# US 11,305,999 B2 · Graphene nanoribbon precursor and method for producing graphene nanoribbon

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- Number: US 11,305,999 B2
- Document ID: US11305999B2
- Status: Granted
- Kind: B2
- Application number: 16/812,424
- Filed: 2020-03-09
- Published: 2020-10-01
- Granted: 2022-04-19
- Earliest claimed: 2019-03-28
- Assignees: Fujitsu Limited
- Applicants: Fujitsu Limited
- Inventors: Manabu Ohtomo; Shintaro Sato
- Web page: https://patentgrep.com/patent/US11305999B2

## CPC

- C01B 32/15: Nano-sized carbon materials
- C01B 32/184: Preparation
- C07C 25/22: with condensed rings
- C08G 61/10: only aromatic carbon atoms, e.g. polyphenylenes
- C01B 2204/06: Graphene nanoribbons
- C08G 2261/146: Side-chains containing halogens
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A graphene nanoribbon precursor having a structural formula represented by a following chemical formula (1), wherein in the following chemical formula (1): n is an integer greater than or equal to 0; X is bromine, iodine or chlorine; and Y is hydrogen or fluorine.

## Claims

### Claim 1

A graphene nanoribbon precursor having a structural formula represented by a following chemical formula (1), wherein the following chemical formula (1) has a first case where n is 0; X is bromine, iodine or chlorine; and Y is fluorine and a second case where n is an integer greater than or equal to 1; X is bromine, iodine or chlorine; and Y is hydrogen or fluorine.

### Claim 2 (depends on 1)

The graphene nanoribbon precursor according to claim 1, wherein n is an integer greater than or equal to 0 and less than or equal to 5.

### Claim 3

A method of producing a graphene nanoribbon, the method comprising:
heating a graphene nanoribbon precursor to a first temperature on a substrate to induce elimination of X and a C—C binding reaction to obtain a polymer on the substrate; and
heating the polymer to a second temperature that is higher than the first temperature to induce elimination of H and Y and a C—C binding reaction,
the graphene nanoribbon precursor having a structural formula represented by a following chemical formula (1), wherein in the following chemical formula (1) has a first case where n is 0; X is bromine, iodine or chlorine; and Y is fluorine and a second case where n is an integer greater than or equal to 1; X is bromine, iodine or chlorine; and Y is hydrogen or fluorine.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the C—C binding reaction is induced by an Ullmann reaction caused by eliminating the X atoms from the graphene nanoribbon precursors.

### Claim 5 (depends on 3)

The method according to claim 3, wherein the polymer is a polymer in which aromatic compounds are connected and in which a plurality of molecules of the graphene nanoribbon precursors are arranged in one direction while reversing the direction of protrusion.