9 results about "Tungsten atom" patented technology

The invention discloses a width gradient tungsten disulfide nanobelt, a preparation method thereof and an application of the width gradient tungsten disulfide nanobelt in a self-driven photoelectric detector, a Ni film is deposited on a substrate and is annealed to form catalytic particles, and a chemical vapor deposition system is utilized to accurately control the temperature gradient between tungsten trioxide in a central temperature zone and a growth substrate in a downstream temperature zone, so that the width gradient tungsten disulfide nanobelt is obtained. And the solid sulfur source is propelled at a constant rate, the dynamic change of the sulfur / tungsten atomic ratio in the reaction environment is regulated and controlled, and a growth mode is guided to be converted from a gas-liquid-solid mechanism to a gas-solid mechanism, so that controllable preparation of the tungsten disulfide nanobelt with the width continuously and progressively decreased in the axial direction is realized. The width of the nanobelt gradually changes from 150-500 nm to 50-120 nm, the length of the nanobelt reaches 3-12 [mu] m, and the nanobelt has an armchair edge and a 3R phase stacking structure. A self-driven photoelectric detector constructed based on the nanobelt realizes high-sensitivity detection of 532 nm laser under zero bias voltage, the responsivity reaches 5.04 A / W, the detectivity reaches 3.23 * 10 < 12 > Jones, and the nanobelt shows important application value in the fields of optical signal detection, optical switches and wireless optical communication.

To provide a treatment liquid for a semiconductor device which is excellent in corrosion resistance of a cobalt atom-containing layer and a tungsten atom-containing layer and excellent in removability of fluorine-based residues.SOLUTION: A treatment liquid for a semiconductor device contains a fluorine-containing compound, a cyclic ether compound, diaminoalkane, and water.SELECTED DRAWING: None

The invention discloses a cobalt and tungsten co-doped ruthenium dioxide electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of hydrogen production by electrocatalytic water decomposition. The electrocatalyst provided by the invention comprises RuO2 nanoparticles, tungsten atoms and cobalt atoms, wherein the tungsten atoms and the cobalt atoms are doped in the RuO2 nanoparticles. Tungsten atoms and cobalt atoms are doped in crystal lattices of RuO2 nano-particles to form a complex (CoW-RuO2), the electron transmission capacity of the catalyst is regulated and controlled through introduction of heteroatoms, then the center of an O < 2 > p band moves downwards, the formation energy of oxygen vacancies in CoW-RuO2 is remarkably increased, and soluble high-valence Ruxgt is prevented; and 4, generating. In addition, the preparation method provided by the invention has the characteristics of simple process steps, safety, easy control, easily available raw materials, small environmental pollution, mild experimental conditions, short time consumption, low cost and the like. The prepared catalyst has a wide application prospect in an electrolytic water oxygen evolution reaction in an acid environment.

This invention provides a topological quantum device and a method for manufacturing the same, in which an oxide film that suppresses the penetration of Cooper pairs from an S-wave superconductor into a two-dimensional topological insulator is substantially absent. [Solution] The quantum device 2 comprises a two-dimensional topological insulator 6, which is a single layer of tungsten ditelluride having a 1T'-type crystal structure and is disposed on or above the support 4, and a coating 8 covering the two-dimensional topological insulator, which includes an S-wave superconductor 10 having W atoms, Te atoms, and metal atoms. The S-wave superconductor is positioned so that Cooper pairs can penetrate from the S-wave superconductor into the edges of the two-dimensional topological insulator.

This invention discloses a fullerene-based (Mo2C-WC) / C 60 An electrocatalyst, its preparation method, and its application are disclosed. The electrocatalyst is composed of molybdenum oxide, tungsten oxide, and fullerene. The molar ratio of molybdenum atoms to tungsten atoms is (0.5~2):1, and the ratio of the sum of the molar numbers of molybdenum and tungsten atoms to the molar number of carbon atoms in the fullerene is 1:20. The preparation method includes the following steps: mixing fullerene, molybdenum oxide, and tungsten oxide to prepare a mixed precursor; calcining the mixed precursor at high temperature under an argon atmosphere to obtain a (molybdenum carbide-tungsten carbide) / fullerene carbon material; acid washing the (molybdenum carbide-tungsten carbide) / fullerene carbon material to remove the metal elements generated in the reaction; and finally drying to obtain a fullerene-based (Mo2C-WC) / C material. 60 Electrocatalyst. The electrocatalyst of this invention forms a unique W-Mo heterojunction with a large specific surface area and electrochemical active area, which exposes more active sites, thereby greatly enhancing the catalyst's ability to electrocatalyze hydrogen evolution.

The invention discloses a tungsten-doped molybdenum carbide heterojunction photo-thermal catalyst and a preparation method and application thereof. According to the invention, ammonium molybdate and ammonium tungstate are used as metal sources, aniline is used as an organic carbon source and a morphology guiding agent, a hybrid precursor is formed through self-assembly in a liquid phase, and high-temperature in-situ carbonization reduction is carried out in an inert or reducing atmosphere. The prepared catalyst keeps regular nanowire morphology, doping of tungsten atoms induces lattice distortion and partial crystalline phase transformation of molybdenum carbide, an atomic-scale coupled alpha-MoC / beta-Mo2C heterojunction is constructed, rich molybdenum vacancy defects are generated in situ, and in a solar-driven reverse water-gas shift reaction, the molybdenum vacancy defects are reduced, so that the catalyst has a good application prospect. Excellent photo-thermal conversion efficiency, catalytic activity and CO selectivity are shown; the oxygen traction effect generated by the oxyphilic characteristic of tungsten atoms is utilized to stabilize surface active sites, and the oxidation resistance of the catalyst under high-temperature photo-thermal conditions is improved. The preparation process is simple, the controllability is high, and an effective technical scheme is provided for solving the problem of poor stability of a non-noble metal carbide catalyst.

The present invention addresses the problem of providing an infrared-absorbing fiber containing composite tungsten oxide particles having excellent infrared-absorbing performance. An infrared absorbing fiber according to the present invention comprises a fiber and composite tungsten oxide particles provided at one or more positions selected from the inside and the surface of the fiber, the composite tungsten oxide particles comprising a composite tungsten oxide represented by the general formula MxWyOz (0.20 < = x / y < = 0.37, 2.2 < = z / y < = 3.3) and having a hexagonal crystal system, and the composite tungsten oxide particles have a particle diameter of 1-5 [mu] m and a particle diameter of 1-5 [mu] m. A STEM-HAADF image incident from [001] contains 0.01% to 10% of spots in which the Z contrast of tungsten atoms is reduced to 95% or less of the average value, in a number ratio.

The invention relates to the technical field of functional oxide materials, and particularly discloses tungsten-doped tin oxide nano-powder and a preparation method thereof.Molecular-level uniform mixing and complexing of tin ions and tungsten ions are achieved through a composite complexing agent system with a specific proportion under the action of an ultrasonic field; then, direct crystallization is carried out under a mild hydrothermal condition to form the tin dioxide nanocrystals uniformly doped with tungsten atoms, and a high-temperature calcination step which is essential in a traditional process is omitted, so that the problem that in a traditional tungsten-doped tin dioxide nanopowder preparation technology, the tungsten atoms are uniformly doped with the tin dioxide nanocrystals is solved; the preparation method solves the problems of complex process flow, non-ideal doping uniformity, crystal grain agglomeration caused by high-temperature post-treatment or high equipment cost in the prior art, and has the advantages of simplified process subversiveness, improved doping uniformity, accurate and controllable morphology and structure, environmental protection, excellent product performance and the like.

The application discloses an online nondestructive testing device for a fuel rod sealing welding point tungsten inclusion, and at least comprises an X-ray tube, a detector and an analysis processing unit, X-rays emitted by the X-ray tube irradiate a fuel rod sealing welding point to be detected to excite tungsten elements in the sealing welding point; characteristic X-ray fluorescence is generated in a de-excitation process of the excited tungsten elements, and energy spectrum measurement of the characteristic X-ray fluorescence is completed by the detector; the energy spectrum of the characteristic X-ray fluorescence is processed by the analysis processing unit, tungsten atomic Kalpha characteristic X-ray fluorescence net peak count is extracted, and qualitative and quantitative analysis of tungsten element content in the fuel rod sealing welding point to be detected is realized based on standard rod database information. Through the online nondestructive testing device, nondestructive and efficient detection of the fuel rod sealing welding point inclusion tungsten is realized. Moreover, through measurement of Kalpha rays, since the energy is high, the detection depth can reach >0.5mm.