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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

Active Publication Date: 2021-04-30
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in addition to the problem of spontaneous aggregation of these nanoparticles, on the other hand, the recovery of the catalyst also encountered many difficulties.
At present, substrate-supported nanocrystals have been successfully applied in the field of catalysis, however, there are few reports on substrate-supported clean and layered porous CuO nanocrystals.

Method used

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  • Preparation method of copper oxide nanocrystal and silver/copper oxide heterostructure
  • Preparation method of copper oxide nanocrystal and silver/copper oxide heterostructure
  • Preparation method of copper oxide nanocrystal and silver/copper oxide heterostructure

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Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a method for preparing copper oxide nanocrystals: forming a layer of copper salt aqueous solution on a substrate with a hydrophilic surface, evaporating water in the copper salt aqueous solution under an inert gas flow, and the concentration of the copper salt aqueous solution is 0.05- 1.5mol / L, the evaporation time is 5‑60s, and the flow rate of inert gas flow is 200cm 3 / s‑800cm 3 / s; drying the processed copper salt aqueous solution to form copper salt precursor nanocrystals on the surface of the substrate; calcining the above-mentioned treated substrate step by step to form copper oxide nanocrystals on the substrate surface; wherein the stepwise calcination conditions include: The temperature was raised from 100°C to 250°C at a rate of 2.5°C / min; then calcined at a constant temperature of 250°C for 4h. The present invention also provides a method for preparing a silver / copper oxide heterostructure, using the copper oxide nanocrystals prepared above, further comprising: immersing the substrate with copper oxide nanocrystals in an aqueous solution of silver salt, using alcohols as the space As a hole-scavenging agent, the silver nanoparticles are loaded on the surface of copper oxide under natural light.

Description

technical field [0001] The invention relates to the technical field of preparation of nanostructures, in particular to a method for preparing copper oxide nanocrystals and silver / copper oxide heterostructures. Background technique [0002] Controlling the morphology of nanocrystals is crucial to understanding their size effects and morphology effects and exploring practical applications. For example, the strong plasmonic effect of gold nanocrystals is inseparable from their size and shape, and has been initially applied to sensing and detection. Similarly, the plasmonic effect of silver nanocrystals is also affected by their size and shape. The current study shows that the catalytic reaction is a structure-sensitive process. For example, during the catalytic oxidation of glucose, the {100} facets of cubic gold nanocrystals are more active than the {110} facets of rhombohedral dodecahedrons and the {111} facets of octahedral gold. Therefore, controlling the morphology of n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J37/08B01J35/10B82Y30/00B82Y40/00C02F1/30
CPCB82Y30/00B82Y40/00C02F1/30B01J23/8926B01J37/088C02F2101/308C02F2305/10B01J35/60B01J35/39
Inventor 吴继红冯峰代婷婷毛耀全
Owner SUZHOU UNIV