ISSN 1002-1027　　CN 11-2952/G2

### Synthesis and Field Emission Study of Large-Scaled Aligned Carbon Nanotube Films

GE Song1, FENG Sunqi1, YU Dapeng1, ZHANG Guangyu2, LIU Shuang2

1. 1State Key Laboratory for Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing, 100871；2State Key Laboratory for Surfaces Physics, Institute of Physics, Chinese Academy of Science, Beijing, 100080
• Received:2002-05-06 Online:2003-05-20 Published:2003-05-20

Abstract: Large-scaled highly oriented carbon nanotube films on Si substrate with Ni as a catalyst were synthesized by hot-filament-enhanced CVD and field-emission properties of the films were studied. It has been discovered that there is a knee-point Es on Fowler-Nordheim curves of the nanotube films, the slope of F-N curve in the low field region is much higher than that in the high field region. The field-enhancement factor β is proportional to the distance d between the anode and the cathode, and Es is an inverse measure of the distance d. Both of them can be phenomenally interpreted by the two-region field-emission model. The possible mechanisms for the saturation of emitter current on high field region have been discussed.