Efficient field emission from ZnO nanoneedle arrays

作者：Yingchun Zhu, Hongzhou Zhang, Xiaoxiao Sun, S.Q. Feng, Jun Xu, Qing‐Tai Zhao, Bin Xiang, Rongming Wang, Dapeng Yu · 发表于：Applied Physics Letters · 年份：2003 · DOI：10.1063/1.1589166 · 被引用次数：511 · 研究领域：ZnO doping and properties、Nanowire Synthesis and Applications、Advanced Sensor and Energy Harvesting Materials

Well-aligned arrays of ZnO nanoneedles were fabricated using a simple vapor phase growth. The diameters of the nanoneedle tips are as small as several nanometers, which is highly in favor of the field emission. Field-emission measurements using the nanoneedle arrays as cathode showed emission current density as high as 2.4 mA/cm2 under the field of 7 V/μm, and a very low turn-on field of 2.4 V/μm. Such a high emission current density is attributed to the high aspect ratio of the nanoneedles. The high emission current density, high stability, and low turn-on field make the ZnO nanoneedle arrays one of the promising candidates for field-emission displays.