基于氧化锌纳米线表面传导场发射阴极的研究

Study on surface-conducted field emission cathode with ZnO nanowires

利用热蒸发和丝网印刷技术在玻璃基底上成功制备了氧化锌纳米线表面传导场发射阴极阵列,并测试其场发射性能。扫描电镜表明,在氩气和氧气流量分别为60和1mL/min,反应温度550℃保温30min条件下制备的氧化锌纳米线均匀垂直生长在玻璃基底上,直径大约在80～200nm,长度>7μm。场发射测试表明,在阳压2000V和阴阳间距为500μm时,ZnO纳米线表面传导场发射阴极的开启电压为70V;在栅压为96V时,电子发射效率为26.2%,高于传统报道的表面传导电子发射器件,在经过80min的老练后发射接近稳定,平均发射电流接近135μA,表明ZnO纳米线表面传导场发射阴极有着稳定高效的场发射性能。

Surface-conducted field emission cathode with ZnO nanowires（ZnO-SCFE） has been successfully fabricated on the glass substrate by thermal evaporation and screen printing and its field emission（FE） characteristics were also investigated.SEM shows that the diameters of aligned and quasi-perpendicular ZnO nanowires synthesized on the glass substrate at reaction temperature of 550℃ for 30min under a flow rate of 60mL/min of Ar and 1mL/min of O2 were scattered in a range of 80-200nm and the length up to 7μm.FE indicates that its turn-on voltage was approximately 70V and electron-emission efficiency was around 26.2% which was more higher than that of surface-conducted emission display（SED） when the gate and anode voltage was 96V and 2000V,respectively,at the anode-cathode spacing of 500μm.In addition,the emission current of ZnO-SCFE cathode was about 135μA after aging for 80min.Moreover,it exhibited a stability without a great degradation,which indicates the ZnO-SCFE cathode has a stable and efficient FE properties.