100 results about "Silicon nanotube" patented technology

The invention discloses a method for preparing a one-dimensional silicon nanostructure in a anodic aluminum oxide mold, which comprises the following steps: growing the one-dimensional silicon nanostructure in low-temperature by the method of plasma chemical depositing with the spacing limited function of porous aluminium oxide, including the silicon nanowire and silicon nanotube, preparing a porous aluminum oxide mold with honeycomb structure by anodic oxidation process, wherein openings arrange ordered, apertures are coherent and vertical the surfaces of the mold, imbedding the mold into a plasma enhanced chemical depositing reaction chamber, growing the silicon nanowire or silicon nanotube at a temperature of 300 Deg. C by controlling the gas flow with the perhydrous diluting silane as the growth air supply.

The invention discloses an oxygen evolution Fe-doped cobalt diselenide@N-CT compound catalyst and a preparation method and application thereof. The compound catalyst comprises Fe-doped CoSe2 nano particles coated by an N-doped carbon nanotube. The preparation method includes: evaporating and drying the solution of cobalt acetate, iron nitrate and urea, and performing high-temperature treatment to obtain the Fe-doped CoSe2 nano particles coated by the N-doped carbon nanotube; mixing the Fe-doped CoSe2 nano particles coated by the N-doped carbon nanotube with Se powder to obtain a mixture, and performing selenylation on the mixture under protective atmosphere to obtain the compound catalyst. The preparation method has the advantages that the method is simple, low in cost and beneficial to industrial production; the prepared Fe-doped CoSe2@N-CT (recorded as FCS@N-CT) compound catalyst is applicable to electrocatalytic water decomposition, and the compound catalyst is good in comprehensive performance as compared with a commercial RuO2 catalyst and is promising in application prospect.

The invention provides a phosphorus-doped graphene quantum dot and an electrochemistry preparing method thereof. According to the preparing method, phosphorus-contained macromolecular organic compounds soluble in water are selected to serve as electrolytes, through controlled potential electrolyzing, phosphorus oxygen bonds are broken, phosphorus atoms are separated from the macromolecular organic compounds to enter the interior of the graphene quantum dot, carbon phosphorus bonds and the phosphorus oxygen bonds are formed, doping is completed, and the phosphorus-doped graphene quantum dot with the higher doping concentration content is prepared; the quantum dot has the good cleaning-up effect on hydroxyl radicals, and through ESR energy spectrum test, the clearing-up rate of the hydroxyl radicals can reach 78.49%; the method is easy and convenient in the operation process, the whole preparing process is conveniently planed as a whole, strong oxidizing acid or strong reducing agents are not used, and certain commercial feasibility is achieved; and graphene precursor which is rich in reserving and friendly to environment is adopted to replace expensive materials of graphite oxide, carbon nano-tubes and the like, and the method is hopefully and widely applied in the biomedical field.

The invention relates to a super-hydrophobic coating having automatical cleaning performance, which is used for protecting the outdoor optical devices. According to the invention, PDMS is taken as a silicon source, multi-walled carbon nanotube is taken as a template, a silicon nanotube coating is constructed on the surface of the glass, then PDMS solidified through chemical vapor deposition performs hydrophobization treatment on the coating, and the transparent super-hydrophobic coating is finally obtained. The super-hydrophobic coating has the advantages of low cost of the raw materials, easy purchase of the raw materials, no involved fluorine-containing pollutant. The super-hydrophobic coating has good transmittance, in a visible light scope, the average light transmittance is greater than 83%. surface water contact angle is greater than 165 DEG, the roll angle is less than 3 DEG, the drops are easily rolled on the surface, the dust on the surface can be taken away, so that the super-hydrophobic coating has good automatical cleaning function. The super-hydrophobic coating can be used for solar cell panel, automobile wind screen glass, contact lens, transparent electrode, camera lens, and building exterior wall.

The invention relates to a method for preparing a loaded transitional metal phosphide catalyst. Red phosphorus is taken as a phosphorus source, chlorides, nitrates and acetates of one or more of metallic elements in a VIB family and/or a VIII family are taken as metal precursors, and wave-absorbing materials such as activated carbon, carbon nanotubes, carbon fibers, carbon molecular sieves, mesoporous carbon, silicon carbide and the like are taken as carriers, the loaded transitional metal phosphide catalyst is efficiently and rapidly synthesized by a microwave heating method in an argon or hydrogen flow atmosphere. The catalyst prepared by the method has high activity and selectivity in a catalytic reaction.

The embodiment of the invention discloses a carbon nano tube surface loaded nano cobaltosic oxide composite material and a preparation method thereof. The preparation method comprises the following steps: deionized water and DMF are weighed according to a ratio of 1:1 to 1:9 to obtain a mixed solvent; purified carbon nano tube and the mixed solvent are weighed according to the compounding concentration of 0.1-1g/L, and ultrasonic processing is performed for 10-60min; cobalt(II) acetate tetrahydrate of which the concentration is 10-60g/L relative to carbon nano tube dispersion liquid is weighed, and cobalt(II) acetate tetrahydrate is dispersed in the carbon nano tube dispersion liquid and stirred evenly; the obtained mixed solution is put in a hydrothermal tank with a tetrafluoroethylene liner and then cooled along with a furnace; after the solution is cooled to room temperature, black deposits are cleaned by a centrifuge; and baking is performed until a sample is dried. Co3O4 particles of the carbon nano tube surface loaded nano cobaltosic oxide composite material prepared by the method are cubic and uniform in size, have a side length smaller than 7nm, and are uniformly distributed on the surface of the carbon nano tube.

The invention is a method for preparing a silicon nanotube, which takes the mixed powder of SiO, Si, etc. as the starting material and a small amount of rare earth elements as an indirect catalyst, evaporates the material under the conditions of high temperature and low air pressure, and causes the silicon atoms to accumulate and nucleate at a proper deposition temperature, thereby preparing the hollow-structured silicon nanotube. The method for preparing the silicon nanotube has the advantages of simple process, low-cost equipment, complete crystal structure of the nanotube, and capability for meeting the industrial requirements. The successful preparation of the nanotube provides a practicality foundation for the nanuotube to be widely applied in nanoelectronic devices in the future, and the theoretical research of the nanotube is verified from the experiment.

Manufacturing-friendly and scalable methods for the production of silicon micro- and nanostructures, including silicon nanotubes, are described. The inventive methods utilize conventional integrated circuit and MEMS manufacturing processes, including spin-coating, photolithography, wet and dry silicon etching, and photoassisted electrochemical etch processes. The invention also provides a novel mask, for maximizing the number of tubes obtained per surface area unit of the silicon substrate on which the tubes are built. The resulting tubes have thick and straight outer walls, as well as high aspect ratios.

The invention discloses a method for preparing self-cleaning fluorocarbon paint, belonging to the technical field of coatings. The method disclosed by the invention comprises the following steps: mixing hydrolytic fluorosilane and titanium dioxide, and dispersing at high speed to obtain surface-modified titanium dioxide nano-particles; and mixing varnish and carbon nano-tube dispersion, and micro-curing, thereby obtaining the self-cleaning fluorocarbon paint. The binding effect between the titanium dioxide particles and fluorocarbon resins is increased by the fluorosilane, fluorosilane molecules are hydrolyzed under acidic conditions, the hydrolyzed fluorosilane molecules are adsorbed onto the surfaces of the titanium dioxide nano-particles due to hydrogen-bond interactions, and since carbon chains in the fluorosilane molecules are protected by a fluorine atom space barrier effect, other atoms difficultly intrude. Therefore, the fluorosilane has excellent chemical stability and low surface free energy. Due to a coating layer on the fluorosilane surface, Vander Wale force of the TiO2 nano-particles to water and the hydrogen-bond interaction are reduced, and the contact angle on thecoating surface is greatly enlarged, so that super-hydrophobicity is achieved, the stain resistance can be obviously improved, and the application prospects are wide.

The present invention relates to a method for preparing self-assembled silicon nanotubes (SiNTs) by a hydrothermal method. A method for preparing self-assembled SiNTs comprises forming a mixture of silicon oxide and water in a sealed container, wherein the mixture has a silicon oxide to water ratio of no more than 10% by weight. The mixture is maintained at a constant temperature and a constant pressure, and the mixture is stirred for a period of time. Self-assembled SiNTs may be formed with an average inner diameter of less than 5 nm and an average outer diameter of around 15 nm. The present invention completely utilizes non-toxic raw materials, and the materials and process do not pollute the environment, so the method satisfies the development trends of the modern industry.

The invention belongs to the technical field of nano material preparation and discloses a silicon carbide nano tube as well as a preparation method and application thereof. The method comprises the following steps: (1) dispersing carbon nano tubes into mixed acid of concentrated nitric acid and concentrated sulfuric acid, performing ultrasonic treatment, then stirring under room temperature, centrifuging, using water to clean obtained precipitate and drying to obtain pretreated carbon nano tubes; (2) evenly grinding silicon powder and the pretreated carbon nano tubes, putting into a tube furnace to perform warming reaction and purifying a reaction product to obtain a target product silicon carbide nano tube after reaction is finished. According to the silicon carbide nano tube disclosed bythe invention, the carbon nano tubes are treated by mixed acid to remove metal impurities and amorphous carbon in the carbon nano tubes; thus, the silicon carbide nano tube disclosed by the inventioncan be generated according to the V-S reaction mechanism; the SiC nano tube is of a one-dimensional conductive network structure, can promote separation of light induced electrons and cavities and can improve the photoelectrocatalysis efficiency; the SiC nano tube material has excellent photoelectrocatalysis performance.

The invention belongs to a material technique, and particularly relates to a multi-layer graphene carbon nanotube three-dimensional carbon material-filled nanometer silicon composite material and a preparation method thereof. The preparation method comprises the following steps of preparing a nanometer silicon ethanol solution; preparing a multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material; mechanically stirring, thus uniformly mixing nanometer silicon and the multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material, and enabling one part of the nanometer silicon to enter nanometer holes of the multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material; centrifuging, spattering the nanometer silicon into the nanometer holes of the multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material, and generating a multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material-filled nanometer silicon composite material; magnetically separating the multi-layer graphene-multi-wall carbon nanotube three-dimensional carbon material from the excessive nanometer silicon ethanol solution. The prepared multi-layer graphene carbon nanotube three-dimensional carbon material-filled nanometer silicon composite material has good application value on electrode materials and energy-storage materials.

The invention relates to a preparation method of a graphite/carbon nano-tube array composite heat conducting film. The preparation method comprises the following steps: (1) supporting a catalyst layer or a catalyst precursor layer on the surface of a graphite film; (2) placing the graphite film in chemical vapor deposition equipment, depositing carbon nano-tube arrays after carrying out reduction treatment to obtain a heat conducting graphite film of which the surface is deposited with the carbon nano-tube arrays; (3) carrying out graphitization on the heat conducting graphite film of which the surface is deposited with the carbon nano-tube arrays to obtain the graphite/carbon nano-tube array composite heat conducting film. According to the invention, a special method of depositing the highly oriented carbon nano-tube arrays on the surface is adopted, so that the effective radiation area of the heat conducting graphite film is obviously increased, and the interfacial thermal resistance between the conducting film and air is reduced to obviously improve the heat transfer rates of the heat conducting film with surrounding environments such as the air per unit area to rapidly diffuse heat from the heat conducting film to the surrounding environments such as air.

Provided is a method of manufacturing silicon nanotubes including forming non-catalytic metal islands on a substrate; forming catalyst metal doughnuts to surround the non-catalytic metal islands; and growing silicon nanotubes on the catalyst metal doughnuts. The silicon nanotubes are efficiently grown using the catalyst metal doughnuts.

The invention provides a method for manufacturing amorphous carbon and multi-walled carbon nano-tube composite electrode materials on the basis of polypyrrole carbonization, and belongs to the technical field of processes for manufacturing composite nano-materials. The method includes particular preparation steps of a, sequentially adding iron trichloride and pyrrole into methyl orange aqueous solution and stirring the iron trichloride and the pyrrole at the room temperature to obtain polypyrrole; b, washing the polypyrrole until the polypyrrole is neutral, drying the polypyrrole under a vacuum condition and carbonizing the polypyrrole in a tube furnace at the temperature of 700-970 DEG C for 1-4 hours to obtain amorphous carbon; c, magnetically stirring the amorphous carbon and multi-walled carbon nano-tubes in ethyl alcohol for 4-9 hours, and drying the amorphous carbon and the multi-walled carbon nano-tubes at the temperature of 50-70 DEG C under a vacuum condition for 10-30 hours to obtain the amorphous carbon and multi-walled carbon nano-tube composite electrode materials on the basis of polypyrrole carbonization. The method has the advantages that the amorphous carbon and multi-walled carbon nano-tube composite electrode materials on the basis of polypyrrole carbonization can be used as negative electrode materials for lithium batteries and electrode materials for super-capacitors, are excellent in electrochemical performance, free of memory effects or pollution and low in self-discharge rate, and the method is low in cost and simple in process.

A process for preparing the one-dimensional silicon nanotubes with bamboo shape includes preparing multi-pore aluminium oxide template by anodizing method, depositing Au in the pores of template by AC deposition method, dissolving the template in NaOH solution to obtain Au nanoparticles, dispersing them in absolute alcohol, loading it as catalyst in ceramic utensil as the substrate to grow silicon, putting it in the center of tubular furnace, filling the mixture of SiH4 and H2, growing said silicon nanotubes on the inner surface of ceramic utencil, closing SiH4 gas, and natural cooling.

The invention discloses a silicon anode of a lithium ion battery. The silicon anode is formed by bonding a conductive agent and an anode material, the anode material comprises anode active matter and a binding material, the anode active matter comprises graphite and silicon dioxide, and the binding material is an organic solvent type binding agent. A conductive agent is of a silicon nanotube ball structure and comprises a plurality of evenly distributed silicon nanotubes, and the anode material is attached to the surfaces of the silicon nanotubes. A carbon material has high electronic conductivity and ionic conductivity, the rate capacity of the silicon material can be improved, and the volume effect of silicone in the circulating process can be inhibited. The silicon anode has high battery capacity and circulating stability.

The invention discloses a synthesis method of size-controllable silicon nanotubes for lithium ion batteries. The method comprises the steps as follows: firstly, magnetically stirring a silicon source, a template agent, a dispersant, a catalyst and a solvent at a temperature of 20-35 DEG C for 12-24 hours, and performing centrifugation and drying to obtain mesoporous silica nanorods; then dispersing the mesoporous silica nanorods in a solvent, adding a surfactant with a surface protection effect and an etching effect, heating the mixed solution to 90-150 DEG C, performing magnetic stirring for 2-12 hours, allowing the mixed solution to stand for 2-8 hours, and performing centrifugation, cleaning and vacuum drying to constant weight to obtain silica nanotubes; finally, calcining the silica nanotubes with a reducing agent in a tube furnace at 640-670 DEG C under the protection of argon for 2-4 h to obtain the silicon nanotubes. The synthesis method has the characteristics that the volume expansion effect in the processes of charge and discharge of silicon lithium ion battery anode materials can be well solved, and the length/diameter ratio and the thickness dimension of the silicon nanotubes can be effectively controlled.