2d materials

Patent metadata

Field	Value
Publication number	US-2018258117-A1
Application number	US-201615760554-A
Country	US
Kind code	A1
Filing date	Sep 15, 2016
Priority date	Sep 16, 2015
Publication date	Sep 13, 2018
Grant date	—

Abstract

The synthesis of 2D metal chalcogenide nanosheets and metal-ion or metalloid-ion doped 2D metal chalcogenide nanosheets by adding a metal complex to a hot dispersing medium. The mean lateral dimension of the nanosheets may be controlled by appropriate temperature selection.

First claim

1 . A method for the synthesis of 2D metal chalcogenide nanosheets, the method comprising adding a metal complex to a dispersing medium which is at elevated temperature, wherein the metal complex comprises a metal ion and a ligand comprising at least two atoms selected from oxygen, sulfur, selenium, and tellurium, to form a dispersion of the 2D metal chalcogenide nanosheets in the dispersing medium.

2 . A method for the synthesis of metal-ion or metalloid-ion doped 2D metal chalcogenide nanosheets, the method comprising adding a metal complex to a dispersing medium which is at elevated temperature, wherein the reaction is performed in the presence of a salt of said metal or metalloid ion, and wherein the complex comprises a metal ion and a ligand comprising at least two atoms selected from oxygen, sulfur, selenium and tellurium, to form a dispersion of the 2D metal chalcogenide nanosheets in the dispersing medium.

3 . The method of claim 1 , wherein the ligand comprises at least two atoms selected from sulfur and selenium.

4 . The method of claim 1 , wherein the metal complex comprises a transition metal ion, optionally wherein the metal complex comprises a molybdenum or tungsten ion.

5 . The method of claim 1 , wherein the method is a method for the synthesis of metal-ion doped 2D metal chalcogenide nanosheets, optionally wherein the metal ion is selected from manganese, iron, cobalt, nickel, copper, and zinc.

6 . The method of claim 1 , wherein the salt of said metal or metalloid ion is a halide, optionally wherein the salt is a chloride.

7 . The method of claim 1 , wherein the ligand is a chalcogenocarbamate or chalcogenocarbonate ion, optionally wherein the ligand is a dithiol-carbamate or a dithiol-carbonate or a diseleno-carbamate or diseleno-carbonate.

8 . The method of claim 1 , wherein the complex is a complex of formula (IV):

wherein
each E is O, S, or Se,
each X is S or Se,
each Z is OR 1 or NR 2 R 3 ;
R 1 , R 2 , and R 3 are independently selected from optionally substituted alkyl, alkyenyl, cycloalkyl, cyclocalkyl-C 1-6 alkyl, cycloalkenyl, cycloalkenyl-C 1-6 alkyl, heterocyclyl, heterocyclyl-C 1-6 alkyl, aryl, aryl-C 1-6 alkyl, and heteroaryl-C 1-6 alkyl.

9 . The method of claim 1 , wherein the dispersing medium comprises at least one coordinating group selected from an amino group, a hydroxyl group, a carboxylic acid group, a phosphonic acid group, a phosphine group, and a phosphine oxide group.

10 . The method of claim 1 , wherein the 2D material is a binary 2D material.

11 . The method of claim 1 , wherein the nanosheets have a mean lateral dimension of from 4 to 10 nm with a size distribution no more than ±20% of the mean lateral dimension, preferably no more than ±15%.

12 . The method of claim 1 , the method further comprising a step of thermally annealing the nanosheets at a temperature of 350° C. or higher.

13 . A composition comprising 2D metal chalcogenide nanosheets, wherein the variation in lateral dimension of the nanosheets is less than ±20%, preferably less than ±15%.

14 . The composition of claim 13 , wherein the 2D metal chalcogenide is MoS 2 .

15 . The composition of claim 13 , wherein the nanosheets have a mean lateral dimension of about 5 nm or wherein the nanosheets have a mean lateral dimension of about 7 nm or wherein the nanosheets have a mean lateral dimension of about 9 nm or wherein the nanosheets have a mean lateral dimension of about 11 nm.

16 . A capacitor comprising nanosheets according to claim 13 , wherein the nanosheets are provided as a composite with graphene.

Assignees

• Univ Manchester

Inventors

• O'Brien Paul
• Savjani Nicky
• Brent John (Jack) R

Classifications

• C01P2002/82

  by IR- or Raman-data · CPC title

• C07F11/005 Primary

  compounds without a metal-carbon linkage · CPC title

• C01P2004/24

  Nanoplates, i.e. plate-like particles with a thickness from 1-100 nanometer · CPC title

• C01P2002/88

  by thermal analysis data, e.g. TGA, DTA, DSC · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title