METHOD FOR SELECTIVELY PRODUCING CARBON NANOSTRUCTURE

• Main Authors: KAJIURA HISASHI, KO KOKIN, ATA MASAFUMI
• Format: Patent
• Language: English
• Published: 02.12.2004
• Edition: 7
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a method for producing a carbon nanostructure by using a chemical vapor deposition process. SOLUTION: A carbon source and a mixture catalyst are used, wherein the mixture catalyst includes at least one element selected from a group A including Fe, Co and Ni, and at least one supporting element selected from a group B including lanthanoid elements. The lanthanoid elements function to lower the melting point of the catalyst by forming alloys, so that the carbon nanostructures can be grown at lower temperatures. Further, the lanthanoid elements also enhance catalyst activity of Ni, Co or Fe by changing the catalyst surface electronic properties. Also, the lanthanoid elements also scavenger excess carbon so that carbon nanostructures can be grown without contamination. COPYRIGHT: (C)2005,JPO&NCIPI