Leiden Institute of Physics, Leiden University, Leiden, The Netherlands.
Nanotechnology. 2011 Jun 10;22(23):235308. doi: 10.1088/0957-4484/22/23/235308. Epub 2011 Apr 12.
A method is reported to make an electron source consisting of an individual multi-walled carbon nanotube (MWNT) mounted on a tungsten support tip, and cut to length using localized electron beam irradiation in a scanning electron microscope. The apex of the MWNT was transformed into a closed cap with at least one fullerene-like layer via an annealing process involving simultaneous heating and the extraction of an emission current of ∼ 1 mA. The electron emission occurred at localized emission sites. The electron emission showed Fowler-Nordheim behavior, was highly stable with time, and exhibited a low energy spread. The structure of the caps of two MWNTs was studied with transmission electron microscopy before and after the cap closure.
报道了一种方法，该方法使用电子束在扫描电子显微镜中进行局部辐照，将单个多壁碳纳米管 (MWNT) 安装在钨支撑尖端上并切成所需长度，从而制成电子源。通过涉及同时加热和提取约 1 mA 的发射电流的退火过程，MWNT 的尖端被转化为具有至少一个类富勒烯层的封闭帽。电子发射发生在局部发射点。电子发射表现出 Fowler-Nordheim 行为，随着时间的推移非常稳定，并且具有低的能量分散。在帽封闭前后，使用透射电子显微镜研究了两个 MWNT 帽的结构。
