Compositions comprising enhanced graphene oxide structures and related methods

Patent metadata

Field	Value
Publication number	US-9527741-B2
Application number	US-201414270276-A
Country	US
Kind code	B2
Filing date	May 5, 2014
Priority date	May 3, 2013
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

Embodiments described herein generally relate to compositions comprising a graphene oxide species. In some embodiments, the compositions advantageously have relatively high oxygen content, even after annealing.

First claim

What is claimed is:

1. A method, comprising:
heating a first composition comprising a first graphene oxide species at a temperature of about 150° C. for a period of at least 1 day in the absence of a chemical reagent capable of reacting with the first graphene oxide species, thereby producing a second composition comprising a second graphene oxide species different from the first graphene oxide species, wherein the second graphene oxide species has an atomic % of oxygen of at least about 20 at %.

2. A method as in claim 1 , wherein the first graphene oxide species comprises oxygen-containing groups attached to the first graphene oxide species and dispersed over a surface of the first graphene oxide species.

3. A method as in claim 2 , wherein the heating step causes at least some of the oxygen-containing groups to rearrange and/or migrate to a different location on the surface of the graphene oxide species.

4. A method as in claim 1 , wherein the atomic % of oxygen in the second graphene oxide species is at least about 50% of the atomic % of oxygen in the first graphene oxide species.

5. A method as in claim 1 , wherein the second composition comprises:
a first set of domains comprising carbon atoms substituted with oxygen-containing groups; and
a second set of domains comprising carbon atoms that are substantially free of oxygen-containing groups.

6. A method as in claim 5 , wherein the atomic % of oxygen in the first set of domains is about 40% or greater.

7. A method as in claim 1 , wherein the chemical reagent is a reducing agent and/or a strong base.

8. A method as in claim 1 , wherein the heating step is performed at a temperature of about 120° C. or less.

9. A method as in claim 1 , wherein the heating step is performed for a period of at least about 4 days.

10. A method as in claim 1 , wherein the heating step is performed at atmospheric pressure and/or at a pH of about 7.

11. A method as in claim 1 , wherein the first and second compositions are in substantially solid form.

12. A method as in claim 1 , wherein the first and second compositions further comprise a fluid carrier, wherein the fluid carrier is a non-aqueous solution, an aqueous solution, or water.

13. A method as in claim 1 , wherein the atomic % of oxygen in the second graphene oxide species is at least about 25 at %.

14. A method as in claim 2 , wherein the oxygen-containing groups comprise epoxy groups, carboxyl groups, carbonyl groups, lactol groups, and/or hydroxyl groups.

15. A method as in claim 1 , wherein the second graphene oxide species absorbs at least about 20% more photons in the visible range than the first graphene oxide species, when placed under essentially identical conditions.

16. A method as in claim 1 , wherein the second graphene oxide species exhibits a sheet resistance of about 1×10 9 ohms/sq or less.

17. A method as in claim 1 , wherein the first graphene oxide species exhibits a first peak emission wavelength and the second graphene oxide species exhibits a second peak emission wavelength, wherein the second peak emission wavelength is at least about 50 nm less than the first peak emission wavelength.

18. A method as in claim 1 , wherein the second graphene oxide species exhibits a peak emission wavelength of about 500 nm or less.

19. A method as in claim 1 , wherein the second graphene oxide species has a band gap of about 5 eV or less.

20. A method as in claim 1 , wherein the second graphene oxide species is arranged in a device and/or in contact with one or more electrodes.

21. A method as in claim 1 , wherein the heating step is performed at a temperature of about 100° C. or less.

22. A method as in claim 1 , wherein the heating step is performed at a temperature of about 80° C. or less.

23. A method, comprising:
heating a first composition comprising a first graphene oxide species at a temperature of about 150° C. or less for a period of at least about 1 day, thereby producing a second composition comprising a second graphene oxide species, wherein the atomic % of oxygen in the second graphene oxide species is at least about 50% of the atomic % of oxygen in the first graphene oxide species.

Assignees

• Massachusetts Inst Technology

Inventors

• Kumar Priyank Vijaya
• Bardhan Neelkanth M
• Belcher Angela
• Grossman Jeffrey

Classifications

• C01B31/043 Primary

  Chemistry & Metallurgy · mapped topic

• C01B32/23 Primary

  Oxidation · CPC title