四针状氧化锌/还原氧化石墨烯复合阴极的场发射性能研究
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摘要
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10μA/cm~2),阈值电场为3.8 V/μm (电流密度为1 mA/cm~2),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/cm~2) and a threshold field of 3.8 V/μm(current density as 1 mA/cm~2).
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/cm~2) and a threshold field of 3.8 V/μm(current density as 1 mA/cm~2).
引文
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[9] Ye D, Moussa S, Ferguson J D, et al, Samy El-Shall M. Highly efficient electron field emission from graphene oxide sheets supported by nickel nanotip arrays [J]. Nano Letters, 2012, 12(3): 1265-1268.
[10] Yang Z, Zhao Q, Ou Y, et al. Enhanced field emission from large scale uniform monolayer graphene supported by well-aligned ZnO nanowire arrays[J]. Applied Physics Letters, 2012, 101: 173107.
[11] Wu C, Kim T W, Li F, Zhang Y, et al. Unique visible-light-assisted field emission of tetrapod-shaped ZnO/reduced graphene-oxide core/coating nanocomposites [J]. Scientific Reports, 2016, 6: 38613.
[12] Zhou X, Lin T, Liu Y, et al. Structural, optical, and improved field-emission properties of tetrapod-shaped Sn-doped ZnO nanostructures synthesized via thermal evaporation [J]. ACS Applied Materials & Interfaces, 2013, 5(20): 10067-10073.
[13] Hummers W, Offeman R. Preparation of graphitic oxide[J]. Journal of American Chemistry Society, 1958, 80(6): 1339-1344.
[14] Wu C, Li F, Zhang Y, et al Guo T. Formation and field emission of patterned zinc oxide-adhering graphene cathodes [J]. Vacuum, 2013, 89:57-61.
[15] Fowler R H, Nordheim L. Electron emission in intense electric fields[J]. Proceedings of the Royal Society of London. Series A, 1928, 119(781): 173-181.
[2] 高金海,李桢,张武勤,等. 高亮度金刚石薄膜场发射荧光管的制作[J]. 光电子技术, 2013, 33(1): 1-4.
[3] Chen L, He H, Yu H, et al. Electron field emission characteristics of graphene/carbon nanotubes hybrid field emitter[J]. Journal of Alloys and Compounds, 2014, 610: 659-664.
[4] Zhang Y A, Lin J Y, Wu C X, et al. Stable field emission from planar-gate electron source with MWNTs by electrophoretic deposition [J]. Solid-State Electronics, 2012, 67(1): 6-10.
[5] Zhang Y A, Wu C X, Lin J Y, et al An improved planar-gate triode with CNTs field emitters by electrophoretic deposition [J]. Applied Surface Science, 2011, 257(8): 3259-3264.
[6] Wu C, Li F, Zhang Y, Guo T. A surface-conducted field emission device with suspended graphene cathodes [J]. Applied Surface Science, 2013, 273: 432-436.
[7] Deng J, Zheng R, Zhao Y, et al Vapor-Solid Growth of Few-Layer Graphene Using Radio Frequency Sputtering Deposition and Its Application on Field Emission [J]. ACS Nano, 2012, 6(5): 3727-3231.
[8] Wu C, Li F, Zhang Y, Guo T. Field emission from vertical graphene sheets formed by screen-printing technique [J]. Vacuum, 2013, 94: 48-52.
[9] Ye D, Moussa S, Ferguson J D, et al, Samy El-Shall M. Highly efficient electron field emission from graphene oxide sheets supported by nickel nanotip arrays [J]. Nano Letters, 2012, 12(3): 1265-1268.
[10] Yang Z, Zhao Q, Ou Y, et al. Enhanced field emission from large scale uniform monolayer graphene supported by well-aligned ZnO nanowire arrays[J]. Applied Physics Letters, 2012, 101: 173107.
[11] Wu C, Kim T W, Li F, Zhang Y, et al. Unique visible-light-assisted field emission of tetrapod-shaped ZnO/reduced graphene-oxide core/coating nanocomposites [J]. Scientific Reports, 2016, 6: 38613.
[12] Zhou X, Lin T, Liu Y, et al. Structural, optical, and improved field-emission properties of tetrapod-shaped Sn-doped ZnO nanostructures synthesized via thermal evaporation [J]. ACS Applied Materials & Interfaces, 2013, 5(20): 10067-10073.
[13] Hummers W, Offeman R. Preparation of graphitic oxide[J]. Journal of American Chemistry Society, 1958, 80(6): 1339-1344.
[14] Wu C, Li F, Zhang Y, et al Guo T. Formation and field emission of patterned zinc oxide-adhering graphene cathodes [J]. Vacuum, 2013, 89:57-61.
[15] Fowler R H, Nordheim L. Electron emission in intense electric fields[J]. Proceedings of the Royal Society of London. Series A, 1928, 119(781): 173-181.