Low temperature synthesis of diamond-based nano-carbon composite materials with high electron field emission properties

A diamond-based nano-carbon composite (d/NCC) material, which contains needle-like diamond grains encased with the nano-graphite layers, was synthesized at low substrate temperature via a bias enhanced growth process using CH4/N-2 plasma. Such a unique granular structure renders the d/NCC material very conductive (sigma = 714.8 S/cm), along with superior electron field emission (EFE) properties (E-0 = 4.06 V/mu m and J(e) = 3.18 mA/cm(2)) and long lifetime (tau = 842 min at 2.41 mA/cm(2)). Moreover, the electrical conductivity and EFE behavior of d/NCC material can be tuned in a wide range that is especially useful for different kind of applications. (C) 2015 AIP Publishing LLC.