Carbon nanoballoon structure and method for preparation thereof, and electron emitter
US7754177B2 · kind B2 · utility
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2Claims
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Key dates
| Filing date | Mar 25, 2005 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | May 17, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2201/30469
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
A hollow carbon nanoballoon structure having a relatively large closed space, and a method of producing a carbon nanoballoon structure capable of easily and stably producing such a structure. The carbon nanoballoon structure is obtained by heating soot prepared by an arc discharge using carbon electrodes, soot prepared by vaporizing carbon by laser irradiation, or carbon black having a specific surface area of 1000 m2/g or more and a primary particle diameter of 20 nm or more at a high temperature in an inert gas atmosphere, and includes graphite sheets linked to form a curved surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.