Journal ArticleDOI
On the Nanoparticle to Molecular Size Transition: Fluorescence Quenching Studies
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TLDR
In this paper, butylamine is added to colloidal solutions of semiconductor nanoparticles in this size range, and the decrease in fluorescence intensity does not follow standard molecular models of collisional fluorescence quenching.Abstract:
Semiconductor nanoparticles, NPs, exhibit fluorescence properties that are closely related to the nature of their surface. CdSe NPs that range in size from 2 to 15 nm in diameter fluoresce with both near-band-edge emission and deep-trap emission, depending on the quality of the surface. When butylamine is added to colloidal solutions of NPs in this size range, the amine is thought to bind to the NP surface and eliminate radiant recombination pathways that lead to luminescence. Since the amine binds to the NP surface, the decrease in fluorescence intensity does not follow standard molecular models of collisional fluorescence quenching. NPs that are smaller than ∼2 nm are composed entirely of a discontinuous arrangement of atoms that are all in constant chemical contact with capping material, solvent, and contaminants. When butylamine is added to solutions of these smaller NPs, the fluorescence quenching follows more standard collisional quenching models. Thus, by monitoring the interaction between NPs and ...read more
Citations
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Self-assembled monolayers of thiolates on metals as a form of nanotechnology.
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Quantum Dot Solar Cells. Semiconductor Nanocrystals as Light Harvesters
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Meeting the Clean Energy Demand: Nanostructure Architectures for Solar Energy Conversion
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Photoinduced electron transfers with carbon dots
Xin Wang,Li Cao,Fushen Lu,Mohammed J. Meziani,Heting Li,Gang Qi,Bing Zhou,Barbara A. Harruff,Fabien Kermarrec,Ya-Ping Sun +9 more
TL;DR: The photoluminescence in carbon dots could be quenched efficiently by electron acceptor or donor molecules in solution, thus offering new opportunities for their potential uses in light energy conversion and related applications.
References
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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.
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A simple model for the ionization potential, electron affinity, and aqueous redox potentials of small semiconductor crystallites
TL;DR: In this article, the photochemical redox potential of one carrier, as a function of the size of the crystal, has been studied in the case of a small number of electrons.
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Photochemistry of colloidal semiconductors. 20. Surface modification and stability of strong luminescing CdS particles
TL;DR: The preparation of CdS sols with a mean diameter between 40 and 60 A and a relatively narrow size distribution is described in this paper, where the colloids could be separated as solids, which in turn could be redissolved to give solutions of some 10/sup -2/M.
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Photophysics and photochemistry of oxygen sensors based on luminescent transition-metal complexes
TL;DR: A detailed study of the photophysics and photochemistry of polymer-immobilized luminescent transition-metal complex is presented in this paper, where the authors focus on understanding the underlying origin of the nonlinear Stern-Volmer quenching response.
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Size Dependence of a First Order Solid-Solid Phase Transition: The Wurtzite to Rock Salt Transformation in CdSe Nanocrystals
TL;DR: High-pressure x-ray diffraction and optical absorption are used to study the wurtzite to rock salt structural transformation in CdSe nanocrystals, showing that both the thermodynamics and kinetics of this transformation are altered in finite size, as compared to bulk Cd Se.