocrystals
TL;DR: In this paper, a method of synthesizing colloidal nanocrystals is disclosed using metal oxides or metal salts as a precursor, which is combined with a ligand and then heated in combination with a coordinating solvent.
Patent
Post-deposition encapsulation of nanostructures: compositions, devices and systems incorporating same
Jeffery A. Whiteford,Rhett Brewer,Mihai Buretea,Jian Chen,Chu Karen Cruden,Xiangfeng Duan,William P. Freeman,David Heald,Francisco Leon,Chao Liu,Andreas Meisel,Kyu S. Min,J. Wallace Parce,Erik C. Scher +13 more
TL;DR: In this article, the ligands and coated nanostructures of the present invention are particularly useful for close packed nanostructure compositions, which can have improved quantum confinement and/or reduced cross-talk between the two structures.
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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.