本文選題：場發(fā)射　切入點：碳納米管　出處：《鄭州大學》2017年碩士論文

【摘要】：碳納米管自被發(fā)現(xiàn)以來,由于其具有特殊的構(gòu)造、優(yōu)秀的各項性能以及潛力巨大的應用前景而引發(fā)科技界的廣泛關(guān)注,被譽為新世紀材料革命的引發(fā)劑。碳納米管由于其自身有著納米級別的尖端以及極高的縱橫比等優(yōu)異特點,使得其在作為場發(fā)射陰極制作材料之中擁有十分巨大的優(yōu)勢,是一種潛力巨大的場發(fā)射陰極材料。本文首先介紹了碳納米管場發(fā)射陰極國內(nèi)外的研究現(xiàn)狀,接著詳細介紹了碳納米管,包括碳納米管的分類、性能、制備以及應用,并就場發(fā)射理論作了詳細深入的研究,還對碳納米管場發(fā)射器件以及場發(fā)射器件的應用作了深入的介紹。然后,本文通過使用絲網(wǎng)印刷法以及旋轉(zhuǎn)涂覆法制備出了碳納米管陰極薄膜,對漿料的配比以及制作工藝等進行了研究,并對制備的碳納米管薄膜進行了場發(fā)射性能測試。最后,通過使用熱處理以及毛刷法綜合后期處理方法對碳納米管薄膜進行處理,來提高其場發(fā)射性能。根據(jù)場發(fā)射性能測試以及掃描電子顯微鏡分析,得出以下研究結(jié)果:1、采用絲網(wǎng)印刷法得到的碳納米管陰極薄膜,通過對其進行場發(fā)射性能測試,發(fā)現(xiàn)其開啟電壓為2.22 V/μm,當電場強度為4.44 V/μm時,場發(fā)射電流密度為300μA/cm~2。2、相同漿料配比條件下,采用旋轉(zhuǎn)涂覆法制備出的碳納米管陰極薄膜,測試后發(fā)現(xiàn)其場發(fā)射性能有了明顯的改善。開啟電壓由2.22 V/μm降為1.90V/μm,在4.4 V/μm的電場強度下,電流密度從300μA/cm~2上升為450μA/cm~2。3、采用旋轉(zhuǎn)涂覆法制備碳納米管薄膜,并對碳納米管薄膜進行熱處理以及毛刷法處理,結(jié)果顯示,經(jīng)過后處理的碳納米管陰極薄膜電流密度在相同的條件下(4.4V/μm)從450μA/cm~2上升至1000μA/cm~2,并且在場發(fā)射測試中的發(fā)光亮度與密度均有了極大的提升。
[Abstract]:Since its discovery, carbon nanotubes (CNTs) have attracted wide attention in science and technology because of their special structure, excellent properties and potential applications. Carbon nanotubes (CNTs) are regarded as the initiators of material revolution in the new century. Because of their excellent characteristics of nano-level tip and extremely high aspect ratio, carbon nanotubes (CNTs) have great advantages in fabricating materials as field emission cathodes. Carbon nanotube field emission cathode is a potential field emission cathode material. In this paper, the research status of carbon nanotube field emission cathode at home and abroad is introduced, and then the classification, properties, preparation and application of carbon nanotubes are introduced in detail. The field emission theory is studied in detail, and the applications of carbon nanotube field emission devices and field emission devices are also introduced. In this paper, carbon nanotube cathode films were prepared by screen printing and rotating coating. The slurry ratio and fabrication process were studied, and the field emission properties of the prepared carbon nanotube films were tested. The field emission properties of carbon nanotubes (CNTs) films are improved by means of heat treatment and comprehensive post-treatment with brush method, according to the field emission test and scanning electron microscopy (SEM) analysis. The following results were obtained: 1. The cathode film of carbon nanotube was obtained by screen printing method. The field emission performance of the film was tested. It was found that the opening voltage was 2.22 V / 渭 m, and the electric field intensity was 4.44 V / 渭 m. The cathode film of carbon nanotube was prepared by rotating coating method under the same slurry ratio and the field emission current density was 300 渭 A / cm ~ (-2). It is found that the field emission performance of the film has been improved obviously, the on-off voltage has been reduced from 2.22V / 渭 m to 1.90V/ 渭 m, and the current density has been increased from 300 渭 A/cm~2 to 450 渭 A / cm ~ (2. 3) at the electric field intensity of 4.4 V / 渭 m. The carbon nanotube thin films have been prepared by rotating coating method. The carbon nanotube film was treated by heat treatment and brush method. The results showed that, The current density of the post-treated carbon nanotube cathode film increased from 450 渭 A/cm~2 to 1000 渭 A / cm ~ (2) under the same conditions, and the luminance and density in the field emission test were greatly improved.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB383.2;TQ127.11

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本文編號：1681988