Field Electron Emission from Caterpillar-Like Clavae Nano-Structure Carbon Thin Films

Nano-carbon films with large density of caterpillar-like clavae are synthesized by microwave plasma-assisted chemical vapor deposition using a mixture of methane and hydrogen gases on Mo film substrates. The films are characterized by Raman spectra, optical microscopy and field emission scanning ele...

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Bibliographic Details
Published in:Chinese physics letters 2010-08, Vol.27 (8), p.222-224
Main Author: 王丽军 朱玉传 王小平 章诗 刘欣欣 李怀辉 梅翠玉 刘晓菲
Format: Article
Language:English
Subjects:
Current density
Density
Electric fields
Electron emission
Emission
Nanocomposites
Nanomaterials
Nanostructure
Thin films
光学显微镜
卡特彼勒
场发射扫描电子显微镜
场致电子发射
电流密度
碳薄膜
等离子体辅助
纳米结构
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Summary:Nano-carbon films with large density of caterpillar-like clavae are synthesized by microwave plasma-assisted chemical vapor deposition using a mixture of methane and hydrogen gases on Mo film substrates. The films are characterized by Raman spectra, optical microscopy and field emission scanning electron microscopy. Field electron emission measurements of nano-carbon films are also carried out to show the turn-on field as low as 1.5 V/μm and the high current density of 2.2mA/cm^2 at electric field of 5.TV/μm, the uniformly distributed emission site density from a broad well-proportioned emission area of about 4.0cm^2 is also obtained. The field- emission current density J versus macroscopic electric field E does not follow the original Fowler-Nordheim （F-N） relation since they are not well represented in the F-N plot by a straight line. A modified F-N relation is applied successfully to explain all the field-emission data observed for E 〈 6.0 V/μm.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/27/8/087901