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

Patent metadata

Field	Value
Publication number	US-2020166469-A1
Application number	US-201816613395-A
Country	US
Kind code	A1
Filing date	May 17, 2018
Priority date	May 24, 2017
Publication date	May 28, 2020
Grant date	—

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

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.

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 method of claim 1 , further comprising:
dispersing the graphene-tin oxide nanocomposite in an organic solvent; and coating the dispersed nanocomposite solution on a substrate.

8 . (canceled)

9 . The nanocomposite of claim 1 , wherein the graphene-tin oxide nanocomposite comprises a primary particle of tin oxide and a secondary particle of tin oxide.

10 . The nanocomposite of claim 9 , wherein a tin atom is inserted at an interstitial site.

11 . A gas sensor including the 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.

12 . The gas sensor of claim 11 , wherein the conductive electrode has an interdigitated shape.

13 . The gas sensor of claim 11 , wherein the gas sensing layer further comprises at least one metal oxide.

14 . The gas sensor of claim 13 , wherein the at least one metal oxide is selected from the group consisting of tungsten oxide (WO3), tin oxide (SnO2), niobium oxide (Nb2O5), zinc oxide (ZnO), indium oxide (In2O3), iron oxide (Fe2O3), titanium oxide (TiO2), cobalt oxide (Co2O3) and gallium oxide (Ga2O3).

15 . The gas sensor of claim 11 , wherein the graphene-tin oxide nanocomposite comprises a primary particle of tin oxide and a secondary particle of tin oxide.

16 . A method of manufacturing a graphene-tin oxide nanocomposite, the method comprising:
dispersing graphene power and tin oxide power in an 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 an organic solvent; and coating the dispersed nanocomposite solution on a substrate.

17 . The method of claim 16 , wherein a solid content ratio of the graphene and the tin oxide ranges from 0.1:99.9 to 5:95.

18 . The method of claim 16 , wherein the microwave is irradiated at an output of 500 W to 2000 W.

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

20 . The method of claim 16 , wherein the organic solvent includes an alcohol-based solvent.

21 . The nanocomposite of claim 16 , wherein the graphene-tin oxide nanocomposite comprises a primary particle of tin oxide and a secondary particle of tin oxide.

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

• C01B2204/00

  Structure or properties of graphene · CPC title

• G01N27/12

  of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid {, for detecting components in the fluid} · CPC title

• C01B32/184 Primary

  Preparation · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• C01G19/02

  Oxides · CPC title