Method for preparing graphene-tin oxide nanocomposite, and graphene-tin oxide nanocomposite

Patent metadata

Field	Value
Publication number	US-11499933-B2
Application number	US-201816613395-A
Country	US
Kind code	B2
Filing date	May 17, 2018
Priority date	May 24, 2017
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

A method of manufacturing a graphene-tin oxide nanocomposite comprises dispersing graphene and tin oxide in an organic solvent to prepare a dispersion solution, drying the dispersion solution to obtain a powdery mixture, and irradiating the mixture with microwaves to obtain a graphene-tin oxide nanocomposite. Irradiation of graphene and tin oxide with microwaves results in the simplification of the manufacturing process of graphene-tin oxide nanocomposites and a decrease in manufacturing time and cost, and produce graphene-tin oxide nanocomposites at low temperatures. Further, the graphene-tin oxide nanocomposite with improved sensitivity to NO2 gas may be produced.

First claim

The invention claimed is:

1. A method of manufacturing a graphene-tin oxide nanocomposite, the method comprising:
dispersing graphene and tin oxide in an organic solvent to prepare a dispersion solution;
drying the dispersion solution to obtain a powdery mixture; and
irradiating the powdery mixture with microwaves to obtain the graphene-tin oxide nanocomposite,
wherein the graphene-tin oxide nanocomposite comprises a primary particle having a size of several hundreds of nm of tin oxide and a secondary particle having a size of 1 nm to 20 nm of tin oxide.

2. The method of claim 1 , wherein the graphene and the tin oxide are in a powder form.

3. The method of claim 1 , wherein a solid content ratio of the graphene and the tin oxide ranges from 0.1:99.9 to 5:95.

4. The method of claim 1 , wherein the microwave is irradiated at an output of 500 W to 2000 W.

5. The method of claim 1 , wherein the microwave is irradiated for 1 minute to 10 minutes.

6. The method of claim 1 , wherein the organic solvent includes an alcohol-based solvent.

7. The nanocomposite of claim 1 , wherein a tin atom is inserted at an interstitial site.

8. A gas sensor including a graphene-tin oxide nanocomposite, comprising:
a substrate;
a gas sensing layer disposed on the substrate and comprising a graphene-tin oxide nanocomposite having a solid content ratio of the graphene and the tin oxide ranges from 0.1:99.9 to 5:95, wherein the graphene-tin oxide nanocomposite has a tin atom inserted at an interstitial site; and
a conductive electrode disposed on one of on the substrate and the gas sensing layer,
wherein the graphene-tin oxide nanocomposite comprises a primary particle having a size of several hundreds of nm of tin oxide and a secondary particle having a size of 1 nm to 20 nm of tin oxide.

9. The gas sensor of claim 8 , wherein the conductive electrode has an interdigitated shape.

10. The gas sensor of claim 8 , wherein the gas sensing layer further comprises at least one metal oxide.

11. The gas sensor of claim 10 , wherein the at least one metal oxide is selected from the group consisting of tungsten oxide (WO3), tin oxide (SnO 2 ), niobium oxide (Nb2O5), zinc oxide (ZnO), indium oxide (In2O3), iron oxide (Fe2O3), titanium oxide (TiO2), cobalt oxide (Co2O3) and gallium oxide (Ga2O3).

12. The gas sensor of claim 8 , wherein the graphene-tin oxide nanocomposite comprises a primary particle of tin oxide and a secondary particle of tin oxide.

13. A method of manufacturing a graphene-tin oxide nanocomposite, the method comprising:
dispersing graphene powder and tin oxide powder in a first organic solvent to prepare a dispersion solution;
drying the dispersion solution to obtain a powdery mixture;
irradiating the powdery mixture with microwaves to obtain the graphene-tin oxide nanocomposite;
dispersing the graphene-tin oxide nanocomposite in a second organic solvent; and
coating the dispersed nanocomposite solution on a substrate,
wherein the graphene-tin oxide nanocomposite comprises a primary particle having a size of several hundreds of nm of tin oxide and a secondary particle having a size of 1 nm to 20 nm of tin oxide.

14. The method of claim 13 , wherein a solid content ratio of the graphene and the tin oxide ranges from 0.1:99.9 to 5:95.

15. The method of claim 13 , wherein the microwave is irradiated at an output of 500 W to 2000 W.

16. The method of claim 13 , wherein the microwave is irradiated for 1 minute to 10 minutes.

17. The method of claim 13 , wherein the organic solvent includes an alcohol-based solvent.

Assignees

• Lg Display Co Ltd
• Univ Hanyang Ind Univ Coop Found

Inventors

• Ryu Sung Pil
• Chang Ki Seok
• Kim Wook Sung
• Kang Han Saem
• Kim Hyoun Woo
• Kwon Yong Jung
• Choi Myong Sik
• Kang Sung Yong
• Bang Jae Hoon

Classifications

• C01P2004/03

  obtained by SEM · CPC title

• C01B32/184 Primary

  Preparation · CPC title

• C01G19/02

  Oxides · CPC title

• C01B32/194

  After-treatment · CPC title

• B01J19/126 Primary

  Microwaves · CPC title