Products having sheets of 2d materials and related inks for direct ink writing

Patent metadata

Field	Value
Publication number	US-2020339827-A1
Application number	US-201916771636-A
Country	US
Kind code	A1
Filing date	Jan 18, 2019
Priority date	Jan 19, 2018
Publication date	Oct 29, 2020
Grant date	—

Abstract

In one inventive concept, an ink includes a precursor of a graphene analogue, a thickener, and a solvent. In another inventive concept, an ink includes a graphene analogue, a thickener, and a solvent. In yet another inventive concept, an aerogel includes a three-dimensional printed structure having printed features comprised of two dimensional sheets of a graphene analogue.

First claim

What is claimed is:

1 . An ink, comprising:
a precursor of a graphene analogue; a thickener; and a solvent.

2 . An ink as recited in claim 1 , wherein the precursor of the graphene analogue includes precursor of a transition metal dichalcogenide.

3 . An ink as recited in claim 1 , wherein the precursor of the graphene analogue includes graphene oxide.

4 . An ink as recited in claim 3 , wherein the graphene oxide is comprised of single layer sheets having an average lateral dimension in a range of about 200 nm to about 800 nm.

5 . An ink as recited in claim 1 , comprising a second graphene analogue.

6 . An ink as recited in claim 5 , wherein the graphene analogue includes a transition metal dichalcogenide.

7 . An ink as recited in claim 5 , wherein the graphene analogue includes a boron nitride.

8 . An ink as recited in claim 1 , wherein the precursor of the graphene analogue is a composition comprising a graphene oxide and a precursor of a transition metal dichalcogenide.

9 . An ink as recited in claim 1 , wherein a concentration of the precursor of the graphene analogue is about 1 wt % to about 60 wt % of total ink.

10 . An ink as recited in claim 1 , wherein the thickener is a thixotropic agent.

11 . An ink as recited in claim 1 , wherein the thickener is selected from the group consisting of: a surfactant, a cellulose derivative, and a carbon black material.

12 . An ink as recited in claim 11 , wherein the thickener includes the cellulose derivative, wherein a concentration of the cellulose derivative is in a range of about 1 wt % to about 5 wt % of total ink.

13 . An ink as recited in claim 11 , wherein the thickener includes the carbon black material, wherein a concentration of the carbon black material is in a range of about 5 wt % to about 20 wt % of total ink.

14 . An ink as recited in claim 13 , comprising a gelling agent.

15 . An ink, comprising:
a graphene analogue; a thickener; and a solvent.

16 . An ink as recited in claim 15 , wherein the graphene analogue is selected from the group consisting of: a transition metal dichalcogenide, boron nitride, and graphene.

17 . An aerogel, comprising:
a three-dimensional printed structure having printed features comprised of two dimensional sheets of a graphene analogue.

18 . An aerogel, as recited in claim 17 , wherein the sheets each have two perpendicular dimensions, an average of each dimension being at least 50 nm.

19 . An aerogel as recited in claim 17 , wherein an average thickness of the sheets is less than about 5 nm.

20 . An aerogel as recited in claim 17 , wherein the graphene analogue includes graphene.

21 . An aerogel as recited in claim 17 , wherein the graphene analogue includes a transition metal dichalcogenide.

22 . An aerogel as recited in claim 17 , wherein the graphene analogue includes a transition metal dichalcogenide and graphene.

23 . An aerogel as recited in claim 17 , wherein the graphene analogue includes boron nitride.

24 . An aerogel as recited in claim 17 , wherein the graphene analogue includes boron nitride and graphene.

25 . An aerogel as recited in claim 17 , wherein the graphene analogue includes boron nitride and a transition metal dichalcogenide.

26 . An aerogel as recited in claim 17 , wherein the printed features have substantially zero contaminants.

27 . An aerogel as recited in claim 17 , wherein the aerogel is electrically conductive.

28 . An aerogel as recited in claim 17 , wherein the aerogel has a surface area greater than 50 meter squared per gram.

29 . A method for forming the aerogel of claim 17 , the method comprising:
obtaining an ink having the graphene analogue and/or a precursor of a graphene analogue, a thickener, and a solvent; forming a three-dimensional structure by direct ink writing using the ink; drying the formed three-dimensional structure; and thermal annealing the dried three-dimensional structure.

30 . A method as recited in claim 29 , wherein the ink comprises a gelling agent, wherein the method further comprises, before drying the formed three-dimensional structure, heating the three-dimensional structure for gelation of the three-dimensional structure; and exchanging the solvent.

Assignees

• L Livermore Nat Security Llc

Inventors

• Chandrasekaran Swetha
• Worsley Marcus A

Classifications

• C01G39/06 Primary

  Sulfides · CPC title

• C09D1/00 Primary

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• C01B2204/02

  Single layer graphene · CPC title

• C01P2004/20

  extending in two dimensions, e.g. plate-like · CPC title

• C01B2204/22

  Electronic properties · CPC title