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为了提高碳纳米管(CNT)阴极膜的场发射均匀性和稳定性,同时改善CNT膜的制作过程,本文提出一种掺混纳米金刚石(D)制作高性能丝网印刷CNT膜的方法.通过掺混碳相纳米金刚石,形成结构匹配的CNT/D复合膜,CNT膜内的间隙势垒减少,发射体分散更均匀,膜层与基底接触面积增加;同时,结合纳米金刚石的负电亲和势和场发射特性,可有效提高CNT阴极膜的导电性,增大有效发射体的密度.场发射特性测试表明CNT/D复合膜能得到1.89 V/μm的低开启电场,在2.8 V/μm场强下,场发射电流密度远高于普通CNT膜,达到463μA/cm~2,与普通CNT阴极膜相比,CNT/D复合膜的场发射稳定性显著提高,在400℃热处理后CNT/D膜激发阳极发光更均匀.
In order to improve the field emission uniformity and stability of the carbon nanotube (CNT) cathode film and improve the fabrication process of the CNT film, a novel method of making CNT film with high performance by nano-diamond (D) The carbon nanotubes were doped with carbon nanotubes to form a structurally matched CNT / D composite membrane. The potential barriers in the CNTs decreased, the emitters dispersed more uniformly and the contact area between the membrane and the substrate increased. At the same time, And field emission characteristics can effectively improve the conductivity of the CNT cathode film and increase the density of the effective emitter.The field emission properties of the CNT / D composite film show that the CNT / D composite film can achieve a low ON electric field of 1.89 V / μm and a low ON electric field of 2.8 V / μm The field emission current density was much higher than that of ordinary CNT film, reaching 463μA / cm ~ 2. Compared with common CNT cathode film, the field emission stability of CNT / D composite film was significantly improved. After heat treatment, the CNT / D Film excitation anode shines more evenly.