Journal ArticleDOI
Single-Precursor, One-Pot Versatile Synthesis under near Ambient Conditions of Tunable, Single and Dual Band Fluorescing Metal Sulfide Nanoparticles
Narayan Pradhan,Shlomo Efrima +1 more
TLDR
The precise control over the particle size enables tuning the absorption and emission spectra of the particles, and the relative intensity of the narrow and broad emission associated with deep surface traps is controlled.Abstract:
We present a simple and versatile method for the synthesis of high-quality size-controlled metal sulfide nanoparticles. A single compound (metal xanthate) is the precursor. A Lewis-base solvent is used to achieve a low reaction temperature of 50-150 degrees C, usually in air. Demonstrated with CdS, the precise control over the particle size (by regulating the temperature or the concentration) enables tuning the absorption and emission spectra of the particles. We also can control the relative intensity of the narrow (30-35 nm wide) excitonic emission (tunable in the range 430-480 nm with approximately 2% fluorescence quantum efficiency) and the broad emission associated with deep surface traps (in the range 550-700 nm). Using the same precursor CdS/ZnS core/shell particles are produced with a high PL yield ( approximately 14%).read more
Citations
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Journal ArticleDOI
Synthesis of monodisperse spherical nanocrystals.
TL;DR: Mechanistic studies have shown that monodisperse nanocrystals are produced when the burst of nucleation that enables separation of the nucleation and growth processes is combined with the subsequent diffusion-controlled growth process through which the crystal size is determined.
Journal ArticleDOI
The role of interparticle and external forces in nanoparticle assembly
TL;DR: Why and how a combination of self- and directed-assembly processes, involving interparticle and externally applied forces, can be applied to produce desired nanostructured materials are discussed.
Journal ArticleDOI
Generalized and facile synthesis of semiconducting metal sulfide nanocrystals.
Jin Joo,Hyon Bin Na,Taekyung Yu,Jung Ho Yu,Young-Woon Kim,Fanxin Wu,Jin Z. Zhang,Taeghwan Hyeon +7 more
TL;DR: The synthesis of semiconductor nanocrystals of PbS, ZnS, CdS, and MnS through a facile and inexpensive synthetic process and all of the synthesized nanocry crystals were highly crystalline.
Journal ArticleDOI
Synthesis of CdSe and CdTe nanocrystals without precursor injection
TL;DR: How to design a noninjection synthesis for making high-quality CdSe and CdTe nanocrystals without nucleation initiators is reported, which results in products with poor monodispersity.
Journal ArticleDOI
One-Pot Synthesis of High-Quality Zinc-Blende CdS Nanocrystals
Y. Charles Cao,Jianhui Wang +1 more
TL;DR: It is demonstrated that the nanocrystal nucleation and growth stages can be automatically separated in a homogeneous system with the presence of nucleation initiators.
References
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Journal ArticleDOI
Semiconductor Nanocrystals as Fluorescent Biological Labels
TL;DR: Semiconductor nanocrystals prepared for use as fluorescent probes in biological staining and diagnostics have a narrow, tunable, symmetric emission spectrum and are photochemically stable.
Journal ArticleDOI
Quantum Dot Bioconjugates for Ultrasensitive Nonisotopic Detection
Warren C. W. Chan,Shuming Nie +1 more
TL;DR: Highly luminescent semiconductor quantum dots (zinc sulfide-capped cadmium selenide) have been covalently coupled to biomolecules for use in ultrasensitive biological detection and these nanometer-sized conjugates are water-soluble and biocompatible.
Journal ArticleDOI
Nucleation and Growth of CdSe on ZnS Quantum Crystallite Seeds and Vice Versa, in Inverse Micelle Media
A. R. Kortan,Robert Hull,Robert L. Opila,Moungi G. Bawendi,Michael L. Steigerwald,P. J. Carroll,Louis E. Brus +6 more
TL;DR: In this article, a simple theoretical model for the LUMO and HOMO of layered crystallites is presented, showing that a small (< 15-angstrom) diameter interior foreign seed causes only small shifts of the lowest excited state, to either higher or lower energies.
Journal ArticleDOI
Optical emission from a charge-tunable quantum ring
R. J. Warburton,R. J. Warburton,C. Schäflein,D. Haft,F. Bickel,Axel Lorke,Khaled Karrai,Jorge M. Garcia,Winston V. Schoenfeld,Pierre Petroff +9 more
TL;DR: It is found that the emission energy changes abruptly whenever an electron is added to the artificial atom, and that the sizes of the jumps reveal a shell structure.
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