Nanocarbon aggregate and method for manufacturing the same
AssigneeNEC Corporation
InventorsRyota Yuge, Masako Yudasaka, Sumio Iijima
Life of this patent
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Abstract
A nanocarbon aggregate including a graphite aggregate including a graphene sheet having a petal shape and a nanohorn. The petal-shaped graphite aggregate achieves a reduction in the particulate size and a higher dispersibility by allowing the edge of the petal shape to locally absorb a metal, a metal complex and a metal oxide. The nanocarbon aggregate is used for a catalyst support.
Claims31
A nanocarbon aggregate comprising:
- a graphite aggregate including one or a plurality of graphene sheets and having a petal shape as a whole;
- and
- a plurality of nanohorns supported on said petal-shaped graphite aggregate.
A method for manufacturing a nanocarbon aggregate including a petal-shaped graphite aggregate and a nanohorn by CO2 laser ablation, said method comprising:
- controlling, in the CO2 laser ablation, a scanning rate of a laser that scans a surface of a graphite target, intensity of the laser, and species and pressure of an ambient gas, to thereby control a content ratio of the petal-shaped graphite aggregate to the nanohorn, wherein a laser power density is changed between 10 and 50 kW/cm2.
A method for manufacturing a nanocarbon aggregate including a petal-shaped graphite aggregate and a nanohorn by CO2 laser ablation, said method comprising:
- performing an oxidation treatment on the nanocarbon aggregate obtained after the CO2 laser ablation, to thereby control a content ratio of the petal-shaped graphite aggregate to the nanohorn, wherein a laser power density is changed between 10 and 50 kW/cm2.
A method for manufacturing a nanocarbon aggregate including a petal-shaped aggregate and a nanohorn by CO2 laser ablation, said method comprising:
- controlling, in the CO2 laser ablation, a scanning rate of a laser that scans a surface of a graphite target, intensity of the laser, and species and pressure of an ambient gas, to thereby control a content ratio of the petal-shaped graphite aggregate to the nanohorn, wherein
- a laser power density is changed between 10 and 50 kW/cm2, and
- a rotational speed of the target is controlled between 0.5 rpm and 6 rpm, the petal-containing carbon nanohorn includes one to ten layers of a graphene sheet and has an agglomerated structure of 30 to 200 nm, and the nanohorn has a diameter of 2 to 5 nm.
A method for manufacturing a nanocarbon aggregate including a petal-shaped aggregate and a nanohorn by CO2 laser ablation, said method comprising:
- performing an oxidation treatment on the nanocarbon aggregate obtained after the CO2 laser ablation, to thereby control a content ratio of the petal-shaped graphite aggregate to the nanohorn, wherein
- a laser power density is changed between 10 and 50 kW/cm2, and
- a rotational speed of a target is controlled between 0.5 rpm and 6 rpm, the petal-containing carbon nanohorn includes one to ten layers of a graphene sheet and has an agglomerated structure of 30 to 200 nm, and the nanohorn has a diameter of 2 to 5 nm.
Dependencies are inferred from the claim text.