Field Emission from Hybrid Diamond-like Carbon and Carbon Nanotube Composite Structures

Abstract

A thin diamond-like carbon (DLC) film was deposited onto a densely packed "forest" of vertically aligned multiwalled carbon nanotubes (VACNT). DLC deposition caused the tips of the CNTs to clump together to form a microstructured surface. Field-emission tests of this new composite material show the typical low threshold voltages for carbon nanotube structures (2 V μm(-1)) but with greatly increased emission current, better stability, and longer lifetime.

High-performance field emission device utilizing vertically aligned carbon nanotubes-based pillar architectures

“…Zanin et al calculated theoretical geometrical enhancement factor β around 2000 on the basis of the ratio of height and radius of individual nanotubes. 20 In present case, the higher enhancement factor β is due to the special geometry of the vertical aligned CNTs providing enhancement in local electric field in pillar structure, as a result emission integrates multifold times due to several adjacent emitting tip rather than being from one isolated CNTs. The enhancement factor increases enormously as compared to the theoretical limits of vertical aligned CNTs.…”

Large field emission current and density from robust carbon nanotube cathodes for continuous and pulsed electron sources

“…where A and B are the temperature-independent constants (A = 1.54×10 −6 A eV V −2 and B = 6.83×10 9 eV −3/2 V m −1 ), ϕ is the work function and here assumed to be 5 eV for CNTs [ 29,30], β is the field enhancement factor, J and E are the emission current density and applied electric field, respectively. The plot of ln(j/E 2 ) versus 1/E is called the F-N plot and β is given by the following expression…”

Effect of gold oxide incorporation on electrochemical corrosion resistance of diamond-like carbon

“…4 shows the typical Raman spectra of the AuO x :DLC and DLC films without nanoparticles. Both DLC films are composed of two broad bands that are approximately at~1400 cm − 1 (D band) and 1550 cm − 1 (G band) [28]. The peak positions of the D and G bands were determined.…”