Products having sheets of 2D materials and related inks for direct ink writing
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.
1. An ink, comprising:
a precursor of a graphene analogue, wherein the precursor includes a graphene oxide in the form of single layer sheets;
a thickener;
a gelling agent; and
a solvent.
2. An ink as recited in claim 1 , wherein the precursor of the graphene analogue includes a 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—single layer sheets have 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 1 , wherein the gelling agent includes an ammonium carbonate solution.
15. An ink, comprising:
a graphene analogue;
a thickener comprising a cellulose derivative; and
a solvent, wherein the ink is configured to be extruded through a nozzle for forming a three-dimensional structure via deposition of a plurality of layers of the ink in sequence.
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 ink as recited in claim 11 , wherein the ink includes a combination of thickeners.
18. An ink as recited in claim 1 , wherein the ink is a co-gel suspension.
19. An ink as recited in claim 15 , wherein the ink includes a combination of thickeners.
20. An ink as recited in claim 15 , wherein the ink includes a co-gel suspension of graphene analogue@graphene oxide.
21. A method of forming an aerogel using the ink of claim 1 , the method comprising:
obtaining the ink
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.
22. A method as recited in claim 21 , the method further comprising:
before drying the formed three-dimensional structure, heating the three-dimensional structure for gelation of the three-dimensional structure; and
exchanging the solvent.
23. A method as recited in claim 21 , wherein forming the ink includes extruding the ink through a nozzle for forming a ligament that is about equal to a diameter of the nozzle, wherein the ink is configured such that the ligament formed therefore has sufficient viscosity to enable formation of the three-dimensional structure via deposition of a plurality of layers of the ink in sequence.
24. An ink as recited in claim 1 , wherein the thickener is a combination of a cellulose derivative and a carbon black material.
25. An ink as recited in claim 24 , wherein the cellulose derivative and a the carbon black material are present in an effective amount to cause the ink to have sufficient viscosity to enable extrusion of the ink through a nozzle for forming a ligament about equal to the diameter of the nozzle.
26. An ink as recited in claim 15 , wherein the ink is configured to be extruded through the nozzle for forming a ligament that is about equal to a diameter of the nozzle, wherein the ink is configured such that the ligament formed therefore has sufficient viscosity to enable formation of a three-dimensional structure via deposition of the plurality of layers of the ink in sequence.
27. An ink as recited in claim 15 , wherein the thickener is present in an effective amount to cause the ink to have sufficient viscosity to enable extrusion of the ink through the nozzle for forming a ligament about equal to the diameter of the nozzle.
28. An ink as recited in claim 15 , wherein the thickener includes a carbon black material.
29. An ink, comprising:
a precursor of a graphene analogue, wherein the precursor is a combination comprising a graphene oxide and a precursor of a second graphene analogue different than the graphene oxide, wherein the graphene oxide in the form of single layer sheets;
a thickener;
a gelling agent; and
a solvent.