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One-Step Synthesis of Monodisperse In-Doped ZnO Nanocrystals

T1 - Tunable synthesis and multifunctionalities of Fe3O 4-ZnO hybrid core-shell nanocrystals

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Chemical synthesis method of inorganic nanocrystals …

Biography:
Cecile Reynaud has her expertise in the synthesis and chemical physics of nanomaterials. Her work has mainly dealt with silicon nanocrystals and aligned carbon nanotubes. She was for 15 years at the head of the Laboratory of Nanometric Assemblies (LEDNA) in the fundamental research division of Saclay CEA center. The LEDNA group follows the "bottom-up" approach of nanosciences. It develops its own synthesis methods and obtains nanostructured materials with well-controlled characteristics. The applications are relevant for energy, health, environmental issues and the development of composite materials. The group also develop the up-scaling of its processes to allow their industrial transfer.

SáSynthesis, Characterization and Application to Catalysis of ZnO Nanocrystals, 2015, 14, 735–745.

To fill this gap, we report on the synthesis of alkylzinc phosphinates and their use as efficient precursors of phosphinate-coated ZnO nanocrystals in the quantum size regime.

found that in the synthesis of ZnO nanocrystals, ..

Microwave-Assisted Hydrothermal Synthesis of Co Doped ZnO Nanocrystals

Biography:
Assunta Marrocchi is currently Associate Professor at the Department of Chemistry, Biology and Biotechnology of the University of Perugia. She earned a PhD in Chemical Sciences at the same Institution. In 2008 she conducted research at Northwestern University, Evanston, IL (USA), as visiting scientist. Her research expertise and interests encompass the fields of 1) organic functional materials, with a special emphasis on the sustainable synthesis of photoactive organics for solar cells; 2) biomass sustainable conversion to high added value chemicals.

AB - We report the tunable synthesis and multifunctionalities of Fe 3O4-ZnO hybrid core-shell nanocrystals as prepared through controlled sequential nanoemulsion processes. The characterization shows the orderly variations of the structural, magnetic, photoluminescent and absorption properties of the nanocrystals versus the nanoshell thickness. The nanocrystals reveal structural features unique to the core-shell design and exhibit well-defined superparamagnetic behavior at room temperature. In opposite to the decreasing magnetization, both bandgap and induced surface emissions depend strongly on the increasing nanoshell thickness. Moreover, the FTIR analysis provides the fingerprints of the polymer surfactant, ZnO and Fe 3O4 in the same nano-entity and the core-shell nanocrystals could be directly dispersed in both aqueous and organic media for application readiness. Aptly tunable in nanostructures and thus optimized properties, this kind of monosized, high quality, and multifunctional core-shell nanocrystals could be of interest for fundamental studies and potential applications.

ZnO nanocrystals can be synthesized by a variety of methods.

Influence of Nucleation Rate on the Yield of ZnO Nanocrystals Prepared by Chemical Vapor Synthesis

N2 - Wurtzite ZnO nanocrystals capped with trioctylphosphine oxide or alkylamines are synthesized and characterized. These ZnO nanocrystals can be made n-type either by electron transfer doping from reducing species in solution or by above band gap photoexcitation with a UV lamp. The n-type nanocrystals exhibit a strong intraband infrared absorption, an extensive bleach of the interband band-edge absorption, and a complete quenching of the photoluminescence.

ZnO nanocrystalline networks (NCNWs) consisting of percolatingnanocrystals with irregular shape and size were synthesized using Alseed layers in a hydrothermal process.

Colloidal chemical synthesis and formation kinetics of ..
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  • Starch Assisted So No Chemical Synthesis of Flower-like Zno

    Jan 30, 2008 · Synthesis and alignment of Zn and ZnO nanoparticles by laser-assisted chemical ..

  • Zinc Oxide—From Synthesis to Application: A Review - MDPI

    (95k) Low Temperature Synthesis and Characterization of Highly Monodisperse Tm-Doped Zno Nanocrystals

  • Journal of Nanoscience and Nanotechnology

    Structural, optical and fluorescence properties of wet chemically synthesized ZnO:Pd2+nanocrystals SpringerLink

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Hua Zhang - Nanyang Technological University, Singapore

We report an efficient synthesis of copper indium sulfide nanocrystals with strong photoluminescence in the visible to near-infrared. This method can produce gram quantities of material with a chemical yield in excess of 90% with minimal solvent waste. The overgrowth of as-prepared nanocrystals with a few monolayers of CdS or ZnS increases the photoluminescence quantum efficiency to > 80%. On the basis of time-resolved spectroscopic studies of core/shell particles, we conclude that the emission is due to an optical transition that couples a quantized electron state to a localized hole state, which is most likely associated with an internal defect.

Nanocomposites: synthesis, structure, properties and …

AB - Wurtzite ZnO nanocrystals capped with trioctylphosphine oxide or alkylamines are synthesized and characterized. These ZnO nanocrystals can be made n-type either by electron transfer doping from reducing species in solution or by above band gap photoexcitation with a UV lamp. The n-type nanocrystals exhibit a strong intraband infrared absorption, an extensive bleach of the interband band-edge absorption, and a complete quenching of the photoluminescence.

See Opportunities posted on May 6, 2015

N2 - Plasmonic metal oxide nanocrystals bridge the optoelectronic gap between semiconductors and metals. In this study, we report a facile, non-injection synthesis of ZnO nanocrystals doped with Al, Ga, or In. The reaction readily permits dopant/zinc atomic ratios of over 15 , is amenable to high precursor concentrations (0.2 M and greater), and provides high reaction yields (>90 ). The resulting colloidal dispersions exhibit high transparency in the visible spectrum and a wavelength-tunable infrared absorption, which arises from a dopant-induced surface plasmon resonance. Through a detailed investigation of reaction parameters, the reaction mechanism is fully characterized and correlated to the optical properties of the synthesized nanocrystals. The distinctive optical features of these doped nanocrystals are shown to be readily harnessed within thin films that are suitable for optoelectronic applications.

World Nano and materials Science 2018 | April 16-18, …

AB - Plasmonic metal oxide nanocrystals bridge the optoelectronic gap between semiconductors and metals. In this study, we report a facile, non-injection synthesis of ZnO nanocrystals doped with Al, Ga, or In. The reaction readily permits dopant/zinc atomic ratios of over 15 , is amenable to high precursor concentrations (0.2 M and greater), and provides high reaction yields (>90 ). The resulting colloidal dispersions exhibit high transparency in the visible spectrum and a wavelength-tunable infrared absorption, which arises from a dopant-induced surface plasmon resonance. Through a detailed investigation of reaction parameters, the reaction mechanism is fully characterized and correlated to the optical properties of the synthesized nanocrystals. The distinctive optical features of these doped nanocrystals are shown to be readily harnessed within thin films that are suitable for optoelectronic applications.

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