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针对单层掺混结构改善丝网印刷碳纳米管(CNT)薄膜场发射性能的局限性,提出了一种能有效改善CNT薄膜场发射性能的双层掺混结构。相比传统单层掺混结构的CNT阴极薄膜,双层掺混薄膜中上层TiO2介质掺混结构能有效提高CNT的增强因子,下层导电纳米钛粉掺混结构能降低CNT与衬底电极间的接触电阻、提高CNT导电网络的电子传输能力。场发射I-V特性测试表明,当CNT和钛的掺混质量比为1∶1且氮气中预烧温度为450℃时,双层掺混结构CNT薄膜的开启场强为1.53V/μm,电流密度在场强为2.0V/μm时达79.5μA/cm2。该方法为改善丝网印刷CNT薄膜的场发射性能提供了一种可行方案。
Aiming at the limitation of improving the field emission properties of screen printed carbon nanotubes (CNTs) films by single-layer blending structure, a double-layer hybrid structure that can effectively improve the field emission properties of CNT films was proposed. Compared with the traditional single-layer CNT cathode film, the doping of the upper TiO2 medium in the double-layer blend film can effectively increase the enhancement factor of the CNTs. The doping of the lower conductive nano-titanium powder can reduce the difference between the CNT and the substrate electrode Contact resistance, improve the CNT conductive network electronic transmission capacity. Field emission IV characteristics test showed that the open field strength of the double-layered CNT film was 1.53V / μm when the mass ratio of CNT to titanium was 1: 1 and the pre-calcination temperature in nitrogen was 450 ℃. The current density The field intensity of 2.0V / μm reached 79.5μA / cm2. This method provides a feasible solution to improve the field emission properties of screen printed CNT films.