Electron field emission from single-walled carbon nanotube nonwoven

• 来源期刊: 中国物理（英文版）
• 关键词: single-walled carbon nanotubes field
• 年，卷（期）: 2006,（2）
• 页码范围: 422-427
• 页数: 6页
• 语种: 英文

摘要

Field emission from single-walled carbon nanotube (SWNT) nonwoven has been investigated under high vacuum with different vacuum gaps. A low turn-on electric field of 1.05 V/μm is required to reach an emission current density of 10 /μA/cm2. An emission current density of 10 mA/cm2 is obtained at an operating electric field of 1.88V/μm. No current saturation is found even at an emission current of 5 mA. With the vacuum gap increasing from 1 to 10 mm, the turn-on field decreases monotonically from 1.21 to 0.68 V/μm, while the field amplification is augmented. The good field-emission behaviour is ascribed to the combined effects of the intrinsic field emission of SWNT and the waved topography of the nonwoven.