Two-dimensional, ordered, double transition metals carbides having a nominal unit cell composition m′2M″NXN+1

Patent metadata

Field	Value
Publication number	US-12322800-B2
Application number	US-202217713340-A
Country	US
Kind code	B2
Filing date	Apr 5, 2022
Priority date	Apr 20, 2015
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

The present disclosure is directed to compositions comprising at least one layer having first and second surfaces, each layer comprising: a substantially two-dimensional array of crystal cells, each crystal cell having an empirical formula of M′ 2 M″nX n+1 , such that each X is positioned within an octahedral array of M′ and M″; wherein M′ and M″ each comprise different Group 11113, WE, VB, or VIB metals; each X is C, N, or a combination thereof; n=1 or 2; and wherein the M′ atoms are substantially present as two-dimensional outer arrays of atoms within the two-dimensional array of crystal cells; the M″ atoms are substantially present as two-dimensional inner arrays of atoms within the two-dimensional array of crystal cells; and the two dimensional inner arrays of M″ atoms are sandwiched between the two-dimensional outer arrays of M′ atoms within the two-dimensional army of crystal cells.

First claim

What is claimed:

1. A crystalline composition, comprising:
at least one layer having first and second surfaces,
each layer comprising:
a substantially two-dimensional array of crystal cells,
each crystal cell having an empirical formula of M′ 2 M″ n X n+1 , such that each X is positioned within an octahedral array of M′ and M″;
wherein M′ and M″ each comprise different Group IIIB, IVB, VB, or VIB metals;
each X is C, N, or a combination thereof;
n=1 or 2; and wherein
the M′ atoms are substantially present as two-dimensional outer arrays of atoms within the two-dimensional array of crystal cells;
the M″ atoms are substantially present as two-dimensional inner arrays of atoms within the two-dimensional array of crystal cells; and
the two-dimensional inner arrays of M″ atoms are sandwiched between the two-dimensional outer arrays of M′ atoms within the two-dimensional array of crystal cells, and wherein at least one or more of:
(a) n=1 and the layer has a thickness of from about 0.3 to about 0.7 nm,
(b) n=2 and the layer has a thickness of from about 0.6 to about 0.9 nm,
(c) a surface of the layer comprises a coating having a pendant moiety which is linked to the surface by a N, O, or S atom,
(d) the composition exhibits an optical transparency at at least one wavelength in a range of about 250 nm to about 850 nm in a range of from about 0% to at least about 95%,
(e) the composition further comprises a polymer,
(f) the layer has an aspect ratio of from about 1:10 to about 10:1, or
(g) the composition further comprises a cation intercalated therein.

2. The composition of claim 1 , wherein n=1 and the layer has a thickness of from about 0.3 to about 0.7 nm.

3. The composition of claim 1 , wherein n=2 and the layer has a thickness of from about 0.6 to about 0.9 nm.

4. The composition of claim 1 , wherein a surface of the layer comprises a coating having a pendant moiety which is linked to the surface by a N, O, or S atom, and wherein the coating comprises at least one hydroxide, alkoxide, carboxylate, amine, amide, or thiol.

5. The composition of claim 1 , wherein a surface of the layer comprises a coating having a pendant moiety which is linked to the surface by an N, O, or S atom, and wherein the pendant moiety comprises an organic moiety.

6. The composition of claim 5 , wherein the organic moiety is saturated.

7. The composition of claim 5 , wherein the organic moiety is unsaturated.

8. The composition of claim 5 , wherein the organic moiety is aromatic.

9. The composition of claim 1 , wherein the composition comprises a polymer and wherein the polymer comprises a thermoset, a thermoplastic, an elastomer, or any combination thereof.

10. The composition of claim 9 , wherein the polymer comprises an aromatic or heteroaromatic moiety.

11. The composition of claim 1 , wherein the composition comprises a polymer and wherein the polymer comprises polyester, polyamide, polyethylene, polypropylene, polyethylenenaphthalate (PEN), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyether etherketone (PEEK), polyamide, polyaryletherketone (PAEK), polyethersulfone (PES), polyethylenenimine (PEI), poly (p-phenylene sulfide) (PPS), polyvinyl chloride (PVC), a fluorinated or perfluorinated polymer, polyvinylidene difluoride (PVDF), or a polyvinyl fluoride.

12. The composition of claim 1 , wherein the composition comprises a polymer and wherein the polymer is a liquid crystal polymer.

13. The composition of claim 1 , wherein the composite exhibits an optical transparency at at least one wavelength in a range of about 250 nm to about 850 nm in a range of from about 50% to at least about 95%.

14. The composition of claim 1 , wherein the composition further comprises a cation intercalated therein and wherein the cation comprises an alkali metal cation.

15. The composition of claim 14 , wherein the alkali metal comprises lithium.

16. The composition of claim 1 , further comprising an alkaline aqueous medium.

17. The composition of claim 1 , further comprising an acidic aqueous medium.

18. A method, comprising contacting a composition according to claim 1 with a cation and a aqueous medium under conditions sufficient to effect intercalation of the cation into the composition.

19. The method of claim 18 , wherein the aqueous medium is acidic.

20. The method of claim 18 , wherein the aqueous medium is alkaline.

Assignees

• Univ Drexel

Inventors

• Barsoum Michel W
• Anasori Babak
• Gogotsi Yury

Classifications

• C30B29/68

  Crystals with laminate structure, e.g. "superlattices" · CPC title

• C30B7/02

  by evaporation of the solvent · CPC title

• C30B29/38

  Nitrides · CPC title

• C30B29/60

  characterised by shape · CPC title

• C01B21/0602

  with two or more other elements chosen from metals, silicon or boron · CPC title