通过丝网印刷将四针状纳米氧化锌(tetrapod-liked zinc oxide nanoneedles, T-ZnO)转移到电极表面, 采用旋涂的方法在T-ZnO阵列上方形成连续的、悬浮结构的还原石墨烯(reduced graphene oxide, rGO)层薄膜, 制备出以T-ZnO为支撑层的T-ZnO/rGO复合薄膜冷阴极。实验表明: 相对于T-ZnO阴极, T-ZnO/rGO薄膜阴极发射电流密度提高、开启场强与阈值场强降低, 其开启场强为2.5 V/μm (电流密度10 μA/cm2), 阈值电场为3.8 V/μm (电流密度为1 mA/cm2), 具有良好的场发射性能。

Field emitters with excellent field emision properties based on suspended reduced graphene oxide (rGO) layer supported by tetrapod-like zinc oxide (T-ZnO) nanostructure were proposed. The T-ZnOs were transferred onto silver electrodes by screen-printing. Then, continuous and floating rGO films were deposited on the T-ZnO layer by spin-coating. The T-ZnO/rGO emitters exhibited field emission performances with higher emission current density and lower operation voltage when compared with the pure T-ZnO emitters. The results show that the T-ZnO/rGO emitters exhibited field emission properties with a turn-on field of 2.5 V/μm (current density as 10 μA/cm2) and a threshold field of 3.8 V/μm (current density as 1 mA/cm2).