Method for manufacturing of metal oxide nanoparticles and metal oxide nanoparticles thereby

Patent metadata

Field	Value
Publication number	US-10193133-B2
Application number	US-201514685864-A
Country	US
Kind code	B2
Filing date	Apr 14, 2015
Priority date	Apr 17, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

The present invention relates to a method for preparing metal oxide nanoparticles and metal oxide nanoparticles prepared thereby. The method includes: dipping a cathode and an anode formed of a metal for forming oxide, in an inorganic electrolyte solution containing halogen salt, and applying voltage to the anode and the cathode to form, on the anode, metal oxide forming an anode surface. According to a method of the present invention, disadvantages of typical nanoparticle synthesizing methods may be solved to cheaply and rapidly manufacture nanoparticles having various structures through a single process without using a surfactant. In practicing a method of the invention, metal oxide nanoparticles may be rapidly formed, nanoparticles having excellent crystallinity may be produced, and factors of the anodizing method, such as voltage, temperature, an electrolyte, and an electrolyte concentration may be changed to simply adjust a shape of the nanoparticles.

First claim

What is claimed is:

1. A method for preparing metal oxide nanoparticles, the method comprising:
dipping a cathode and an anode, each of the cathode and the anode being a different metal, in an inorganic electrolyte solution containing a halogen salt (step 1); and
applying a DC voltage between the anode and the cathode so as to oxidize the metal of the anode, to form, on the anode, a metal oxide forming an anode surface (step 2), whereby the metal oxide formed is an oxide of the metal of the anode,
wherein the anode is formed of at least one selected from the group consisting of indium, tin, zinc, zirconium, aluminum, titanium, nickel, iron and copper, and
wherein the cathode is formed of platinum.

2. The method of claim 1 , wherein a surfactant is not used.

3. The method of claim 1 , wherein the anode of step 1 has a wire shape or a sheet shape.

4. The method of claim 1 , wherein the halogen salt of the step 1 is NaCl, KCl or a mixture thereof.

5. The method of claim 1 , wherein the inorganic electrolyte solution of step 1 has a concentration of 0.2 M to 3.5 M.

6. The method of claim 1 , wherein the voltage of the step 2 is applied in a range of 5 V to 30 V.

7. The method of claim 1 , wherein the step 2 is performed in a temperature range of 0° C. to 100° C.

8. The method of claim 1 , further comprising ultrasonic-treating, washing and drying the anode prior to performing the step 1.

9. The method of claim 8 , wherein the ultrasonic-treating is performed in at least one solvent selected from the group consisting of acetone, isopropyl, alcohol and methanol.

10. The method of claim 1 , further comprising washing, ultrasonic-treating, centrifuging, and firing the prepared metal oxide particles after performing the step 2.

11. The method of claim 10 , wherein the firing is performed in a temperature range of 300° C. to 600° C.

12. The method of claim 1 , further comprising
adjusting the DC voltage applied to the anode and the cathode to adjust the size of the metal oxide nanoparticles deposited on the anode.

Assignees

• Korea Advanced Inst Sci & Tech
• Korea Advanced Inst Of Science And Technlogy

Inventors

• Cho Sung Oh
• Ghafar Ali
• Park Yang Jeong

Classifications

• B01J23/72

  Copper · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• C01G53/04

  Oxides · CPC title

• C01G51/00

  Compounds of cobalt · CPC title

• B01J23/75

  Cobalt · CPC title