摘要
We developed a new scheme to suppress the electric-field-screening effect in high growth density of a carbon nanotube(CNT) film during its intense pulsed emission.We synthesize the CNT film on a tridimensional surface(t-CNT film).The tridimensional surface includes wet etched silicon pyramids,and the Ni layer is electroless plated thereon.The intense pulsed emission characteristics of the t-CNT and planar-grown CNT(p-CNT) films were measured using a diode structure in single-pulse mode.The even turn-on field decreased from 5.5 V/μm for p-CNTs to 2.8 V/m for t-CNTs,and the peak emission current increased from 232 A for p-CNTs to 324 A for t-CNTs at a peak field intensity ～12.2 V/m.The peak current of the t-CNT film increased by ～39.7% over the p-CNT film.It is clear that the micro-pyramid array can effectively suppress the field screening effect to improve the electron-emission of CNT films.
We developed a new scheme to suppress the electric-field-screening effect in high growth density of a carbon nanotube （CNT） film during its intense pulsed emission. We synthesize the CNT film on a tridimensional surface （t-CNT film）. The tridimensional surface includes wet etched silicon pyramids, and the Ni layer is electroless plated thereon. The intense pulsed emission characteristics of the t-CNT and planar-grown CNT （p-CNT） films were measured using a diode structure in single-pulse mode. The even turn-on field decreased from 5.5 V/μm for p-CNTs to 2.8 V/μm for t-CNTs, and the peak emission current increased from 232 A for p-CNTs to 324 A for t-CNTs at a peak field intensity -12.2 V/μm. The peak current of the t-CNT film increased by -39.7% over the p-CNT film. It is clear that the micro-pyramid array can effectively suppress the field screening effect to improve the electron-emission of CNT films.
基金
supported by the National Natural Science Foundation of China (51072184,50972132,51002143 and 60801022)
the Aeronautical Science Foundation of China (2009ZE55003 and 2010ZF55013)
the Basic and Advanced Technology Program of Henan (092300410139)
关键词
碳纳米管膜
发射特性
强流脉冲
金字塔
微阵列
合成
表面
碳纳米管薄膜
carbon nanotubes, micro-pyramid array, field-screening effect, intense pulsed emission, emission current
