31 results about "Cu doped" patented technology

The invention provides a copper-doping MgB2 superconductor and a method for preparing at low temperature. The components and the molecular mass ratio are as follows: (Mg1.1B2)1-xCux, x equals to 0.01-0.10. The preparation method is that: sufficiently mix magnesium powder, copper powder and boron powder according to a ratio in an agate mortar, then make a sheet under a pressure of 2-10 MPa, finally send the sheet into a high temperature difference indication scan calorimetric instrument or a tubular type sintering furnace to carry out low-temperature sintering, the heating rate is 10-40 DEG C / min, keep the temperature and carry out sintering for 2-7 hours when the temperature reaches 490-600 DEG C, then cool the temperature to room temperature at the rate of 10-40 DEG C / min. The analysis indicates that the sintering temperature for preparing the MgB2 superconductor is low and the sintering time is short, thus considerably remedy the defect of long sintering time of a traditional low-temperature sintering method for preparing the MgB2 superconductor, furthermore, the MgB2 superconductor prepared by the method has excellent superconductive performance. Therefore, the copper-doping sintering method is a very potential and practical production method.

The invention relates to an In, Fe and Cu triple-doped lithium niobate crystal and a preparation method thereof, relating to the lithium niobate crystal and the preparation method thereof. The method solves the problems of slow response time and low light injury resistant ability of a doped lithium tantalite crystal prepared by the prior art. The In, Fe and Cu triple-doped lithium niobate crystalis prepared by Li2CO3, Nb2O5, Fe2O3, CuO and In2O3. The method comprises the following steps: firstly, required compositions are weighed; secondly, sintering is performed; thirdly, the crystal is grown by adoption of the crystal pulling method; fourthly, polarization treatment is performed; and fifthly, oxidation treatment or reduction treatment is performed, and the In, Fe and Cu doped lithium niobate crystal is obtained. The method dopes element indium (In), ferrum (Fe) and Copper (Cu) in the lithium niobate crystal, and obviously improves the light injury resistant ability and the responsetime of the lithium niobate crystal on the basis of preserving the prior superior performance of the lithium niobate crystal.

The invention discloses a preparation method and application of a Cu-Mn double-doped ZnS quantum dot solution. First, Mn-doped ZnS nanocrystals are obtained through a nucleation doping process, that is, Mn precursors and Zn precursors are mixed and S precursors are added; after a period of reaction, Cu precursors are added, and the reaction temperature is controlled to allow the crystals to continue to grow, thereby Cu-Mn double-doped ZnS quantum dots were obtained. The prepared double-doped quantum dots have both Cu and Mn doped fluorescence emission peaks, and the Cu doped fluorescence emission peak is sensitive to the environment and can be used as an identification signal, while the Mn doped fluorescence emission peak is used as a reference signal. Therefore, the obtained Cu-Mn dual-doped ZnS quantum dots can be used as ratiometric fluorescent probes for analytical detection. The preparation method disclosed by the invention is simple, green and has good repeatability. The prepared double-doped ZnS quantum dots have good water solubility and tunable fluorescence.

The invention discloses a preparation method of an active carbon catalyst used for flue gas desulphurization and denitration, and belongs to the technical field of flue gas treatment. The preparation method of the active carbon catalyst comprises the following steps: 1, doping TiO2 with Cu: adding a copper salt into a titanium alcohol salt solution, carrying out water-bath heating to form gel, drying the gel, and grinding and sintering the dried gel to obtain Cu-doped TiO2 powder; and 2, loading the Cu-doped TiO2 powder on active carbon: adding the Cu-doped TiO2 powder, a dispersant and a binder into water, impregnating the active carbon in the above obtained solution, carrying out ultrasonic vibration, drying the vibrated solution, heating the dried solution to 400-450 DEG C according to a rate of 3-6 DEG C / min, carrying out heat insulation, and cooling the heat-insulated solution to obtain the Cu-doped TiO2 loaded active carbon catalyst. The desulphurization rate of the catalyst reaches 93.2% or above, the denitration rate of the catalyst reaches 88.7% or above; after the catalyst is regenerated, the desulphurization rate reaches 88.4% or above, and the denitration rate reaches 83.8% or above; and the catalyst has no toxicity.