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Showing 1 to 13 of 13 for “"Trioctylphosphine"”.
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Colloidal Semiconductor Nanocrystals: A Study of the Syntheses of and Capping Structures for CdSe
… CdO, a high boiling point ligand, and a Se-trioctylphosphine conjugate. This investigation explores the means to produce quantum dots by this method and to activate the surface or modify the reaction chemistry with such molecules as trioctylphosphine oxide, stearic acid, dodecylamine, phenyl …
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Luminescent Semiconductor Quantum Dots (QDs) and Their Nanoassemblies as Bioprobes
… reverse micelles, aqueous solution, and trioctylphosphine oxide/trioctylphosphine (TOPO/TOP). Transmission electron microscope (TEM), X-ray diffraction (XRD), UV-VIS, fluorescence spectroscopy and microscopy were used to characterize the QDs and their nanoassemblies. CdS QDs synthesized …
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Synthetic Strategies and Design of Highly Luminescent Cholinomimetic Quantum Dots
… core in a colloidal organic matrix with trioctylphosphine, trioctylphosphine oxide and hexadecylamine as the coordinating ligands and passivating agents to control growth. The QDs were ~6.2 nm in diameter and exhibited strong and narrow fluorescence intensity and broad UV-absorption …
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Synthesis, Purification and Application of Few-Walled Carbon Nanotubes and Inorganic Nanowires
… phosphide nanorods and nanowires. The mixture of trioctylphosphine oxide (TOPO) and trioctylphosphine (TOP) which are commonly used as the solvents for semiconductor nanocrystal synthesis is not entirely inert. TOP serves as phosphor source and reacts with Fe precursors to generate iron phosphide …
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Organometallic Synthesis Kinetics of CdSe Quantum Dots
… kinetics in stearic acid, dodecylamine, and in trioctylphosphine oxide. The nucleation rate increased with Se concentration, while the growth rate followed the Cd concentration. Emission peak widths, emission redshift rates, nanocrystal growth rates, and reactant concentrations all decreased to …
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CDSE Quantum Dots and Luminescent/Magnetic Particles for Biological Applications
… to water by exchanging the capping group (Trioctylphosphine Oxide—TOPO) with mercaptoacetic acid. To develop a separation and detection tool for cells, we combined γ-Fe2O3 magnetic particles with CdSe/ZnS QDs in core-shell composite. The composite nanoparticles showed strong fluorescence …
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Ionic liquids for main group catalysis
… SbCl3, SnCl4, SnCl2, ZnCl2 or TiCl4 with either trioctylphosphine (P888) or trioctylphosphine oxide (P888O), through study of their speciation and quantification of their acidity using Gutmann acceptor numbers (Chapter 2).<br/><br/>The second drawback of chloroaluminate ionic liquids (Lewis …
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Synthesis and characterization of cobalt nanocrystals
… with mixed fcc-hcp structure, where as trioctylphosphine oxide leads to a newly discovered structure of [epsilon]-cobalt. The final size of the crystals is controlled by the precursor-to-ligand ratio, and low polydispersity is achieved by the separation of nucleation and growth stages. …
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Semiconductor nanocrystal colloids : manganese doped cadmium selenide, (core)shell composites for biological labeling, and highly fluorescent cadmium telluride
… precursors in the coordinating solvent trioctylphosphine oxide (TOPO). The important developments that have contributed to this method are discussed. Manganese doped CdSe nanocrystals are synthesized using a manganese and selenium containing organometallic compound. Chemical etching and …
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Synthesis and evaluation of novel ligands for quantum dot stabilisation and polymerisation studies
… oxides and sulfides, based on the structure of trioctylphosphine oxide, synthesised for the purpose of surface modification of quantum dots. The ability of the ligands to modify the surface chemistry via displacement of the original hexadecylamine capping layer of quantum dots was evaluated. …
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Connecting Thermodynamics and Kinetics of Ligand Controlled Colloidal Pd Nanoparticle Synthesis
… solvents as ligands together with the trioctylphosphine ligand. In-situ small angle X-ray scattering was applied to characterize the time evolutions of size, size distribution, and particle concentration using synthesis reactor connected to a capillary flow cell. From the real-time …
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Synthesis And Characterization Of Size Controlled Transitionmetal Phosphide Nanoparticles And Their Hydrodesulfurization Catalytic Activity
… reaction of palladium (II) acetylacetonate with trioctylphosphine at temperatures up to 300 ºC. Direct crystallization of Pd<sup>5</sup>P<sup>2</sup> in solution by increasing temperatures to 360 ºC leads to sintering, but particle size can be maintained during the transformation by encapsulation …
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Doping of group IV semiconductor nanowires
As Moore’s Law predicted in the 1960s, advancements in technology have led to an exponential increase in the numbers of transistors required per square inch of integrated circuits, leading to an ever pressing need for smaller transistors. In turn, there is a need for novel transistor architectures …