Patent ID: 8048785
Filing Date: 2011-11-01
Classification: B82Y,H01L,Y10S

Abstract:
1. A method of forming nanosized filamentary carbon structures, the method comprising: forming a first layer comprising at least one of a metallic and doped semiconductor material having a first work function value; depositing a sacrificial layer comprising a selectively etchable dielectric material having a thickness equivalent to a length of nanosized filamentary carbon structures to be formed, over the first layer; forming a second layer comprising at least one of a metallic and doped semiconductor material having a second work function value different from the first work function value, over the sacrificial layer; patterning the first layer, the sacrificial layer, and the second layer using a lithographic definition technique; selectively chemically etching the sacrificial layer progressively to leave a residual pillar adapted to sustain an overhanging patterned part of the second layer; performing a catalytic chemical vapor deposition to grow the nanosized filamentary carbon structures, wherein growing is initiated from a surface of the first and second layers of a lower contact potential difference and progressing toward a spaced surface of the other the first and second layers of a higher contact potential difference under a directive electric field bias due to a contact potential difference produced by a difference of the first and second work function values.