Diamond plates on dome-like particles: preparation, characterization and field emission properties

Abstract

Thin diamond microplates have been grown on dome‐like/hemispherical carbon particles on titanium carbide by a microwave plasma chemical vapour deposition (MPCVD) method using a gas mixture of methane and hydrogen. The diamond microplates have a thickness of about 200 nm. A thin (300 nm) film of titanium carbide was formed during carburization of sputtered titanium on an Si(100) substrate in MPCVD. The hemispherical carbon particles were covered with diamond microplates. The diamond microplates are isolated electron‐emitting spherules and exhibit a low threshold (50 V µm−1) and high current density (0.92 mA cm−2) in their field emission properties. A possible mechanism for the formation of the diamond microplates and hemispherical carbon particles is presented.

Heat Dissipation Interfaces Based on Vertically Aligned Diamond/Graphite Nanoplatelets

“…Nanocrystalline diamond (NCD) combines a unique set of propertieshigh hardness, high thermal conductivity, optical transparency, negative electron affinity, biocompatibility, and chemical inertness–that makes it an interesting solution for a wide plethora of applications such as in wear-resistant components, heat dissipators, infrared lenses, electron field emitters, and biosensors. , High-quality NCD coatings can be synthesized by the chemical vapor deposition (CVD) technique based on a continuous renucleation mechanism of nanometric equiaxial crystals, resulting in very smooth surfaces. , However, changing the deposition conditions in order to obtain peculiar configurations can modify this type of morphology, envisaging specific applications. This was the purpose of a few authors that have been focused on the development of NCD coatings with vertically aligned 2D nanodiamond crystals named as nanoplatelets or nanosheets. − …”