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Preparation and field emission characteristics of carbon nano-composite materials

Author: ChenTao
Tutor: ZengZuoQing
School: University of Electronic Science and Technology
Course: Condensed Matter Physics
Keywords: field emission graphene carbon nanotubes composite
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 118
Quote: 0
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Abstract


Cathode is one of the core components of vacuum microelectronic devices. Vacuum microelectronic devices to the development of small brings out more and more demand, such as miniaturization, fast response, long life and so on. The new requirement of development on cathode leads rapid development of field emission cold cathode. The focus of cold cathode is new types of cold cathode materials developed and the structure of the cold cathode improved. By the theory of multistage effect, the carbon nano-composite material field emission cold cathode is researched.The structure model of two stage effect is brought out. Carbon nanotube/polyurethane foam field emission cold cathode, field enhancement factor of 2.5×104 and operating electric field of 1.4 V/μm, is prepared. Large area field emission cold cathode is easy prepared by carbon nanotube/polyurethane foam that is simple process, low cost and CNT protected by polyurethane. It could be used in large area field emission display.Preparation of graphene composite field emission cold cathode to achieve graphene in the composite structure of the quasi-two-dimensional distribution is our plan. Preparation of composites requires large amounts of grapheme, so amounts of graphene oxide are prepared by intercalation oxide technology. Amounts of graphene powder are prepared by microwave heating through amounts of graphene oxide. Graphene/ultra-high molecular weight polyethylene and graphene/PLA composite field emission cold cathode are prepared. The graphene/PLA field emission characteristics under electric field induced is researched.

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