Preparation method of copper oxide nanocrystal and silver/copper oxide heterostructure
A heterogeneous structure, copper oxide technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as aggregation and difficulty in catalyst recovery, and achieve Achieving the effect of controllable selection
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Embodiment 1
[0064] 120 μL of different concentrations of Cu(NO 3 ) 2 The aqueous solution was added dropwise to the surface of the base mica sheet, in which Cu(NO 3 ) 2 The concentrations of the aqueous solutions are 0.05M, 0.15M, 0.25M and 0.5M respectively, and the size of the mica sheet is 8mm×8mm. in N 2 Cu(NO 3 ) 2 Aqueous solution, evaporation time is 5s, N 2 Flow rate is 300cm 3 / s (weak airflow). The nitrogen flow creates a local nitrogen atmosphere on the surface of the mica flakes. In the established nitrogen atmosphere, Cu(NO 3 ) 2 The water in solution was evaporated under a nitrogen atmosphere. The substrate was then quickly transferred to a desiccator and dried for 4 hours. The treated substrate is then calcined step by step to prepare CuO nanocrystals supported by the substrate; the step-by-step calcination conditions include: heating from room temperature to 100°C for half an hour; heating from 100°C to 250°C for 1 hour; 250°C Calcined under 4h.
[0065] The ...
Embodiment 2
[0068] According to the method of Example 1, 120 μL of Cu(NO 3 ) 2 The aqueous solution was added dropwise to the surface of the base mica sheet, and other steps were the same as in Example 1 to prepare CuO nanocrystals supported by the base. Observing the structure of CuO nanocrystals on the surface of the mica sheet under different magnifications, the results are as follows figure 2 shown. When the concentration of copper nitrate thin layer precursor solution increased to 1.5M, the density of the prepared nanosheets further increased. Such as figure 2 As shown, the surface of the mica substrate is completely covered by dense nanosheets, and many nanosheets spontaneously assemble into microspheres with a diameter of about 2 μm and a flower-like layered structure ( figure 2 C).
Embodiment 3
[0070] 120 μL of 1.5M Cu(NO 3 ) 2 The aqueous solution is dripped onto the surface of the base mica sheet, and the size of the mica sheet is 8mm×8mm. in N 2 Rapid evaporation of Cu(NO 3 ) 2 Aqueous solution, evaporation time is 5s, N 2 Flow rate is 500cm 3 / s (strong airflow). The substrate was then quickly transferred to a desiccator and dried for 4 hours. The treated substrate is then calcined step by step to prepare CuO nanocrystals supported by the substrate; the step-by-step calcination conditions include: heating from room temperature to 100°C for half an hour; heating from 100°C to 250°C for 1 hour; 250°C Calcined under 4h.
[0071] Observing the structure of CuO nanocrystals on the surface of the mica sheet under different magnifications, the results are as follows image 3 shown. Such as image 3 As shown, only flower-like layered microspheres grow on the surface of the mica substrate, and the diameter of the spheres is about 1.5 μm. A "petal"-like structur...
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