Carbon substance and method for manufacturing the same, electron emission element and composite materials

• Main Authors: ITOH SHIGEO, FUJIMURA YOUHEI, TAKIKAWA HIROFUMI
• Format: Patent
• Language: English
• Published: 19.08.2004
• Edition: 7
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; BASIC ELECTRIC ELEMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY; INORGANIC CHEMISTRY; MANUFACTURE OR TREATMENT THEREOF; METALLURGY; NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS,MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES ASDISCRETE UNITS; NANOTECHNOLOGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; SPINNING; TEXTILES; TRANSPORTING

A carbon substance comprises a structure and line-shaped bodies, the structure having a size ranging from about 1 mum to about 100 mum and including carbon and a metal or a metallic oxide, and the line-shaped bodies having diameters smaller than about 200 nm and including carbon as a main component thereof and growing radially from a surface of the structure. A method for manufacturing the carbon substance uses a thermal decomposition of a source gas containing carbon in the vicinity of a catalyst, wherein the catalyst comprises a first and a second materials, the first material being Ni or a Ni oxide and the second material being In or an In oxide; and the thermal decomposition is performed at a temperature ranging from about 675° C. to about 750° C. An electron emission element uses the carbon substance as an electron emission material. A composite material includes the carbon substance in its matrix.