多壁碳纳米管薄膜的制备及其场发射性能研究
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摘要
碳纳米管(Carbon Nanotube, CNT)是继C60之后碳材料领域的重大发现,是由一层或多层石墨片卷曲而成的同心中空管,因其奇特的结构和物理、化学性能,引起各界广大的关注,被认为是最有理论研究和应用价值的纳米材料。CNT的比表面积大,机械强度高,化学性质稳定,轴向良好的导电性利于电子运输,纳米尺度的尖端和管壁的缺陷都形成良好的电子发射端,因而CNT作为场发射阴极材料,具有开启电压低,发射电流密度高等优点,是继金刚石、硅等材料之后最有潜力的场发射阴极材料。本文首先介绍了CNT的发现、结构、基本性质和制备方法,并介绍了在此基础上的CNT的应用,其中着重介绍了CNT作为场发射显示器(Field Emission Display, FED)阴极材料的应用研究,对用直接生长法和移植法制备的CNT阴极FED器件的制作方法做了详尽阐述,并对其场发射光学特性和电学特性进行了系统的研究,最后指出目前CNT阴极FED器件存在的主要问题及其相关性能改进的可行方法,使后续工作的进行成为可能。
第一章绪论
本章主要回顾了CNT的发现过程,简要地介绍了CNT的结构特征、类别、性能特征。并基于CNT的性能特征,详尽地介绍了CNT在储能方面、复合材料领域、生物医学工程、场发射领域的应用。其中场发射领域的应用将作为本文的研究重点。
第二章碳纳米管制备以及相应的场发射显示器阴极薄膜制作
本章详尽地介绍了CNT的化学气相沉积法、电弧放电法和激光蒸发法三种制备方法。其中着重介绍了化学气相沉积法制备CNT的相关工艺,包括了该方法所使用的催化剂的制备,并重点阐述了基于化学气相沉积法制备CNT来制作场发射阴极薄膜的工艺。
第三章多壁碳纳米管薄膜场发射应用研究
本章主要介绍了两种用化学气相沉积法制备的CNT作为阴极材料制作的FED器件。本文采用丝网印刷法和直接生长法制备的CNT薄膜作为场发射阴极,制作成二极型结构的显示器件后测试其场发射性能。实验表明用直接生长法制备的CNT薄膜阴极具有较低的开启电压和较高的场发射电流密度,场发射性能优异。但丝网印刷法制备的CNT薄膜阴极也有一定的优势,如成本低、工艺成熟、适合大面积生产等。本文在研究了两种CNT薄膜阴极的制备方法和场发射性能研究的基础上,提出了CNT阴极FED目前存在的问题及对未来的展望。
As a great discovery after C60 in the field of carbon materials,carbon nanotube is a concentric hollow tube which is curled by one graphite sheet or more. Because of peculiar structure, physical and chemical properties,carbon nanotube has attracted much attention in variety of fields and is considered to be the nanomaterial which has most theoretical research and application value. Carbon nanotube has high surface area, high mechanical strength, chemical stability and excellent electrical conductivity in the axial to transmit electrons. Nano-scale points and defects in walls form good electron transmitting terminal. Among field emission cathode materials.carbon nanotube has low turn-on voltage and high field emission current density and so on. Consequently carbon nanotube becomes the most potential field emission cathode materials instead of diamond and Si. At the beginning,this paper describes carbon nanotubes' discovery, structure, basic properties, preparation and related applications, specifically introduces the application in field emission cathode materials in detail. Then direct growth on substrate method and transplantation method are studied to fabricate field emission cathode. Meanwhile.the deep research into optical characteristics and electrical characteristics are carried out. Finally, lots of deficiencies and some possible measures to improve field emission property have been related which will be the focus of future work.
ChapterⅠIntroduction
In this chapter, the discovery of carbon nanotubes is reviewed. Then the structure characteristics, categories and performance characteristics of carbon nanotubes are briefly introduced. Base on these,some applications of carbon nanotubes are investigated in detail, including storage energy, nano-composite materials, biomedicine engineering and field emission materials. Then this text especially focuses on the field emission application.
Chapter II Preparations of Carbon Nanotubes and Related Production of Thin Film Field Emission Cathode
In this chapter, the technologies and conditions for the growth of carbon nanotubes are discussed for different methods, which include the chemical vapor deposition method, the arc discharge method and the laser ablation method. In this text we mainly focuses on carbon nanotubes'preparation using chemical vapor deposition method and the preparation of the catalyst. Then based on this, this chapter investigates the production process of the thin film field emission cathode further.
Chapter III The Research of Carbon Nanotube Field Emission Film
This chapter presents two types of field emission display device whose cathode materialls are carbon nanotube films prepared by chemical vapor deposition method. We test the field emission properties of the two types of device using diode structures whose cathode films are produced by direct growth on substrate method and screen-printing process respectively. Experimental results show that, the field emission cathode film grown on substrate has lower turn-on voltage and higher brightness so that it is considered as excellent field emission cathode. Meanwhile. the field emission cathode film produced by screen-printing process has its own advantages.such as lower cost, mature technology,easy to obtain large area manufacture. Finally based the research above,we analyze the problems which the carbon nanotubes cathodes of field emission display still have, and make some prospects in these aspects.
第一章绪论
本章主要回顾了CNT的发现过程,简要地介绍了CNT的结构特征、类别、性能特征。并基于CNT的性能特征,详尽地介绍了CNT在储能方面、复合材料领域、生物医学工程、场发射领域的应用。其中场发射领域的应用将作为本文的研究重点。
第二章碳纳米管制备以及相应的场发射显示器阴极薄膜制作
本章详尽地介绍了CNT的化学气相沉积法、电弧放电法和激光蒸发法三种制备方法。其中着重介绍了化学气相沉积法制备CNT的相关工艺,包括了该方法所使用的催化剂的制备,并重点阐述了基于化学气相沉积法制备CNT来制作场发射阴极薄膜的工艺。
第三章多壁碳纳米管薄膜场发射应用研究
本章主要介绍了两种用化学气相沉积法制备的CNT作为阴极材料制作的FED器件。本文采用丝网印刷法和直接生长法制备的CNT薄膜作为场发射阴极,制作成二极型结构的显示器件后测试其场发射性能。实验表明用直接生长法制备的CNT薄膜阴极具有较低的开启电压和较高的场发射电流密度,场发射性能优异。但丝网印刷法制备的CNT薄膜阴极也有一定的优势,如成本低、工艺成熟、适合大面积生产等。本文在研究了两种CNT薄膜阴极的制备方法和场发射性能研究的基础上,提出了CNT阴极FED目前存在的问题及对未来的展望。
As a great discovery after C60 in the field of carbon materials,carbon nanotube is a concentric hollow tube which is curled by one graphite sheet or more. Because of peculiar structure, physical and chemical properties,carbon nanotube has attracted much attention in variety of fields and is considered to be the nanomaterial which has most theoretical research and application value. Carbon nanotube has high surface area, high mechanical strength, chemical stability and excellent electrical conductivity in the axial to transmit electrons. Nano-scale points and defects in walls form good electron transmitting terminal. Among field emission cathode materials.carbon nanotube has low turn-on voltage and high field emission current density and so on. Consequently carbon nanotube becomes the most potential field emission cathode materials instead of diamond and Si. At the beginning,this paper describes carbon nanotubes' discovery, structure, basic properties, preparation and related applications, specifically introduces the application in field emission cathode materials in detail. Then direct growth on substrate method and transplantation method are studied to fabricate field emission cathode. Meanwhile.the deep research into optical characteristics and electrical characteristics are carried out. Finally, lots of deficiencies and some possible measures to improve field emission property have been related which will be the focus of future work.
ChapterⅠIntroduction
In this chapter, the discovery of carbon nanotubes is reviewed. Then the structure characteristics, categories and performance characteristics of carbon nanotubes are briefly introduced. Base on these,some applications of carbon nanotubes are investigated in detail, including storage energy, nano-composite materials, biomedicine engineering and field emission materials. Then this text especially focuses on the field emission application.
Chapter II Preparations of Carbon Nanotubes and Related Production of Thin Film Field Emission Cathode
In this chapter, the technologies and conditions for the growth of carbon nanotubes are discussed for different methods, which include the chemical vapor deposition method, the arc discharge method and the laser ablation method. In this text we mainly focuses on carbon nanotubes'preparation using chemical vapor deposition method and the preparation of the catalyst. Then based on this, this chapter investigates the production process of the thin film field emission cathode further.
Chapter III The Research of Carbon Nanotube Field Emission Film
This chapter presents two types of field emission display device whose cathode materialls are carbon nanotube films prepared by chemical vapor deposition method. We test the field emission properties of the two types of device using diode structures whose cathode films are produced by direct growth on substrate method and screen-printing process respectively. Experimental results show that, the field emission cathode film grown on substrate has lower turn-on voltage and higher brightness so that it is considered as excellent field emission cathode. Meanwhile. the field emission cathode film produced by screen-printing process has its own advantages.such as lower cost, mature technology,easy to obtain large area manufacture. Finally based the research above,we analyze the problems which the carbon nanotubes cathodes of field emission display still have, and make some prospects in these aspects.
引文
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