研究目的
Investigating the stability and reliability of an electrical device employing highly crystalline single-walled carbon nanotubes as a field emitter.
研究成果
The application of highly crystalline SWCNTs as electron emission source was successfully achieved to obtain a planar light-emission device with low power consumption. Highly crystalline SWCNTs are an electrical element that can make a significant improvement in FE characteristics. A thin cathodic electrode film assembled via a wet process employing a highly crystalline SWCNT is expected to provide energy conservation as an FE electron emission source.
研究不足
The crystallinity of the dispersed highly crystalline SWCNTs deteriorates with repeated milling and at higher operation pressures. This is likely owing to a difference in atom binding energy and cohesion energy depending on the higher-order structure of SWCNTs.
1：Experimental Design and Method Selection:
The study involved the synthesis of highly crystalline SWCNTs by arc discharge and their structural characterization, followed by the construction of a thin film including highly crystalline SWCNTs for field emission. A wet-coating process was adopted to fabricate a cathode with stable FE at a low driving voltage using SWCNTs.
2：Sample Selection and Data Sources:
Commercial arc-SWCNTs were used and annealed at a high temperature in a high vacuum to obtain highly crystalline SWCNTs.
3：List of Experimental Equipment and Materials:
TEM (HR-3000, Hitachi High-Technologies Corporation, Japan), Raman spectrum measurement by the blue laser beam at a 473 nm wavelength, and various chemicals including butyl acetate, ethyl cellulose, and sodium linear-alkyl-benzenesulfonate.
4：Experimental Procedures and Operational Workflow:
The mixture with the ITO solvent, highly crystalline SWCNTs, and the dispersant was agitated by an ultra-sonic homogenizer. The agitated mixture was sprayed onto a metal-coated glass substrate heated to around 400 K, and the coated film was sintered at 900 K in a vacuum.
5：Data Analysis Methods:
The field emission properties were measured with a phosphor anode plate on a sputtered ITO pattern film and 1.0 millimeter glass plate as a spacer.
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