Journal ArticleDOI
Relations between the Photoluminescence Efficiency of CdTe Nanocrystals and Their Surface Properties Revealed by Synchrotron XPS
Holger Borchert,Dmitri V. Talapin,Nikolai Gaponik,C. McGinley,S. Adam,Arun Lobo,and Thomas Möller,Horst Weller +7 more
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TLDR
The surface of colloidally prepared CdTe nanocrystals capped with thioglycolic acid has been studied by photoelectron spectroscopy with tunable synchrotron radiation excitation as discussed by the authors.Abstract:
The surface of colloidally prepared CdTe nanocrystals capped with thioglycolic acid has been studied by photoelectron spectroscopy with tunable synchrotron radiation excitation. Colloidally prepare...read more
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Aqueous synthesis of thiol-capped CdTe nanocrystals : State-of-the-art
Andrey L. Rogach,Thomas Franzl,Thomas A. Klar,Jochen Feldmann,Nikolai Gaponik,Vladimir Lesnyak,Alexey Shavel,Alexander Eychmüller,Yury P. Rakovich,John F. Donegan +9 more
TL;DR: In this article, the state-of-the-art synthesis and improved luminescence properties of thiol-capped CdTe nanocrystals (NCs) synthesized in water were reported.
Journal ArticleDOI
Determination of the Fluorescence Quantum Yield of Quantum Dots: Suitable Procedures and Achievable Uncertainties
Markus Grabolle,Monika Spieles,Vladimir Lesnyak,Nikolai Gaponik,Alexander Eychmüller,Ute Resch-Genger +5 more
TL;DR: In this article, the authors investigated achievable uncertainties for the determination of fluorescence quantum yields of these chromophores and illustrate common pitfalls exemplarily for differently sized water-soluble CdTe QDs.
Journal ArticleDOI
Enhancement Effect of Illumination on the Photoluminescence of Water-Soluble CdTe Nanocrystals: Toward Highly Fluorescent CdTe/CdS Core−Shell Structure
TL;DR: In this article, a strong photoluminescence enhancement effect of illumination on CdTe nanocrystals stabilized by thioglycolic acid (TGA) was observed.
Journal ArticleDOI
Electrochemistry and electrogenerated chemiluminescence of CdTe nanoparticles
TL;DR: Differential pulse voltammetry (DPV) of TOPO-capped CdTe nanoparticles (NPs) in dichloromethane and a mixture of benzene and acetonitrile showed two anodic and one cathodic peaks of the NPs themselves and an additional anodic peak resulting from the oxidation of reduced NPs.
Journal ArticleDOI
Aqueous Based Semiconductor Nanocrystals
Lihong Jing,Stephen V. Kershaw,Yilin Li,Xiaodan Huang,Yingying Li,Andrey L. Rogach,Mingyuan Gao +6 more
TL;DR: This review summarizes traditional and recent nonconventional, bioinspired, methods for the aqueous synthesis of colloidal semiconductor quantum dots (QDs) and describes the considerable progress in some selected QD applications such as in bioimaging and theranostics.
References
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Journal ArticleDOI
Quantitative electron spectroscopy of surfaces: A standard data base for electron inelastic mean free paths in solids
Martin P. Seah,W. A. Dench +1 more
TL;DR: In this paper, a compilation of all published measurements of electron inelastic mean free path lengths in solids for energies in the range 0-10 000 eV above the Fermi level is presented.
Journal ArticleDOI
Thiol-capping of cdte nanocrystals: an alternative to organometallic synthetic routes
Nikolai Gaponik,Dmitri V. Talapin,Andrey L. Rogach,Kathrin Hoppe,Elena V. Shevchenko,Andreas Kornowski,and Alexander Eychmüller,Horst Weller +7 more
TL;DR: In this article, photostable thiol-capped CdTe nanocrystals were synthesized using post-preparative size-selective precipitation and selective photochemical etching.
Journal ArticleDOI
Total valence-band densities of states of III-V and II-VI compounds from x-ray photoemission spectroscopy
TL;DR: In this paper, a comprehensive survey of the total valence-band x-ray-photo-emission spectra of 14 semiconductors is reported, including cubic GaP, GaAs, GaSb, InP, InAs, InSb InS, ZnS and CdSe are compared with UPS and theoretical band-structure results.
Journal ArticleDOI
Dynamic Distribution of Growth Rates within the Ensembles of Colloidal II−VI and III−V Semiconductor Nanocrystals as a Factor Governing Their Photoluminescence Efficiency
Dmitri V. Talapin,Andrey L. Rogach,Elena V. Shevchenko,Andreas Kornowski,Markus Haase,Horst Weller +5 more
TL;DR: The distribution of properties within ensembles of colloidally grown II-VI and III-V semiconductor nanocrystals was studied and a drastic difference in the photoluminescence efficiencies of size-selected fractions was observed, indicating a general character of the phenomenon observed.
Journal ArticleDOI
Synthesis and characterization of thiol-stabilized CdTe nanocrystals
Andrey L. Rogach,L. Katsikas,Andreas Kornowski,Dangsheng Su,Alexander Eychmüller,Horst Weller +5 more
TL;DR: In this article, a series of oxidize-stable CdTe nanoclusters with narrow size distributions and extremely small particle sizes ranging from 1.3 to 2.4 nm has been prepared in aqueous solution using 2-mercaptoethanol and 1-thioglycerol as stabilizers.
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