Rare earth element MXenes and methods of making thereof

Patent metadata

Field	Value
Publication number	US-12322799-B2
Application number	US-202117497003-A
Country	US
Kind code	B2
Filing date	Oct 8, 2021
Priority date	Oct 9, 2020
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

A composition of matter defined by the general formula of M2+vL1−vX2, wherein: X is carbon; M represents a transition metal selected from the group consisting of Ti, Ta, Sc, Cr, Zr, Mo, V, and Nb; and L represents a lanthanide element selected from the group consisting of Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.

First claim

What is claimed is:

1. A composition of matter selected from Mo 2 NdC 2 and Mo 2.5 Nd 0.5 C 2 .

2. The composition of claim 1 , wherein the composition is produced by at least:
preparing precursor MAX phase powder;
etching the MAX phase powder to obtain multi-layered MXene powder; and
delaminating the multi-layered MXene powder to obtain single-to-few-layered MXene flakes comprising the composition of matter.

3. The composition of claim 2 , wherein preparing precursor MAX phase powder includes mixing and reactive sintering elemental powders of Mo and Nd with Al in a stoichiometric ratio of Mo:Nd:Al:C of 2.5:0.5:1.1:2 to obtain one or more sintered MAX phase blocks.

4. The composition of claim 3 , wherein preparing precursor MAX phase powder further includes milling the one or more sintered MAX phase blocks to obtain the MAX phase powder.

5. The composition of claim 2 , wherein etching the MAX phase powder includes adding the MAX phase powder into an aqueous hydrofluoric acid to selectively etch away Al to obtain multi-layered MXene powder.

6. The composition of claim 2 , wherein delaminating the multi-layered MXene powder includes delaminating the multi-layered MXene powder using tetramethylammonium hydroxide (TMAOH).

7. The composition of claim 6 , wherein delaminating the multi-layered MXene powder further includes filtering MXene from TMAOH to obtain the single-to-few-layered MXene flakes.

8. A method of producing a composition of matter selected from Mo 2 NdC 2 and Mo 2.5 Nd 0.5 C 2 , the method comprising:
preparing precursor MAX phase powder;
etching the MAX phase powder to obtain multi-layered MXene powder; and
delaminating the multi-layered MXene powder to obtain single-to-few-layered MXene flakes comprising the composition of matter.

9. The method of claim 8 , wherein preparing precursor MAX phase powder includes mixing and reactive sintering elemental powders of Mo and Nd with Al in a stoichiometric ratio of Mo:Nd:Al:C of 2.5:0.5:1.1:2 to obtain one or more sintered MAX phase blocks.

10. The method of claim 9 , wherein preparing precursor MAX phase powder further includes milling the one or more sintered MAX phase blocks to obtain the MAX phase powder.

11. The method of claim 8 , wherein etching the MAX phase powder includes adding the MAX phase powder into an aqueous hydrofluoric acid to selectively etch away Al to obtain multi-layered MXene powder.

12. The method of claim 8 , wherein delaminating the multi-layered MXene powder includes delaminating the multi-layered MXene powder using tetramethylammonium hydroxide (TMAOH).

Assignees

• Univ Indiana Trustees

Inventors

• Anasori Babak
• Hong Weichen

Classifications

• C22C1/051

  Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor · CPC title

• C22C2202/02

  Magnetic · CPC title

• C22C29/02

  based on carbides or carbonitrides · CPC title

• C22C1/06 Primary

  with the use of special agents for refining or deoxidising · CPC title

• C01P2002/77

  by unit-cell parameters, atom positions or structure diagrams · CPC title