使用碳纳米管在扁平金属尖端上滴干制备微型 X 射线管的稳定场发射器。

Stable Field Emitters for a Miniature X-ray Tube Using Carbon Nanotube Drop Drying on a Flat Metal Tip.

机构信息

Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong, Yuseong, Daejeon, 305-701, Republic of Korea.

出版信息

Nanoscale Res Lett. 2010 Jan 23;5(4):720-4. doi: 10.1007/s11671-010-9537-x.

DOI:10.1007/s11671-010-9537-x

PMID:20672136

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2893921/

Abstract

Stable carbon nanotube (CNT) field emitters for a vacuum-sealed miniature X-ray tube have been fabricated. The field emitters with a uniform CNT coating are prepared by a simple drop drying of a CNT mixture solution that is composed of chemically modified multi-walled CNTs, silver nanoparticles, and isopropyl alcohol on flat tungsten tips. A highly thermal- and electrical-conductive silver layer strongly attaches CNTs to the tungsten tips. Consequently, the field emitters exhibit good electron emission stability: continuous electron emission of around 100 μA at 2.3 V/μm has stably lasted over 40 h even at non-high vacuum ambient (~10-3 Pa).

摘要

已制备出用于真空密封微型 X 射线管的稳定碳纳米管 (CNT) 场发射器。通过简单的滴涂法将 CNT 混合物溶液（由化学改性的多壁 CNT、银纳米粒子和异丙醇组成）涂覆在平坦的钨尖端上，制备出具有均匀 CNT 涂层的场发射器。高导热和导电的银层将 CNT 牢固地附着在钨尖端上。因此，场发射器表现出良好的电子发射稳定性：即使在非高真空环境（~10-3 Pa）下，在 2.3 V/μm 下也能稳定地持续约 100 μA 的连续电子发射超过 40 小时。