# US 8,784,765 B2 · C70 cube with enhanced photoluminescence and method for preparing the same

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- Number: US 8,784,765 B2
- Document ID: US8784765B2
- Status: Granted
- Kind: B2
- Application number: 13/284,388
- Filed: 2011-10-28
- Published: 2012-08-16
- Granted: 2014-07-22
- Earliest claimed: 2011-02-14
- Assignees: Postech Academy-Industry Foundation
- Applicants: Hee Cheul Choi; Chi Beom Park
- Inventors: Hee Cheul Choi; Chi Beom Park
- Web page: https://patentgrep.com/patent/US8784765B2

## CPC

- C01B 32/152: Fullerenes
- B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- Y10S 977/735: Carbon buckyball
- Y10T 428/2982: Particulate matter [e.g., sphere, flake, etc.]
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed in that a fullerene aggregate and a method for preparing the same, and the fullerene aggregate including a cube-shaped crystalline C70 non-solvent aggregate.

## Claims

### Claim 1

A cube-shaped C70 fullerene aggregate comprising:
a plurality of C70 molecules aggregated in the shape of a cube, wherein the cube-shaped C70 fullerene aggregate is crystalline and is a non-solvent aggregate.

### Claim 2 (depends on 1)

The fullerene aggregate of claim 1, wherein the C70 non-solvent aggregate includes C70 molecules forming a cubic crystal structure.

### Claim 3 (depends on 2)

The fullerene aggregate of claim 2, wherein the cubic crystal structure is a face centered cubic system.

### Claim 4

A fullerene aggregate comprising:
a cube-shaped crystalline C70.2mesitylene aggregate.

### Claim 5 (depends on 4)

The fullerene aggregate of claim 4, wherein the C70.2mesitylene aggregate includes C70 molecules form a cubic crystal structure.

### Claim 6 (depends on 5)

The fullerene aggregate of claim 5, wherein the cubic crystal structure is a simple cubic system.

### Claim 7 (depends on 5)

The fullerene aggregate of claim 5, wherein the cubic crystal has a lattice constant of about 10.48 Å at about 90K or about 10.59 Å at 300K.

### Claim 8 (depends on 4)

The fullerene aggregate of claim 4, wherein the length of the longest side of the C70.2mesitylene aggregate is about 0.1 μm to about 100 μm.

### Claim 9

A method for preparing a C70 aggregate comprising:
(a) adding a poor solvent selected from isopropanol, methanol, ethanol, acetone, propanol, butanol, acetonitrile, and hexane, or a mixed solvent thereof, to a mesitylene solution of C70 to prepare a mixed dispersion, wherein the poor solvent is slowly added below or equal to a rate where an interface distinguishing the mesitylene layer and the poor solvent layer is maintained in the mixed dispersion; and
(b) allowing the mixed dispersion to stand so that a C70 aggregate may be precipitated.

### Claim 10 (depends on 9)

The method of claim 9, wherein the interface of the step (a) distinguishes a colored mesitylene layer and a colorless transparent poor solvent layer.

### Claim 11 (depends on 9)

The method of claim 9, wherein in the (a) step, the concentration of the mesitylene solution of the C70 before adding the poor solvent is about 0.1 mg C70/mL to about 0.4 mg C70/mL.

### Claim 12 (depends on 9)

The method of claim 9, further comprising after the step (b),
(b′) shaking the mixed dispersion or treating it by sonication.

### Claim 13 (depends on 9)

The method of claim 9, wherein the poor solvent is added to the mesitylene solution of C70 to get a volume ratio of mesitylene solution to poor solvent of about 1:1 to about 1:6.

### Claim 14 (depends on 9)

The method of claim 9, wherein the C70 aggregate includes a cube-shaped crystalline C70.2mesitylene aggregate having a cubic crystal structure.

### Claim 15 (depends on 14)

The method of claim 14, wherein a part of the cube-shaped crystalline C70.2mesitylene aggregate includes a dent on at least one side of the cube.

### Claim 16 (depends on 15)

The method of claim 15, wherein the dent is located in the center of the cube side.

### Claim 17

A method for preparing a C70 aggregate comprising:
(a) adding a poor solvent selected from isopropanol, methanol, ethanol, acetone, propanol, butanol, acetonitrile, and hexane, or a mixed solvent thereof, to a mesitylene solution of C70 to prepare a mixed dispersion, wherein the mixed solution is sonicated simultaneously with or immediately after adding the poor solvent; and
(b) allowing the mixed dispersion to stand so that a C70 aggregate may be precipitated.

### Claim 18 (depends on 17)

The method of claim 17, wherein the poor solvent of the step (a) is added at a rate where an interface distinguishing a poor solvent layer and a mesitylene layer is not maintained at least in the mixed dispersion.

### Claim 19 (depends on 17)

The method of claim 17, wherein in the step (a), the concentration of the mesitylene solution of C70 before adding the poor solvent is about 0.1 mg C70/mL to about 0.4 mg C70/mL.

### Claim 20 (depends on 17)

The method of claim 17, wherein the poor solvent is added to the mesitylene solution of C70 to get a volume ratio of mesitylene solution to poor solvent of about 1:1 to about 1:6.

### Claim 21 (depends on 17)

The method of claim 17, wherein the C70 aggregate includes a cube-shaped crystalline C70.2mesitylene aggregate.

### Claim 22 (depends on 21)

The method of claim 21, wherein a part of the cube-shaped crystalline C70.2mesitylene aggregate includes a dent on at least one side of the cube.

### Claim 23 (depends on 22)

The method of claim 22, wherein the dent is located in the center of the cube side.

### Claim 24

A method for preparing a cube-shaped crystalline C70 non-solvent aggregate, comprising:
(a) preparing a C70 aggregate including a cube-shaped crystalline C70.2mesitylene aggregate; and
(b) treating the C70 aggregate by thermal annealing under a reducing or inert atmosphere.