240 results about "Metal clusters" patented technology

This invention is directed to making chemical derivatives of carbon nanotubes and to uses for the derivatized nanotubes, including making arrays as a basis for synthesis of carbon fibers. In one embodiment, this invention also provides a method for preparing single wall carbon nanotubes having substituents attached to the side wall of the nanotube by reacting single wall carbon nanotubes with fluorine gas and recovering fluorine derivatized carbon nanotubes, then reacting fluorine derivatized carbon nanotubes with a nucleophile. Some of the fluorine substituents are replaced by nucleophilic substitution. If desired, the remaining fluorine can be completely or partially eliminated to produce single wall carbon nanotubes having substituents attached to the side wall of the nanotube. The substituents will, of course, be dependent on the nucleophile, and preferred nucleophiles include alkyl lithium species such as methyl lithium. Alternatively, fluorine may be fully or partially removed from fluorine derivatized carbon nanotubes by reacting the fluorine derivatized carbon nanotubes with various amounts of hydrazine, substituted hydrazine or alkyl amine. The present invention also provides seed materials for growth of single wall carbon nanotubes comprising a plurality of single wall carbon nanotubes or short tubular molecules having a catalyst precursor moiety covalently bound or physisorbed on the outer surface of the sidewall to provide the optimum metal cluster size under conditions that result in migration of the metal moiety to the tube end.

The present invention relates to a fabrication method of nitride-based semiconductors and a nitride-based semiconductor fabricated thereby. In the fabrication method of the invention, a self-organizing metal layer is formed on a sapphire substrate. The sapphire substrate having the self-organizing metal layer is heated so that self-organizing metal coalesces into nanoscale clusters to irregularly expose an upper surface of the sapphire substrate. Exposed portions of the sapphire substrate is plasma etched using the self-organized metal clusters as a mask to form a nanoscale uneven structure on the sapphire substrate. A resultant structure is wet etched to remove the self-organized metal clusters. The nanoscale uneven structure formed on the sapphire substrate decreases the stress and resultant dislocation between the sapphire substrate and a nitride-based semiconductor layer as well as increases the quantum efficiency between the same.

The present invention provides a metal-organic framework (“MOF”) comprising a plurality of metal clusters and a plurality of multidentate linking ligands. Each metal of the plurality of metal clusters comprises one or more metal ions. Each ligand of the plurality of multidentate linking ligands connects adjacent metal clusters. The present invention also provides a method of forming the metal-organic framework. The method of the invention comprises combining a solution comprising one or metal ions with a multidentate linking ligand having a sufficient number of accessible sites for atomic or molecular adsorption that the surface area of the resulting metal-organic framework is greater than 2,900 m²/g.

A filter such as a cigarette filter having a metal reagent which selectively binds with a gaseous component of a gas stream such as tobacco smoke. The metal reagent comprises nanometer or micrometer size clusters of a transition metal or alloy containing a transition metal. The transition metal can be incorporated in an intermetallic compound such as titanium aluminide or iron aluminide. The metal clusters can be incorporated in or on a support material such as silica gel, porous carbon or a zeolite. The metal reagent can remove the gaseous component by selectively binding to unsaturated hydrocarbons such as 1,3-butadiene. The binding can occur by insertion of a metal atom of the metal reagent into a C—H bond or a C—C bond of the gaseous component.

The present invention relates to polynary metal cluster as water purifying material and its preparation process and use. The water purifying material is prepared with porous material in 50-99 wt%, and two or more metals of Ag, Cu, Zn and RE in 1-50 wt%. The preparation process includes: selecting metal source; adding the metal source directly or after being compounded into water solution into the porous material to form combined body; and introducing reductant after roasting. Water to be purified is made to flow through the water purifying material or mixed with the water purifying material for purifying. The water purifying material has great specific surface area, high activity and high homogeneity, and may be used to eliminate water soluble heavy metal ion, micro organic pollutant, residual chlorine and sterilizing side product in high effect.

The present invention relates to various methods of sensitizing and modifying nanosensor platforms. In one embodiment, the present invention provides a method of increasing sensitivity by inhibiting oxidation of one or more 1,4-hydroquinone (HQ) molecules, functionalizing the nanosensor by using one or more diazonium molecules, creating one or more oxidized carbon groups on the nanosensor, and/or depositing one or more metal clusters on the nanosensor.

Metal-organic framework-based molecular sieves comprising pores with a temperature-adjustable pore opening. The temperature-adjustable pore size molecular sieves comprise a plurality of metal clusters bound with a plurality of amphiphilic ligands, each ligand comprising a functionalized hydrophobic moiety and a functionalized hydrophilic moiety, and wherein the metal clusters and amphiphilic ligand hydrophilic moieties form a metal cluster layer, the metal cluster layer forming at least one hydrophilic pore. On each side of the metal cluster layer, a plurality of associated amphiphilic ligand hydrophobic moieties cooperate with the metal cluster layer to form a tri-layer and a plurality of tri-layers are held in proximity with each other to form at least one hydrophobic chamber. The hydrophobic moieties form temperature-adjustable pore size hydrophobic pores. When adjusted to a pre-selected temperature the temperature-adjustable pore openings allow for the passage of molecules having a size less than the size of the pre-selected temperature-adjustable pore opening.

A GaN-based light-emitting device and the fabricating method for the same are described. The light-emitting device is a light-emitting body with a light extraction layer thereon. The light-emitting body has some GaN-based layers and is capable of emitting a light when energy is applied. The light extraction layer is a double layered structure having a current spreading layer and a micro-structure layer, or a single layered structure without the current spreading layer. The micro-structure layer is a TiN layer with a nano-net structure obtained by nitridation of a Ti layer or a Pt layer with metal clusters thereon obtained by annealing of a Pt layer.

The invention provides an electrode material surface coating method and application thereof. The method includes steps: (1) enabling in-situ growth of a metal organic skeleton on the surface of an electrode material; (2) subjecting the metal organic skeleton coated electrode material to heat treatment to obtain an oxide coated electrode material. Since the metal organic skeleton material with appropriate morphologic size and target ion metal clusters is designed as a precursor and converted into nanometer oxide after heat treatment, effective coating of the electrode material with the metal oxide and regulation of structure and coating amount of the metal oxide can be realized, more surface coating substances and structures difficult to realize by traditional methods can be introduced, and the electrode material surface coating method is a novel electrode material surface coating means.

Metal-organic frameworks (MOFs) are provided. An exemplary MOF includes a plurality of metal clusters, at least one linking ligand, and at least one dopant. Doped MOFs according to embodiments of the present invention have significantly increased H2 uptake capacity, and some embodiments meet the 2010 DOE H2 storage target of 6 wt % at a temperature ranging from −30 to 80° C. and a pressure less than or equal to 100 bar.

A coordination polymer includes a plurality of metal atoms or metal clusters linked together by a plurality of organic linking ligands. Each linking ligand comprises a residue of a negatively charged polydentate ligand. Characteristically, the plurality of multidentate ligands include a first linking ligand having first hydrocarbon backbone and a second ligand having a second hydrocarbon backbone. The first hydrocarbon backbone is different than the second hydrocarbon backbone.

The invention relates to a method and application for preparing water-soluble luminescent metal clusters of platinum, gold, silver and copper. This method uses the biomolecule histidine as a stabilizer and ascorbic acid as a reducing agent to prepare four metal clusters with photoluminescent properties of platinum, gold, silver and copper. This method is non-toxic and harmless, and the conditions are mild and fast. , the size distribution of the generated metal clusters is uniform, the particle size is 1-2 nm, and it has good luminous efficiency. The luminous efficiencies of metal platinum, gold, silver, and copper clusters prepared by the method of the present invention are 2.93%, 13.1%, 6.97%, and 8.26%, respectively, and have high selective response to aqueous phase iron ions, and the fluorescence intensity will decrease. Significantly decreased with the increase of iron ion concentration. The linear response ranges to iron ion concentration are 0.05-110μmol/L, 5-125μmol/L, 2.5-500μmol/L and 0.5-100μmol/L, respectively. It can be used as a high-sensitivity fluorescent probe for iron ions in the field of biological detection. It has good application prospect in iron ion detection sensor.

An air purification system that comprises a substrate, and at least one layer of photocatalysts. The at least one layer of photocatalysts further comprise a plurality of metal clusters.

The invention belongs to the technical fields of light-industry and chemical materials, and provides a Uio-66 in-situ immobilized carboxyl functionalized ionic liquid composite material as well as preparation and an application thereof. The composite material uses a metal organic skeleton material Uio-66 as a carrier and a carboxyl functionalized ionic liquid as an active component, carboxyl of the carboxyl functionalized ionic liquid and a zirconium metal cluster are subjected to coordination bonding while the Uio-66 is synthesized, the carboxyl functionalized ionic liquid is immobilized in aUio-66 pore cage in situ, and therefore the composite material is prepared. The composite material provided by the invention has the characteristics of high catalytic activity, a quick mass transferspeed, good selectivity, easy recovery and separation, environmental friendliness, and broad industrialized application prospects in addition to good physical stability and chemical stability; the composite material prepared by the method has a very good effect as a catalyst of an esterification reaction and transesterification reaction of various acids and alcohols; and the composite material hasan obvious adsorption effect on heavy metal ions contained in a liquid as an adsorbent.

The invention belongs to the technical field of functional biological nanometer materials, and concretely relates to a polypeptide-modified gold nanocluster and a preparation method thereof. Two polypeptides KRKC and GSH are employed ad stabilizing agents for modification during hydrothermal preparation, a red fluorogold nanocluster with targeting marking effect on cell nucleolus by designing polypeptide sequence for guaranteeing stability of metal clusters, and has the particle size within the scope of 1.5-2.8 nm and the average particle size of 1.9 nm, the gold nanocluster has an obvious absorption peak near 400 nm, when a laser of 400 nm is used to irradiate the gold nanocluster, relatively strong fluorescence emission is generated at the region of 500-750 nm, the emission peak is near 586 nm, and the fluorescent quantum yield of the gold nanocluster is 7%. The method is simple, strong in operability and low in cost, the material is stabilized by the polypeptides, has good biocompatibility, and is low in toxicity, good in stability, long in emission wavelength and beneficial for obtaining relatively good nucleolus imaging effect by employing the polypeptides as the stabilizing agents.