Nodular Carbon Nanotubes and Their Field Emission Characteristics

• 来源期刊: 中国物理快报（英文版）
• 学科: 物理学
• 年，卷（期）: 2002,（7）
• 页码范围: 1021-1023
• 页数: 3页
• 分类号: O4
• 语种: 英文

摘要

A new configuration of carbon nanotubes (CNTs) has been discovered in our laboratory and their surfaces arefully covered with nano-sized node-like structures. The node structures have almost the same size of 40 - 50 nm.We refer to this material as the nodular carbon nanotube (NCNT). Field emission scanning electron microscopyshows that after a hydrogen plasma process in our homemade plasma equipment, the common carbon nanotubeswere changed into NCNTs. The experimental result demonstrates that this material has good field emissioncharacteristics, Iow threshold field, stable and suitable emitting current, especially for the emission site densityup to the order of 106cm-2.