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7.2: Carbon Nanotubes Synthesized at Low Temperature and a Novel Self‐Focusing Gated Field Emission Device
Author(s) -
Hsu YuYing,
Lin KaoChao,
Chen HsiaWei,
Juan ChuanPing,
Cheng HuangChung
Publication year - 2008
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3069742
Subject(s) - carbon nanotube , materials science , field electron emission , ethylene , hydrogen , catalysis , thermal , volumetric flow rate , nanotechnology , carbon fibers , chemical engineering , electron , composite material , chemistry , thermodynamics , organic chemistry , quantum mechanics , composite number , engineering , physics
A method for synthesis of CNTs at low temperature using thermal CVD is proposed. A multi‐layered catalyst, Co/Ti/Al, has been successfully utilized to synthesize carbon nanotubes at 500°C by thermal CVD via modifying the flow rate of reaction gases. The flow rates of ethylene, hydrogen, and nitrogen are determined to be 125, 10, and 1000 sccm to improve the growth and field emission characteristics of CNTs at low temperature. Moreover, a novel self‐focusing gated device was proposed to resolve the problem of electron beam divergence.