摘要
针对碳纳米管场发射显示器亮度低、发光均匀性差的问题,提出了氧化锌掺杂的方法。通过将氧化锌(ZnO)颗粒和碳纳米管(CNTs)及其他有机物按比例配成浆料,丝网印刷制作了阴极试样。场发射特性研究结果表明:与具有同样印刷面积的普通CNT试样比较,掺杂试样的开启电场从1.70 V/μm降低到1.17 V/μm;在2.05 V/μm场强下发射电流从185μA上升到510μA。且掺杂氧化锌试样具有较好的发射稳定性和均匀性。通过微观表征和特性测试,初步推断场发射特性的提高的原因:由于混合掺杂试样中氧化锌地填充在碳纳米管之间或者覆盖在顶上,提高了膜层导电性,改善了发射体的热传导性,且增加了有效发射体密度。
A method of zinc oxide （ZnO） mixing is presented in order to improve low lightness and bad uniformity of carbon nanotubes （CNTs） filed emission display. The paste was synthesized by mixing Multi - walled CNTs, ZnO and organic vehicle, and the ZnO - CNT samples are fabricated with screen - printed technology. Compared to usual CNT film with same printing area, the turn - on electric field of ZnO - CNT film decreased from 2.2 V/μm to 1.17 V/μm, and emission current increased from 185 μA to 510 μA under 2.2 V/μm. Moreover, stability and uniformity of emission current is enhanced. By characterizing ZnO -CNT film via SEM and laser granularity analyze, it is evaluated that ZnO filled the interspaces of CNTs or covered topside of CNTs, high electric conductivity and thermal conductivity of the film are achieved, and active emitters increased. Hence better field emission characteristics are achieved.
出处
《功能材料与器件学报》
CAS
CSCD
北大核心
2008年第6期1001-1006,共6页
Journal of Functional Materials and Devices
基金
自然科学基金重点项目(60036010)
国家自然科学基金面向项目(60476037)
关键词
碳纳米管
氧化锌
场发射
稳定性
均匀性
carbon nanotube （CNT）
zinc oxide （ZnO）
field emission
stability
uniformity
