Method for producing dispersions of nanosheets

Patent metadata

Field	Value
Publication number	US-10309027-B2
Application number	US-201515118665-A
Country	US
Kind code	B2
Filing date	Feb 16, 2015
Priority date	Feb 17, 2014
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

The present invention provides a method for producing a solution of nanosheets, comprising the step of contacting an intercalated layered material with a polar aprotic solvent to produce a solution of nanosheets, wherein the intercalated layered material is prepared from a layered material selected from the group consisting of a transition metal dichalcogenide, a transition metal monochalcogenide, a transition metal trichalcogenide, a transition metal oxide, a metal halide, an oxychalcogenide, an oxypnictide, an oxyhalide of a transition metal, a trioxide, a perovskite, a niobate, a ruthenate, a layered III-VI semiconductor, black phosphorous and a V-VI layered compound. The invention also provides a solution of nanosheets and a plated material formed from nanosheets.

First claim

The invention claimed is:

1. A method for producing a thermodynamically stable solution of nanosheets, comprising the step of contacting an intercalated layered material with a polar aprotic solvent to produce a solution of nanosheets, wherein the intercalated layered material is prepared from a layered material selected from the group consisting of a transition metal dichalcogenide, a transition metal monochalcogenide, a transition metal trichalcogenide, a transition metal oxide, a metal halide, an oxychalcogenide, an oxypnictide, an oxyhalide of a transition metal, a trioxide, a perovskite, a niobate, a ruthenate, a layered III-VI semiconductor, black phosphorous and a V-VI layered compound.

2. The method according to claim 1 , wherein the layered material is selected from the group consisting of a transition metal dichalcogenide, a transition metal monochalcogenide, a transition metal trichalcogenide, a transition metal oxide, a layered III-VI semiconductor, black phosphorous and a V-VI layered compound.

3. The method according to claim 2 , wherein the layered material is selected from the group consisting of a transition metal dichalcogenide, a transition metal monochalcogenide, a transition metal oxide, a layered III-VI semiconductor, black phosphorous and a V-VI layered compound.

4. The method according to claim 1 , wherein the V-VI layered compound is selected from the group consisting of Bi 2 Te 3 and Bi 2 Se 3 .

5. The method according to claim 1 , wherein the layered material is selected from the group consisting of MoS 2 , WS 2 , TiS 2 , NbSe 2 , NbTe 2 , TaS 2 , MoSe 2 , MoTe 2 , WSe 2 , Bi 2 Te 3 , Bi 2 Se 3 , FeSe, GaS, GaSe, GaTe, In 2 Se 3 , TaSe 2 , SnS 2 , SnSe 2 , PbSnS 2 , NiTe 3 , SrRuO 4 , V 2 O 5 , ZrSe 2 , ZrS 3 , HfTe 2 , Sb 2 Te 3 and black phosphorous.

6. The method according to claim 1 , wherein the layered material is selected from the group consisting of MoS 2 , WS 2 , TiS 2 , Bi 2 Te 3 , FeSe, V 2 O 5 , Bi 2 Se 3 , In 2 Se 3 , WSe 2 , MoSe 2 , GaTe, Sb 2 Te 3 and black phosphorous.

7. The method according to claim 1 , wherein the polar aprotic solvent is selected from the group consisting of tetrahydrofuran, dimethyl sulfoxide, ethers, amides, N-methyl pyrrolidone, acetonitrile, CS 2 , N-cyclohexyl-2-pyrrolidone, dimethyl sulfoxide, ammonia, methylamine solvents and mixtures thereof.

8. The method according to claim 1 , wherein the method further comprises the step of preparing the intercalated layered material by contacting a layered material with an electronic liquid to form an intercalated layered material.

9. The method according to claim 8 , wherein the electronic liquid comprises a metal and a solvent.

10. The method according to claim 9 , wherein the solvent is an amine solvent.

11. The method according to claim 9 , wherein the metal is selected from the group consisting of alkali metals and alkaline earth metals.

12. The method according to claim 1 , wherein the nanosheets are unfunctionalised.

13. The method according to claim 1 , wherein the nanosheets comprise four or less stacked monolayers.

14. The method according to claim 1 , wherein the nanosheets have the in-plane crystal structure of the layered material from which they are derived.

15. The method according to claim 1 , wherein the nanosheets substantially have the in-plane dimensions of the layers of the layered material from which they are derived.

16. The method according to claim 1 , wherein the nanosheets are undistorted.

17. The method according to claim 1 , wherein the nanosheets are unfolded.

18. The method according to claim 1 , wherein the intercalated layered material spontaneously dissolves in the polar aprotic solvent to produce the solution of nanosheets.

19. The method according to claim 1 , wherein the method further comprises the step of quenching the nanosheets to form a plated material.

20. The method of claim 19 , wherein the quenching step comprises electrochemically quenching the nanosheets.

21. The method of claim 19 , wherein the quenching step comprises chemically quenching the nanosheets.

22. The method according to claim 19 , wherein the plated material has the in-plane crystal structure of the layered material from which it is derived.

23. The method of claim 1 , wherein the method further comprises the step of functionalising the nanosheets by contacting the nanosheets with RX, wherein R is a hydrocarbon group and X is a suitable leaving group.

24. The method of claim 1 , wherein the method further comprises the step of removing the solvent by freeze drying to produce an aerogel of the nanosheets.

Assignees

• Ucl Business Pcl
• Ucl Business Plc

Inventors

• Cullen Patrick Linden
• Skipper Neal
• Buckley David
• Howard Christopher

Classifications

• C01P2002/08

  Intercalated structures, i.e. with atoms or molecules intercalated in their structure · CPC title

• C01P2002/01

  depicted by a TEM-image · CPC title

• C01P2004/24

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

• C01G35/00

  Compounds of tantalum · CPC title

• C01B25/00

  Phosphorus; Compounds thereof ({C01B6/00} , C01B21/00, C01B23/00 take precedence; perphosphates C01B15/16) · CPC title