Research Progress of Carbon Nanotubes Field-Emission Current Saturation

Part II Field Emission from Carbon Nanotubes

First-principles study of field emission of carbon nanotubes

Field emission properties of the ~10,10! carbon nanotube are investigated with a first-principles approach. Emission currents are obtained through integrations of the time-dependent Schrödinger equation. We find that the emission current from the states localized at the tip end is more than ten times greater than direct contributions from extended metallic (p and p*) states. The spatial distrib...

Field emission properties of double-wall carbon nanotubes

Using a first-principles method, we study field emission properties of double-wall carbon nanotubes with various end geometries and combinations of inner and outer walls. The open double-wall nanotubes exhibit substantial contribution to the emission current from the extended π states. These states are insensitive to the detailed tip structure or the presence of foreign adsorbed molecules and t...

Fabrication of carbon nanotubes field emission cathode by composite plating.

Carbon nanotubes (CNTs) have high aspect ratio and have great potential to be applied as the field emission cathode because of its large field enhancement factor. In this work, a high performance carbon nanotube field emission cathode (CNTFC) was fabricated by using a composite plating method. The CNTs were purified by acid solutions and then dispersed in electrobath with nickel ions at tempera...

Field emission properties of carbon nanotubes with different morphologies

The field emission behavior of base-model well-aligned carbon nanotubes (Base-CNTs), curled carbon nanotubes (Curled-CNTs), and tipmodel well-aligned CNTs (Tip-CNTs) was examined. The nanotubes were fabricated by means of direct current plasma-enhanced chemical vapor deposition using different ammonia (NH3) pre-treatment plasma currents. The turn-on electric field values required to obtain a 10...