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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CdSe/ZnS Core/Shell Quantum Dot Sensitization of Low Index TiO2 Single Crystal Surfaces
TL;DR: It is demonstrated that type-I CdSe/ZnS CS QDs can effectively sensitize single crystal TiO(2) electrodes and continue to operate in a regenerative mode in an aerated iodide electrolyte for more than 20 h.
Journal ArticleDOI
Enhanced Open-Circuit Voltage of PbS Nanocrystal Quantum Dot Solar Cells
Woojun Yoon,Janice E. Boercker,Matthew P. Lumb,Matthew P. Lumb,Diogenes Placencia,Edward E. Foos,Joseph G. Tischler +6 more
TL;DR: There is a tremendous opportunity for improvement of Voc to values greater than 1 V by using smaller QDs in QD solar cells, compared with the theoretical upper-limit obtained from one diode modeling of the cells with different Eg.
Journal ArticleDOI
Polyvalent Display and Packing of Peptides and Proteins on Semiconductor Quantum Dots: Predicted Versus Experimental Results
Duane E. Prasuhn,Jeffrey R. Deschamps,Kimihiro Susumu,Michael H. Stewart,Kelly Boeneman,Juan B. Blanco-Canosa,Philip E. Dawson,Igor L. Medintz +7 more
TL;DR: It is found that for the larger protein molecules steric hindrance is the major packing constraint, and for the smaller peptides, the number of available QD binding sites is the principal determinant.
Journal ArticleDOI
ZnO nanorods/Au hybrid nanocomposites for glucose biosensor.
TL;DR: It is estimated that this ZnO/Au is an attractive material for the fabrication of efficient amperometric biosensors because of its good electron transferring and biocompatibility.
Journal ArticleDOI
Highly luminescent InP/GaP/ZnS QDs emitting in the entire color range via a heating up process.
TL;DR: This work introduces a simple synthetic method for InP/GaP/ZnS core/shell/shell QDs via a heating process and utilized t-DDT as a new sulfur source, which allowed for the formation of a thicker shell.
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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.