Method for preparing sea urchin-shaped zinc oxide nanowire

Patent metadata

Field	Value
Publication number	US-11685665-B2
Application number	US-202117396611-A
Country	US
Kind code	B2
Filing date	Aug 6, 2021
Priority date	Sep 16, 2020
Publication date	Jun 27, 2023
Grant date	Jun 27, 2023

Abstract

According to an embodiment, a method for preparing a sea urchin-shaped zinc oxide (ZnO) nanowire comprises preparing a mixture of a ZnO nano-powder and a graphite powder and irradiating the mixture, in a container, with a microwave.

First claim

What is claimed is:

1. A method for preparing a sea urchin-shaped zinc oxide (ZnO) nanowire, the method comprising:
preparing a mixture of a ZnO nano-powder and a graphite powder; and
irradiating the mixture, in a container, with a microwave.

2. The method of claim 1 , wherein the graphite powder is an expanded graphite powder.

3. The method of claim 2 , wherein the expanded graphite powder is an expanded graphite powder sieved using a screen of 70 mesh to 90 mesh.

4. The method of claim 1 , wherein the container is an alumina crucible.

5. The method for claim 1 , wherein 1 part by weight to 20 parts by weight of the graphite powder are mixed with 100 parts by weight of the ZnO nano-powder.

6. The method of claim 1 , further comprising, after preparing the mixture, ball-milling the mixture.

7. The method of claim 6 , wherein the ball-milling is performed for 10 minutes to 60 minutes.

8. The method of claim of claim 1 , wherein irradiating the mixture in the container with the microwave is repeated five times to 20 times, for 10 seconds to 60 seconds for each time.

9. The method of claim 8 , further comprising stirring the mixture between the times of irradiating the mixture in the container with the microwave.

10. The method of claim 1 , further comprising generating carbon oxide gas from the graphite powder in the mixture by energy of the microwave.

11. The method of claim 10 , wherein the container includes a lid, and the method further comprises:
increasing an internal pressure of the container up to 1 atmosphere to 5 atmospheres by the carbon oxide gas; and
randomly creating ZnO nuclei and the ZnO nanowires from the ZnO nano-powder in the mixture by opening the lid of the container with the increased internal pressure to thus reduce the internal pressure to atmospheric pressure.

12. The method of claim 1 , further comprising creating a spark from the graphite powder in the mixture by energy of the microwave.

13. The method of claim 12 , further comprising:
turning a whole or part of the ZnO nano-powder in the mixture into a dynamic state by the spark; and
randomly creating ZnO nuclei and the ZnO nanowires from the ZnO nano-powder in the dynamic state.

14. The method of claim 1 , further comprising generating carbon oxide gas and zinc (Zn) gas from the mixture by energy of the microwave.

15. The method of claim 14 , further comprising randomly creating ZnO nuclei and the ZnO nanowires from the Zn gas.

Assignees

• Univ Yonsei Iacf

Inventors

• Lee Kyu Hyoung
• Jin Changhyun
• Choi Myung Sik

Classifications

• B01J19/126 Primary

  Microwaves · CPC title

• B01J19/0053

  Details of the reactor · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• C01P2004/16

  Nanowires or nanorods, i.e. solid nanofibres with two nearly equal dimensions between 1-100 nanometer · CPC title

• C01G9/03 Primary

  Processes of production using dry methods, e.g. vapour phase processes · CPC title