Ultra-hard carbon film from epitaxial two-layer graphene

Patent metadata

Field	Value
Publication number	US-2021404091-A1
Application number	US-201816757306-A
Country	US
Kind code	A1
Filing date	Oct 22, 2018
Priority date	Oct 20, 2017
Publication date	Dec 30, 2021
Grant date	—

Abstract

An ultra-hard carbon film is formed by the uniaxial compression of thin films of graphene. The graphene films are two or three layers thick (2-L or 3-L). High pressure compression forms a diamond-like film and provides improved properties to the coated substrates.

First claim

What is claimed is:

1 . A composition of matter comprising:
a silicon carbide substrate having a surface; an ultra-hard carbon film disposed on the surface, wherein the ultra-hard carbon film is between 4 Å and 10 Å thick and has a hardness greater than 100 GPa.

2 . The composition of matter as recited in claim 1 , wherein the ultra-hard carbon film is between 4 Å and 7 Å thick.

3 . The composition of matter as recited in claim 1 , wherein the ultra-hard carbon film is between 4 Å and 6 Å thick.

4 . The composition of matter as recited in claim 1 , wherein the ultra-hard carbon film is optically transparent.

5 . The composition of matter as recited in claim 1 , wherein the composition of matter coats a protective armor.

6 . The composition of matter as recited in claim 5 , wherein the protective armor is a protective vest.

7 . The composition of matter as recited in claim 5 , wherein the protective armor is a protective helmet.

8 . The composition of matter as recited in claim 1 , wherein the ultra-hard carbon film was formed by uniaxially compressing a graphene film to the surface of the silicon carbide with a pressure between 1 GPa and 10 GPa, wherein the graphene film had a thickness between 4 Å and 10 Å.

9 . The composition of matter as recited in claim 8 , wherein the graphene film consists of two layers (2-L) of graphene.

10 . The composition of matter as recited in claim 9 , wherein the two-layers (2-L) of graphene consist of a buffer layer of graphene that is contiguous with a monolayer of graphene, wherein the buffer layer of graphene is contiguous with the surface of the silicon carbide.

11 . The composition of matter as recited in claim 9 , wherein the ultra-hard carbon film has a Young's modulus greater than 0.3 TPa.

12 . The composition of matter as recited in claim 9 , wherein the ultra-hard carbon film has a Young's modulus greater than 1 TPa.

13 . A method for producing an ultra-hard carbon film, the method comprising:
uniaxially compressing a graphene film to a surface of silicon carbide with a pressure between 1 GPa and 10 GPa, wherein the graphene film has a thickness between 4 Å and 10 Å and consists of two layers (2-L) or three layers (3-L) of graphene, thereby forming an ultra-hard carbon film with a thickness between 4 Å and 10 Å and a hardness greater than 100 GPa.

14 . The method as recited in claim 13 , wherein the graphene film consists of two layers (2-L) of graphene.

15 . The method as recited in claim 13 , wherein the ultra-hard carbon film is optically transparent.

16 . The method as recited in claim 13 , wherein the compressing applies a force between 30 nanonewtons and 900 nanonewtons.

17 . The method as recited in claim 13 , wherein the graphene film has a thickness between 4 Å and 6 Å.

18 . The method as recited in claim 13 , wherein the compressing transforms the graphene film such that the graphene film increases in hardness by at least 75 GPa to produce the hardness greater than 100 GPa.

Assignees

• Univ City New York Res Found
• Univ New York

Inventors

• Gao Yang
• Cao tengfei
• Cellini Filippo
• Riedo Elisa
• Bongiorno Angelo

Classifications

• F41H5/04 Primary

  composed of more than one layer {(outerwear resistant to mechanical aggressions A41D31/24; layered products B32B; shaping reinforced articles B29C67/00)} · CPC title

• C01B2204/26

  Mechanical properties · CPC title

• C30B23/025

  characterised by the substrate · CPC title

• A42B3/04

  Parts, details or accessories of helmets · CPC title

• C01B32/194

  After-treatment · CPC title