68results about How to "Increased concentration of oxygen vacancies" patented technology

The invention provides a surface treatment method of metal oxide semiconductor and a preparation method of a thin film transistor, wherein the surface treatment method of the metal oxide comprises the following steps that: plasmas are utilized for carrying out surface treatment on a device to be treated; and the plasmas comprise mixed gas of F-base gas and O2, and the device to be treated is a metal oxide semiconductor product or a product plated with the metal oxide semiconductor. In the embodiment provided by the invention, the plasmas obtained by using the mixed gas of F base gas and O2 are used for treating the metal oxide for enhancing the oxygen vacancy concentration in the metal oxide, reducing the contact resistance between the metal oxide and other electrodes and improving the ohm contact effect of the metal oxide.

The invention discloses a bismuth-phosphate-based composite photocatalytic material. The bismuth-phosphate-based composite photocatalytic material comprises fluorine-nitrogen-codoped bismuth phosphate, bismuth tungstate and bismuth vanadate at a molar ratio of 1 to (0.1-0.3) to (0.1-0.3). The invention further discloses a preparation method of the bismuth-phosphate-based composite photocatalytic material. The preparation method comprises the steps of dissolving bismuth nitrate pentahydrate in a nitric acid solution, adding a mixed solution of phosphate, ammonium tungstate, ammonium metavanadate and sodium hydroxide solution, and carrying out microwave hydrothermal reaction, centrifugation and drying, so as to obtain the bismuth-phosphate-based composite photocatalytic material. According to the bismuth-phosphate-based composite photocatalytic material, by virtue of codoping of nonmetal fluorine and nitrogen ions, the capacity for capturing electrons at an interface among three semiconductors including bismuth phosphate, bismuth tungstate and bismuth vanadate is effectively improved, and the migration efficiency of electron holes is increased; the three semiconductors are compounded at the interface and can form a heterogeneous structure, so that the separation of photon-generated carriers is effectively promoted, and the photocatalytic activity of a composite system is improved.

The invention discloses an in- situ control method for the form and the crystal face of nano cerium oxide, and belongs to the technical field of rare earth nano materials. Organic alcohol used as a dispersing agent is combined with a cavitation effect to disperse and shear a nano template. A alkaline matter is used as a cerium source precipitator, the size of the nano template and an aggregation state of the same in a reaction system are controlled by adjusting viscosity and surface tension of the dispersing agent, so that a cerium precursor is adsorbed on the surface of the nano template and grows in a preferred orientation, and thus a growth speed of each crystal face of the cerium oxide is finally controlled, and control on the form and the crystal face of the nano cerium oxide in a nanoscale range is achieved. The method provided by the invention is simple in preparation technology, moderate in reaction condition and easy to acquire reaction material; no surfactant is added, and the added nano template has no residual and consumes a part of oxygen by calcining and oxidation, so that the purified cerium oxide is acquired and meanwhile oxygen vacancy concentration can be increased, and thus the method is wide in application prospect.

The invention discloses a preparation process of a metal oxide thin film transistor (Metal oxide thin film transistor, MOTFT). First, the active layer with optimal O content is employed to improve the EBS stability of the MOTFT. Second, the Mg-doped active layer is used to improve the UV light stability of the MOTFT. Finally, use rich In2O3 or pure ZnO active layer to improve the mobility of MOTFT.

The invention relates to a preparation method and application of a photocatalyst, copper calcium titanate containing high-density oxygen vacancy. The preparation method includes: utilizing a one-step molten salt method; controlling morphology and oxygen vacancy content by changing molten salt composition during synthesis; using metal oxide as a raw material; grinding and calcining the raw material to form a high-purity photocatalyst; calcining before washing the high-purity photocatalyst. The preparation method has the advantages of few raw material type, simple operation, adjustable molten salt composition, mild condition and simple process. A copper calcium titanate photocatalysis material obtained by the preparation method is high in yield, uniform in distribution and free of introduction of other mixed elements; by introducing oxygen vacancy, compositing of photo-induced electron hole pairs can be inhibited effectively, and the material is endowed with excellent visible light photocatalysis performance and is better than a commercial star photocatalysis material, titanium dioxide (P25). The defect that visible light cannot be used due to wide oxide band gap is overcome, and the defect that sulfide is unstable is made up due to the characteristic that the catalyst is of a diamond-like structure.

The invention discloses a cerium-based core-shell structure catalyst and a preparation method thereof, wherein the core-shell structure is synthesized by using pulsed laser. According to the present invention, through the interaction between cerium oxide and silver, the catalytic performance of the catalyst is enhanced, and the activity and the stability of the catalysis of the cerium-based catalyst on soot particulates are improved so as to reduce the emission of pollutants and reduce air pollution.

The invention discloses layered manganese oxide with water resistance and sulfur poisoning resistance and a preparation method and application thereof, and belongs to the technical field of catalyticmaterials. The preparation method comprises the following steps: adding a KMnO4 solution into chain alcohol, or adding chain alcohol into a KMnO4 solution, and then reacting at the condition of 10-38DEG C for 6-48 h; and filtering after the reaction, washing a precipitate and drying to obtain layered manganese oxide. The carbon atom number of the chain alcohol is less than or equal to 4; and theraw materials are continuously stirred or vibrated during the addition process and the reaction process. The chain alcohol is preferably methanol or ethanol. When applied to catalytic combustion of volatile organic compounds, the prepared layered manganese oxide has advantages of high specific surface area, high catalytic activity, strong catalytic stability, excellent water resistance, sulfur poisoning resistance and the like.

The invention discloses a monolithic catalyst for catalytic oxidation of wet VOCs-containing tail gas. The catalyst comprises a cordierite honeycomb carrier, a composite zirconia coating doped with rare earth components and supported on the carrier, active components loaded on the coating, and hydrophobic components covering the surface of the catalyst. The invention further discloses a preparation method of the catalyst and application of the catalyst in catalytic oxidation of the wet VOCs-containing tail gas. The composite zirconia coating doped with the rare earth components, an active component coating and a hydrophobic component coating are sequentially prepared on the carrier through a step-by-step impregnation method. The rare earth components in the catalyst improve the oxygen supply capacity of the composite zirconia coating and the activity of the catalyst, and the hydrophobic components on the surface of the catalyst avoid the activity decrease of the catalyst and improve the water vapor resistance of the catalyst. The preparation method of the catalyst is simple and easy to achieve, and the catalyst has high catalytic efficiency and a wide use range and is suitable forcatalytic oxidation of the wet VOCs-containing tail gas at low temperature.

The invention discloses a method for preparing a transparent conductive film and belongs to the technical field of photoelectric materials. The method comprises the following steps of providing a base, carrying out thorough ultrasonic cleaning on the base, spin-drying the cleaned base, drying the base by an oven, putting the dried base into a magnetron sputtering chamber, carrying out vacuum-pumping on the magnetron sputtering chamber, feeding high-purity Ar, O2 and assistant reaction gas which is one of H2 and a H-rich compound into the magnetron sputtering chamber, keeping the pressure intensity in the magnetron sputtering chamber in a range of 0.3-1Pa, carrying out sputtering on the target material so that a transparent conductive film is formed on the base, and carrying out annealing treatment on the transparent conductive film at an annealing temperature of 150-200 DEG C. Through use of H-rich gas such as H2 in the sputtering deposition, the transparent conductive film having low resistivity and high transmittance can be obtained under low-temperature annealing conditions in short time so that an annealing temperature and a production cost are greatly reduced.

The invention belongs to the technical field of materials, and provides a preparation method and application of a modified material based on titanium dioxide, which comprises the following steps: dissolving a certain amount of boric acid and rhodium chloride trihydrate in water containing nitric acid and alcohol to obtain a solution A; dropwise adding isopropyl titanate into the ethanol solution at the temperature of 0-4 DEG C to obtain a solution B; slowly dropwise adding the solution A into the solution B to obtain titanium dioxide sol; aging the titanium dioxide sol at room temperature, andperforming drying to obtain xerogel; and finally, grinding the dry gel into powder, and calcining the powder in air for 4 hours to obtain the boron-rhodium co-doped titanium dioxide, namely the titanium dioxide-based modified material. The material is used for photocatalytic hydrogen production, and the catalytic hydrogen production efficiency is effectively improved. The boron-rhodium co-doped titanium dioxide is prepared by adopting a one-pot sol-gel method, the absorption bandwidth of the titanium dioxide can be regulated and controlled by adjusting the rhodium doping proportion, and the light absorption and carrier separation efficiency is improved.

The invention discloses a Sm-Gd-Dy tri-rare-earth ion tantalate and a preparation method and application thereof. The general chemical formula of the Sm-Gd-Dy tri-rare-earth ion tantalate is SmGdDy<c>TaO<7>, wherein the a, b and c meet the relationship of a+b+c=3 and are separately in a range of 0.8-1.2. The preparation method comprises the following steps: (1) weighing samarium nitrate, gadolinium nitrate, dysprosium nitrate and tantalum oxalate according to a stoichiometric ratio, performing mechanical mixing with citric acid with a preset amount under a heat preservation condition, adding a concentrated ammonia water neutralization solution during the mixing process, and carrying out mechanical mixing to promote a complexation reaction under a heat preservation condition; and (2)drying the obtained solution, and then carrying out calcination at a high temperature to remove carbon impurities to obtain the Sm-Gd-Dy tri-rare-earth ion tantalate powder. The Sm-Gd-Dy tri-rare-earth ion tantalate has good high-temperature thermal stability and low thermal conductivity, and can be used as a thermal barrier coating material.