Production member and production apparatus for carbon nanohorn aggregate

Patent metadata

Field	Value
Publication number	US-11208329-B2
Application number	US-201716637511-A
Country	US
Kind code	B2
Filing date	Aug 10, 2017
Priority date	Aug 10, 2017
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

In order to provide a means for industrially producing a fibrous carbon nanohorn aggregate (CNB), a production member is used which is a combination of a plurality of carbon targets containing a metal catalyst selected from Fe, Ni, Co or a single substance or a mixture of these two or three substances capable of generating carbon nanohorn aggregates including the fibrous carbon nanohorn aggregate by laser irradiation, and a target fixing jig for fixing the carbon target, wherein the target fixing jig has a plurality of grooves for fixing the target to a plate-shaped member, the carbon target has a thickness of a height equal to or greater than the top surface of the fixing jig from the groove, and the width of the carbon target is larger than the size of the spot of the laser beam in the width direction.

First claim

The invention claimed is:

1. A production member comprising a combination of a plurality of carbon targets containing a metal catalyst selected from a single substance of Fe, Ni, Co or a mixture of two or three kinds thereof, which can generate carbon nanohorn aggregates including a fibrous carbon nanohorn aggregate by irradiation of a laser beam, and a target fixing jig for fixing the plurality of the carbon targets,
wherein the target fixing jig has a plurality of grooves for fixing the target to a plate-shaped member,
the carbon target has a thickness of a height equal to or greater than the upper surface of the fixing jig from the groove, and
the width of the carbon target is larger than the size of the spot of the laser beam in the width direction.

2. The production member according to claim 1 , wherein the target fixing jig comprises one selected from metals selected from copper, aluminum, tungsten, molybdenum, and chromium, alloys including these metals, ceramics, diamond, or composites with the metals or alloys.

3. The production member according to claim 1 , wherein a spot diameter of the laser beam is 0.5 mm to 5 mm, a width of a groove of the fixing jig is 1 mm to 20.5 mm, and a thickness of the target is 1 mm to 20 mm.

4. The production member according to claim 3 , wherein an interval between the grooves of the fixing jig is in the range of 1 to 10 mm.

5. The production member according to claim 1 , wherein the shape of the target is any one of a quadrangular prism structure, a semi-cylindrical semi-prism structure, and a cylindrical structure that engages with the groove of the fixing jig.

6. The production member according to claim 1 , wherein the catalyst is Fe.

7. A method for producing carbon nanohorn aggregates including a fibrous carbon nanohorn aggregate using the production member according to claim 1 , the method comprising:
disposing the production member in a production chamber in which a non-oxidizing atmosphere can be maintained,
introducing a gas which maintains the non-oxidizing atmosphere in the production chamber,
continuously irradiating the carbon target fixed to the groove of the fixing jig with a line of laser beam, and then continuously irradiating the carbon target not irradiated with the laser beam fixed to the adjacent groove with a line of laser beam, and
collecting a product produced by the irradiation of the laser beam by the flow of the gas.

8. The method according to claim 7 , wherein the production member is arranged by at an angle with respect to the irradiation direction of the laser beam so that the laser beam does not hit a plume generated from the carbon target.

9. A production apparatus of carbon nanohorn aggregates including a fibrous carbon nanohorn aggregate, the apparatus comprising:
a production chamber in which the production member according to claim 1 is movably mounted and in which the inside can be maintained in a non-oxidizing atmosphere;
an irradiation unit irradiating laser beam to the carbon target in the production chamber;
a movement unit moving the production member in the extending direction of the groove and moving the irradiation position of laser beam to an adjacent groove when irradiation of laser beam to the carbon target in one groove is completed; and
collecting unit collecting carbon nanohorn aggregates including the fibrous carbon nanohorn aggregate generated by irradiating the carbon target with laser beam.

Assignees

• Nec Corp

Inventors

• Yuge Ryota

Classifications

• B01J23/745 Primary

  Iron · CPC title

• C04B35/52

  based on carbon, e.g. graphite · CPC title

• C23C14/00

  Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• C01B32/18 Primary

  Nanoonions; Nanoscrolls; Nanohorns; Nanocones; Nanowalls · CPC title