# US 2017/0282158 A1 · Catalytic Composition for Synthesizing Carbon Nanotubes

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- Number: US 2017/0282158 A1
- Document ID: US20170282158A1
- Status: Published application
- Kind: A1
- Application number: 15/628,049
- Filed: 2017-06-20
- Published: 2017-10-05
- Earliest claimed: 2011-03-18
- Assignees: Nanocyl S.A.
- Inventors: Fang-Yue Chan; Julien Amadou; Cédric De Villepin
- Web page: https://patentgrep.com/patent/US20170282158A1

## CPC

- B01J 23/75: Cobalt
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- C01B 32/158: Carbon nanotubes
- C01B 32/162: characterised by catalysts
- C01B 32/164: involving continuous processes
- H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon
- B01J 21/185: {Carbon nanotubes (carbon nanotubes per se C01B32/15)}
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

The present invention relates to a catalytic composition for the synthesis of carbon nanotubes, comprising an active catalyst and a catalytic support, the active catalyst comprising a mixture of iron and cobalt in any oxidation form and the catalytic support comprising exfoliated vermiculite.

## Claims

### Claim 1

A polymeric composition comprising:
a polymeric matrix; and
carbon nanotubes, wherein the carbon nanotubes are dispersed in the polymer matrix and wherein the carbon nanotubes are obtained by decomposing a gaseous hydrocarbon on a catalytic composition, the catalytic composition comprising:
an active catalyst, comprising a mixture of iron and cobalt in any oxidation form; and
a catalytic support, comprising exfoliated vermiculite;
wherein decomposing a gaseous hydrocarbon on the catalytic composition comprises the following steps:
conditioning the catalytic composition under an inert atmosphere;
contacting the catalytic composition with a gaseous carbon source;
the polymeric composition comprising residues of the catalytic composition.

### Claim 2 (depends on 1)

The polymeric composition according to claim 1, wherein the polymeric matrix comprises polycarbonate.

### Claim 3 (depends on 2)

The polymeric composition according to claim 2, wherein the polymeric composition has a bulk resistivity of less than 10,000 Ω/cm for any composition comprising at least 1 wt % carbon nanotubes.

### Claim 4 (depends on 3)

The polymeric composition according to claim 3, wherein the bulk resistivity is less than 100 Ω/cm for any composition comprising at least 2 wt % carbon nanotubes.

### Claim 5 (depends on 2)

The polymeric composition according to claim 2, comprising 2 wt % carbon nanotubes, wherein the polymeric composition has a bulk resistivity of at least 100 times less than a comparable polymeric composition comprising polycarbonate and carbon nanotubes grown from a catalytic composition of either cobalt and iron on Al2O3 or iron and molybdenum on vermiculite.

### Claim 6 (depends on 1)

The polymeric composition according to claim 1, wherein the polymeric matrix comprises silicone.

### Claim 7 (depends on 6)

The polymeric composition according to claim 6, wherein the polymeric composition has a surface resistivity of less than 105 Ω/cm2 for any composition comprising at least 0.1 wt % carbon nanotubes.

### Claim 8 (depends on 6)

The polymeric composition according to claim 6, wherein the polymeric composition has a bulk resistivity of less than 100 Ω/cm for any composition comprising at least 0.1 wt % carbon nanotubes.

### Claim 9 (depends on 6)

The polymeric composition of claim 6, comprising from 0.1 to 0.25 wt % carbon nanotubes, wherein the polymeric composition has a bulk resistivity of at least 10 times less than a comparable polymeric composition comprising silicone and carbon nanotubes grown from a catalytic composition of cobalt and iron on Al2O3.

### Claim 10 (depends on 6)

The polymeric composition of claim 6, comprising from 0.1 to 0.25 wt % carbon nanotubes, wherein the polymeric composition has a surface resistivity of at least 10 times less than a comparable polymeric composition comprising silicone and carbon nanotubes grown from a catalytic composition of cobalt and iron on Al2O3.

### Claim 11 (depends on 1)

The polymeric composition according to claim 1, wherein the polymeric matrix comprises epoxy.

### Claim 12 (depends on 11)

The polymeric composition according to claim 11, wherein the polymeric composition has a bulk resistivity of less than 100 Ω/cm for any composition comprising at least 0.2 wt % carbon nanotubes.

### Claim 13 (depends on 11)

The polymeric composition according to claim 11, comprising at least 0.2 wt % carbon nanotubes, wherein the polymeric composition has a bulk resistivity of at least about 100 times less than a comparable polymeric composition comprising epoxy and carbon nanotubes grown from a catalytic composition of either cobalt and iron on Al2O3 or iron and molybdenum on vermiculite.