Stratified carbon film for large current emission synthesized by a local heating CVD method and its growth mechanism

In order to fulfill the requirements of large current field emission, a kind of stratified carbon film has been synthesized by local heating chemical vapor deposition method. In this stratified structure, carbon fibers with the diameter of more than 500nm have been formed and intertwined with each other as conductive net; carbon nanotubes with the diameter about less than 30nm can be synthesized around the fibers as the field emitters. From the scanning electron microscopy pictures, we can see that the main growth process of carbon fiber is top-down mode, while carbon nanotubes were synthesized on the body of carbon fiber with defect growth mechanism. Field emission tests show that this kind of structure with low turn-on field and large current emission ability.