Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing, People's Republic of China.
Nanotechnology. 2011 Mar 18;22(11):115703. doi: 10.1088/0957-4484/22/11/115703. Epub 2011 Feb 4.
In this work, needle-shaping of tungsten oxide nanowires occurred during field emission characterization. Compared with nanowires with a flat apex, needle-shaped emitters showed a lower threshold field of 11.9 V µm(-1) for 1 mA cm(-2) and a higher emission current of 1120 µA at 16.2 V µm(-1). Most notably, the measured ageing current dramatically increased by more than four times until it slightly decreased, tending towards stability. In addition, the samples showed striking difference in their nonlinear Fowler-Nordheim plot before and after ageing tests. Selected area diffraction and transmission electron microscope characterizations were used to further study these amazing results.
在这项工作中，在场发射特性表征过程中发生了氧化钨纳米线的针状化。与具有平顶的纳米线相比，针状发射体表现出更低的阈值场，为 11.9 V µm(-1) 时达到 1 mA cm(-2)，在 16.2 V µm(-1) 时达到 1120 µA 的更高发射电流。值得注意的是，测量的老化电流在急剧增加超过四倍后才略有下降，趋于稳定。此外，样品在老化测试前后的非线性 Fowler-Nordheim 图中表现出显著差异。选区衍射和透射电子显微镜表征被用来进一步研究这些惊人的结果。
