855 results about "Tetramethylammonium hydroxide" patented technology

A transistor includes a notched fin covered under a shallow trench isolation layer. One or more notch may be used, the size of which may vary along a lateral direction of the fin. In some embodiments, The notch is formed using anisotropic wet etching that is selective according to silicon orientation. Example wet etchants are tetramethylammonium hydroxide (TMAH) or potassium hydroxide (KOH).

The invention includes methods in which silicon is removed from titanium-containing container structures with an etching composition having a phosphorus-and-oxygen-containing compound therein. The etching composition can, for example, include one or both of ammonium hydroxide and tetra-methyl ammonium hydroxide. The invention also includes methods in which titanium-containing whiskers are removed from between titanium-containing capacitor electrodes. Such removal can be, for example, accomplished with an etch utilizing one or more of hydrofluoric acid, ammonium fluoride, nitric acid and hydrogen peroxide.

A polishing composition includes silicon dioxide, an alkaline compound, an anionic surfactant, and water. The silicon dioxide is, for example, colloidal silica, fumed silica, or precipitated silica. The alkaline compound is, for example, potassium hydroxide, sodium hydroxide, ammonia, tetramethylammonium hydroxide, piperazine anhydride, or piperazine hexahydrate. The anionic surfactant is at least one selected from a sulfonic acid surfactant, a carboxylic acid surfactant, and a sulfuric acid ester surfactant. The polishing composition can be suitably used in applications for polishing a silicon wafer.

The invention discloses a preparation method of a TiO2/ZIF-8 nanocomposite with a core-shell structure. The preparation method comprises the following steps: firstly, tetrabutyl titanate is added to an ethylene glycol solution and stirred uniformly, the mixture is added to anhydrous acetone, stirred quickly and left to stand, and TiO2 amorphous nano-beads are obtained through separation, washing and drying; the nano-beads are added to a tetramethylammonium hydroxide aqueous solution and react at 160-200 DEG C, and TiO2 nano-beads are obtained through separation, washing and drying; the prepared TiO2 nano-beads are added to a methanol solution of Zn(NO3)2*6H2O and are stirred, a methanol solution of 2-methylimidazole is then added, and the TiO2/ZIF-8 nanocomposite with the core-shell structure is obtained through separation, washing and drying. The preparation method has mild preparation conditions and simple process; the synthesized TiO2/ZIF-8 composite has uniform size and good dispersity and is expected to be applied to gas separation, photoelectric materials, photocatalytic materials and the like.

The invention relates to a quaternized modified amino silicone oil softener and preparation and application thereof. The softener comprises the following general formula in the specification. The preparation comprises the following steps of: (1) adding octamethylcy-clotetrasiloxane into a container, adding a coupling agent N-beta-(aminoethyl)-gamma-aminopropyl methyl dimethoxysilane into the container dropwise, adding a tetramethyl ammonium hydroxide catalyst and subsequently a capping agent hexamethyl disiloxane into the container, and then performing reduced pressure distillation to obtain amino silicon oil; (2) dissolving the amino silicon oil into a solvent, adding the mixture into epichlorohydrin, stirring and heating to react under the protection of nitrogen, and removing the solvent by steaming to obtain an intermediate product; and (3) uniformly mixing N,N-dimethyl-decanamide and the solvent to obtain a mixture, stirring with heating, adding the intermediate product dropwise into the mixture under the protection of nitrogen, performing a thermostatic reaction, and removing the solvent by steaming to obtain the product. The softener of the invention has high hydrophilicity and high stability; fabric processed by the softener has excellent soft handfeel, high hydrophilicity, low yellowing, antibacterial property and the like; and the softener is simple to prepare and is suitable for industrial production.

A cleaning solution is provided for cleaning copper-containing microelectronic substrates, particularly for post etch, post-CMP or Via formation cleaning. The cleaning solution comprises a quaternary ammonium hydroxide, an organic amine, a corrosion inhibitor, and water. A preferred cleaning solution comprises tetramethylammonium hydroxide, monoethanolamine, gallic acid, and water. The pH of cleaning solution is greater than 10.

Various methods for selectively etching metal-containing materials (such as, for example, metal nitrides, which can include, for example, titanium nitride) relative to one or more of silicon, silicon dioxide, silicon nitride, and doped silicon oxides in high aspect ratio structures with high etch rates. The etching can utilize hydrogen peroxide in combination with ozone, ammonium hydroxide, tetra-methyl ammonium hydroxide, hydrochloric acid and/or a persulfate. The invention can also utilize ozone in combination with hydrogen peroxide, and/or in combination with one or more of ammonium hydroxide, tetra-methyl ammonium hydroxide and a persulfate. The invention can also utilize ozone, hydrogen peroxide and HCI, with or without persulfate. The invention can also utilize hydrogen peroxide and a phosphate, either alone, or in combination with a persulfate.

The invention discloses a method for preparing electronic-grade tetramethylammonium hydroxide (TMAH), belonging to the field of electrochemistry. In the method, tetramethylammonium bicarbonate is used as a raw material for electrolysis, a dual-film electrolyzer is used for preparing the electronic-grade TMAH, and the whole electrolyzer implements cyclic stirring of the electrolyte in the electrolytic process in an external cycle mode. The electrolytic conditions are as follows: the cathode tank uses a 0.2-0.5 mol/L TMAH solution; the buffer tank uses a 1.0-3.0 mol/L TMAHCO3 solution; the anode tank uses a 0.2-0.6 mol/L Na2SO4 solution; the temperature for electrolysis is 40-60 DEG C; and the current density is 400-1000 A/m<2>. The invention has the advantages of simple technological process, low raw material cost, high product yield (the content of metallic ions in the product is lower than 4ppm, achieving the standard for electronic-grade TMAH), high electrolytic-current efficiency (up to 80-90%), environmental protection, no pollution and high production safety.

The invention discloses a method for directly synthesizing a mesoporous material coated heteropolyacid functionalized MOF material, and relates to a method for a mesoporous material coated polyacid modified metal organic framework material, wherein a mesoporous molecular sieve, phosphorus molybdenum heteropoly acid, tetramethylammonium hydroxide, 1,3,5-trimesic acid, and Cu(NO3)2.3H2O are adopted as raw materials, a hydrothermal synthesis method is adopted, and water is adopted as a solvent to carry out one step synthesis at a temperature of 90-230 DEG C to obtain the target material. The catalysis material synthesized by the method is applied in the benzene hydroxylation reaction, wherein the good stability performance of the material is presented under the mild reaction conditions.

The invention discloses a preparation method of monolayer manganese dioxide nano-plates, including the following steps: (1) manganese nitrate is reacted with sodium hydroxide or potassium hydroxide with the existence of oxidant to produce NaxMnO2 or KxMnO2 having ordered laminated structure; (2) the NaxMnO2 or KxMnO2 having ordered laminate structure is added to sodium hydroxide aqueous solution, OHxMnO2 is obtained by hydro-thermal synthesis method, and the obtained OHxMnO2 is fully acid-cleaned to obtain HxMnO2; (3) tetrabutylammonium hydroxide or tetramethylammonium hydroxide is used for reacting with laminated HxMnO2, and the tetrabutylammonium hydroxide or tetramethylammonium hydroxide is inserted inside the laminated HxMnO2 so that the laminated HxMnO2 is dispersed into monolayer manganese dioxide nano-plates. The manganese dioxide nano-plates obtained in the invention have monolayer with the thickness of just 0.3 to 0.8 nm; and as electrode material, the chemical performance of manganese dioxide nano-plate electrode is obviously higher than that of carbon nanotube electrode.

The invention relates to a preparation method for high-viscosity 107 glue. The preparation method comprises the following steps of: adding a certain amount of DMC (Dimethyl Carbonate) and 107 glue of which the viscosity is 100-1,500 cs or a certain amount of DMC into a reactor provided with a stirrer, a thermometer and a condensation reflowing pipe, starting stirring, heating to a certain temperature, and adding an alkali catalyst, wherein the alkali catalyst comprises one of potassium hydroxide, tetramethylammonium hydroxide pentahydrate, tetrabutyl phosphorus oxychloride or silicon alkoxidealkali gel of the alkalis; undergoing a balanced reaction at the temperature for certain hours, and directly neutralizing or heating for decomposing the alkali catalyst; and adding a phosphoric acid or silanol hydrochloric acid gel neutralizing agent of which the mass is equal to that of the catalyst under the condition that neutralization is performed, or directly heating for decomposing the alkali catalyst under the condition that neutralization is not performed, continuously stirring for 1 hour, and removing low-boiling-point substances. The high-viscosity 107 glue prepared with the methodhas the advantages of simple preparation process, stable viscosity, high product yield and capability of meeting production requirements.

Disclosed is the direct conversion process for producing biodiesel from a biomass. The direct conversion process for producing biodiesel from a biomass comprises reacting a feed stock comprising a biomass and an alkylation reagent in a substantially oxygen free environment at a temperature sufficient to hydrolyze one or more lipid glycerides in the biomass and alkylated one or more fatty acids in the reaction. The process may comprise reacting a feed stock comprising an algal biomass and tetramethylammonium hydroxide in a substantially oxygen free environment at a temperature between 250° C. and 500° C. The direct conversion process for producing biodiesel may further comprise reacting oil containing lipid glycerides with an alkylation reagent at a sufficient temperature to esterify the oil. The fatty acid alkyl esters produced from the reacted feed stock are recovered. The recovered fatty acid alkyl esters, as an essential component of biodiesel, may be formulated into biodiesel.

The invention belongs to the technical field of preparation of nano-functional materials, in particular to a method for preparing a nitrogen doped carbon nanotube three-dimensional composite materialby in-situ growth of a few layers of titanium carbide, immersing ternary layered Ti3AlC2 ceramic powder in hydrofluoric acid solution, heating and stirring, centrifugally cleaning with ultrapure waterand absolute ethanol, drying to obtain two-dimensional layered titanium carbide nano-powder, adding it into tetramethylammonium hydroxide solution, heating and stirring, centrifuging with deionized water to obtain a few layers of titanium carbide nano-sheet dispersion; Adding cobalt salt into a dispersion of a few layers of titanium carbide nano-sheets for reaction, adding dicyandiamide, heatingand stirring until dicyandiamide is completely dissolved, freezing, and freeze-drying to obtain precursor powder; Nitrogen-doped carbon nanotubes (CNTs) three-dimensional composites were prepared by in-situ growth of a few layers of titanium carbide after grinding the precursor powder and heat treatment. A three-dimensional composite material is prepared by a simple pyrolysis method using a few layers of titanium carbide as a carrier, cobalt as a catalyst, dicyandiamide as a carbon and nitrogen source, and the electrochemical performance of the few layers of titanium carbide can be improved.

The invention discloses a method for preparing electronic grade tetramethylammonium hydroxide by a continuous method. The method comprises the following steps of: sequentially dividing an electrolytic cell into a cathode chamber, a first cathode middle chamber, a second cathode middle chamber and an anode chamber, wherein the two adjacent chambers are partitioned by a cation exchange membrane and connected by using a circulating pump and a filter connected in series, and the anode chamber is connected with the circulating pump and the filter connected in series; putting a 5 to 50 percent aqueous solution of a tetramethyl ammonium salt into the anode chamber, wherein (CH3)4N<+>, H<+> and metal cation R<+> in the solution enter the two cathode middle chambers and the cathode chamber through the cation exchange membranes; and removing the sediment generated by partial metal cation R<+> and OH<-> by using the filter, pumping the filtrate for reaction by using the circulating pump, and discharging the 5 to 30 percent tetramethylammonium hydroxide from the cathode chamber, wherein the concentration of each metal ion is less than 10ppb, the concentration of each anion is less than 500ppb, and the tetramethylammonium hydroxide has high purity. The current efficiency of the tetramethylammonium hydroxide is 70 to 80 percent, the tetramethylammonium hydroxide has high utilization rate, and the method has no pollution and can be used for large-scale production.

A semiconductor die is formed in a process that forms a hole through the wafer prior to the formation of the contacts and the metal-1 layer of an interconnect structure. The through-the-wafer hole is formed by using a wafer with a <110> crystallographic orientation and a wet etch, such as with ethanol (KOH) or tetramethylammonium hydroxide (TMAH).

The present invention relates to a CMP (chemical mechanical polishing) slurry composition and a method for planarizing a semiconductor device. The CMP composition comprises fumed silica, tetramethyl ammonium hydroxide, phosphates, fluorine compounds and deionized water. The method of planarizing comprises the steps of etching, subsequently laminating and polishing a semiconductor device by said CMP slurry composition.

The invention discloses a device and method for continuously preparing tetramethylammonium hydroxide, aiming to solve the problems of high production cost and high impurity content of the existing tetramethylammonium hydroxide production methods. The device comprises an ion exchange column, an electrolytic cell, an anode material tank, a cathode material tank, a cathode gas storage tank, an anode gas storage tank, a boiler, a heating trough, a first liquid pump, a second liquid pump, a third liquid pump, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline. In the method, a tetramethyl ammonium bicarbonate aqueous solution is taken as anode liquor, a tetramethyl ammonium hydroxide dilute solution is taken as cathode liquor, through the mutual cooperation of the production device and a process, the process flow can be effectively shortened, and the production cost can be significantly reduced. The device and method disclosed by the invention are short in process flow, simple in operation and low in production cost, and prepared products are high in purity and high in yield, so that the energy efficiency is effectively reduced, and the defects of high power consumption and low current efficiency existing in the prior art are overcome, therefore, the device and method disclosed by the invention can adapt to the needs of industrial production.

Silicon etchants described herein are aqueous solutions that comprise at least one of potassium hydroxide or tetramethyl ammonium hydroxide; at least one additive, wherein the additive comprises at least two of the following physical properties: water-soluble, non-volatile and non-flammable; and an aqueous environment that comprises at least one solvent or solvent blend. Methods of producing a selective silicon etchant include: a) providing at least one of potassium hydroxide or tetramethyl ammonium hydroxide; b) providing at least one additive, wherein the additive comprises at least two of the following physical properties: water-soluble, non-volatile and non-flammable; c) providing an aqueous environment that comprises at least one solvent or solvent blend; and d) blending the at least one potassium hydroxide or tetramethyl ammonium hydroxide with the at least one additive in the aqueous environment in order to form a solution that can be utilized as a selective silicon etchant.

A cleaning solution is provided for cleaning metal-containing microelectronic substrates, particularly for post etch, via formation and post CMP cleaning. The cleaning solution consists of a quaternary ammonium hydroxide, an organic amine, and water. A preferred cleaning solution consists of tetramethylammonium hydroxide, monoethanolamine, and water. The pH of cleaning solution is greater than 10.