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
Reads0
Chats0
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
Citations
More filters
Journal ArticleDOI
Photoluminescence depending on the ZnS shell thickness of CdS/ZnS core-shell semiconductor nanoparticles
Alexandre Loukanov,Ceco D. Dushkin,K. I. Papazova,Andrey V. Kirov,Miroslav Abrashev,Eiki Adachi +5 more
TL;DR: In this article, a core/shell type semiconductor nanoparticle of CdS/ZnS emits visible light under ultra-violet illumination, whose emission wavelength depends on the particle diameter and ZnS shell thickness.
Journal ArticleDOI
Hydrogen-Bonded Organic Semiconductor Micro- And Nanocrystals: From Colloidal Syntheses to (Opto-)Electronic Devices
Mykhailo Sytnyk,Eric Daniel Głowacki,Sergii Yakunin,Gundula Voss,Wolfgang Schöfberger,Dominik Kriegner,Julian Stangl,Rinaldo Trotta,Claudia Gollner,Sajjad Tollabimazraehno,Giuseppe Romanazzi,Zeynep Bozkurt,Marek Havlicek,Niyazi Serdar Sariciftci,Wolfgang Heiss +14 more
TL;DR: The semiconducting nanocrystals described here offer a cheap, nontoxic, and environmentally friendly alternative to inorganic nanocry crystals as well as a new paradigm for obtaining organic semiconductor materials from commercial colorants.
Journal ArticleDOI
Quantum Dot as a Drug Tracer In Vivo
TL;DR: This work conjugated QDs with captopril, anti-hypertensive medicine, by an exchange reaction while retaining the medicinal properties and succeeded in analyzing the dynamics and kinetics of small molecules using fluorescence of QDs.
PatentDOI
Photoligation of an amphiphilic polymer with mixed coordination provides compact and reactive quantum dots
TL;DR: In this article, a ligand design relies on the introduction of controllable numbers of lipoic acid and histamine anchors, along with hydrophilic moieties and reactive functionalities, onto a poly(isobutylene-alt-maleic anhydride) chain via a one-step nucleophilic addition reaction.
Journal ArticleDOI
Twinned Zn2TiO4 Spinel Nanowires Using ZnO Nanowires as a Template
TL;DR: In this article, the as-grown ZnOnanowires shown in Figure 1a are randomly aligned, of about 40-60 nm in diameter, and 10 lm in length.
References
More filters
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.