Multilayered graphene and methods of making the same

Patent metadata

Field	Value
Publication number	US-2019074142-A1
Application number	US-201816122996-A
Country	US
Kind code	A1
Filing date	Sep 6, 2018
Priority date	Sep 6, 2017
Publication date	Mar 7, 2019
Grant date	—

Abstract

The present invention relates in part to a method of fabricating graphene structures from graphene oxide by reducing the graphene oxide on a patterned substrate. The invention also relates in part to graphene structures produced using said method and electrodes and capacitors comprising said graphene structures.

First claim

We claim:

1 . A method of fabricating graphene, the method comprising:
providing a patterned substrate; depositing graphene oxide on the patterned substrate; and reducing the graphene oxide to graphene.

2 . The method of claim 1 , wherein the patterned substrate comprises polyethylene terephthalate (PET).

3 . The method of claim 1 , wherein the patterned substrate has structures and the distance between the structures is between 50 nm and 500 nm.

4 . The method of claim 1 , wherein the patterned substrate has structures between 50 nm and 500 nm in width.

5 . The method of claim 1 , wherein the patterned substrate has structures between 50 nm and 500 nm in height.

6 . The method of claim 1 , wherein the patterned substrate has structures between 1 μm and 3 μm in width.

7 . The method of claim 1 , wherein the patterned substrate has structures between 1.0 μm and 3 μm in height.

8 . The method of claim 1 , wherein the patterned substrate has structures and the distance between the structures is between 1 μm and 3 μm.

9 . The method of claim 1 , further comprising the step of ultrasonicating the graphene oxide prior to deposition.

10 . The method of claim 1 , wherein the step of depositing graphene oxide comprises a technique selected from the group containing spin coating, drop casting, pad printing, doctor blading, casting, screen printing, ink-jet printing, roll coating, and brush coating.

11 . The method of claim 1 , wherein the step of reducing the graphene oxide to graphene comprises treating the graphene oxide with a high intensity light.

12 . The method of claim 11 , wherein the high intensity light is generated with a xenon flash.

13 . A graphene structure produced using the method of claim 1 .

14 . The graphene structure of claim 13 ;
wherein the graphene structure comprises multiple layers; and the average distance between layers is greater than 1.6 μm;

15 . The graphene structure of claim 13 ;
wherein the graphene structure comprises carbon and oxygen; and the oxygen content of the graphene structure is less than 25 at. %.

16 . An electrode comprising the graphene structure of claim 13 .

17 . The electrode of claim 16 , wherein the specific capacitance of the electrode is greater than 300 F g −1 .

18 . A capacitor comprising at least one electrode of claim 16 .

19 . A sandwich-style capacitor comprising at least one electrode of claim 16 .

20 . The electrode of claim 16 , wherein the energy density of the electrode is greater than 0.300 W·h·cm −3 and wherein the power density of the electrode is greater than 300 W·cm −3 .

Assignees

• Gartia Manas Ranjan
• Chaichi Ardalan
• Univ Louisiana State

Inventors

• Gartia Manas Ranjan
• Chaichi Ardalan

Classifications

• H01G11/36 Primary

  Nanostructures, e.g. nanofibres, nanotubes or fullerenes · CPC title

• H01G11/32

  Carbon-based · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• B05D3/06

  by exposure to radiation (B05D3/02 takes precedence {; plasma treatment B05D3/141}) · CPC title

• C01B2204/30

  Purity · CPC title