Method for preparation of Cu2O and Au/Cu2O core-shell heterostructure nano cube through thermal oxidation

A nano-cube and heterojunction technology, applied in the field of nano-materials, can solve the problems of difficult removal and impurities with nanoparticles, and achieve the effects of low production cost, controllable shape and good selectivity.

Inactive Publication Date: 2012-06-27
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the methods need to add suitable organic additives, which are not easy to remove, and the obtained Cu 2 O nanoparticles with impurities
[0003] Preparation of Cu Catalyzed by Gold (Au) Nanoparticles Using Thermal Oxidation Reaction 2 O nanocube and Au / Cu 2 The method for O core-shell heterojunction nanocubes has not been reported yet

Method used

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  • Method for preparation of Cu2O and Au/Cu2O core-shell heterostructure nano cube through thermal oxidation
  • Method for preparation of Cu2O and Au/Cu2O core-shell heterostructure nano cube through thermal oxidation
  • Method for preparation of Cu2O and Au/Cu2O core-shell heterostructure nano cube through thermal oxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1, Cu 2 Preparation of O nanocubes

[0022] 1) HAuCl 4 ·3H 2 O and n-tetraoctylammonium bromide (TOAB) were dissolved in deionized water and toluene respectively, stirred evenly, and prepared into 0.03M HAuCl 4 aqueous solution and 0.15M TOAB in toluene.

[0023] 2) Take 6 mL each of the above solutions, and add HAuCl 4 The aqueous solution was added to the toluene solution of TOAB, and stirred at room temperature for 10 minutes, the aqueous solution changed from yellow to colorless, and the toluene solution turned orange.

[0024] 3) Take newly prepared 0.26M NaBH 4 6 mL of aqueous solution was added dropwise to the reaction mixture obtained in step 2) within 30 min, and stirred rapidly for 30 min.

[0025] 4) the organic phase in the mixed solution obtained in step 3) is separated, and the 2 SO 4 The solution was washed once, then washed five times with distilled water, and finally with MgSO 4 The organic phase is dried and filtered through filter pap...

Embodiment 2

[0029] Embodiment 2, Au / Cu 2 Preparation of O core-shell heterojunction nanocubes:

[0030] 1) The preparation of Au nanoparticles is the same as steps 1)-4) in Example 1.

[0031] 2) Disperse the Au nanoparticles coated with TOAB stabilizer obtained in step 1) onto the copper mesh microgrid coated with carbon film, wherein the density of Au nanoparticles on the copper mesh is ≥2500 / μm 2, and then place the microgrid in a holding furnace, heat it up to 100°C at a heating rate of 1°C / s, and hold it for 30min. It was found that the particle size of Au nanoparticles increased from 5.2nm to 6nm, and no other substances were found to be formed.

[0032] 3) The heating temperature in step 2) was raised to 200° C. and kept for 30 minutes. It was found that the particle size of Au nanoparticles increased to 15 nm, and no other substances were found to be formed.

[0033] 4) Raise the heating temperature in step 3) to 300°C and keep it warm for 30 minutes to obtain Au / Cu 2 O core-s...

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Abstract

The invention relates to a method for preparation of a Cu2O and Au/Cu2O core-shell heterostructure nano cube through thermal oxidation. Acccording to the method, a copper mesh micro-gate is used as a copper source, oxygen in the air is used as an oxygen source, Au nanoparticles coated with tetraoctylammonium bromide stabilizers on the surface are used as catalysts and nucleation points for growth of the Cu2O and Au/Cu2O core-shell heterostructure nanoparticles, the raw materials are heated at 300 DEG C, and the Cu2O and Au/Cu2O core-shell heterostructure nano cube can be prepared through adjusting the density of the Au nanoparticles on the copper mesh. The Cu2O nano cube mainly has two forms: a perfect cube and a cube with corners cut. The Au/Cu2O core-shell heterostructure nano cube is a core-shell heterostructure nano cube. The method has the advantages that the product purity and the selectivity are high, the synthesis process is simple, the production cost is low, no pollution can be caused, and the shape can be controlled.

Description

Technical field: [0001] The invention relates to a thermal oxidation reaction for preparing Cu 2 O and Au / Cu 2 The method for O core-shell heterojunction nanocubes can be applied in solar cells, photocatalysis and light-emitting diodes, and belongs to the field of nanomaterials. Background technique: [0002] As the basic materials of nanocomposites, nanoelectronic devices, ultra-high-density magnetic recording systems and optical devices, nanostructured materials have attracted widespread attention for their potential applications. Cuprous oxide (Cu 2 O) is a non-toxic p-type semiconductor material with a band gap of 2.17eV and can be excited by visible light. Due to its low preparation cost and high utilization efficiency, it is widely used in many fields, for example, it is used as a colorant for red glass and red enamel in the glass industry; it is used as a catalyst in the organic industry; it is used in the paint industry Used as an insecticide for ship antifouling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/00B01J13/02B82Y40/00
Inventor 王乙潜梁文双杜庆田
Owner QINGDAO UNIV
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