Nanocrystalline hexagonal diamond formed from glassy carbon

Nanocrystalline hexagonal diamond formed from glassy carbon

Carbon exhibits a large number of allotropes and its phase behaviour is still subject to significant uncertainty and intensive research. The hexagonal form of diamond, also known as lonsdaleite, was discovered in the Canyon Diablo meteorite where its formation was attributed to the extreme conditions experienced during the impact. However, it has recently been claimed that lonsdaleite does not ...

Thermionic emission from surface-terminated nanocrystalline diamond

Thermionic electron emission forms the basis of both electron sources for a variety of applications and a direct energy conversion process that is compact and scalable. The present study characterizes thermionic emission from boron-doped nanocrystalline diamond films with hydrogen and nitrophenyl surface termination layers. A hemispherical energy analyzer was used to measure electron energy dis...

Enhanced optoelectronic performances of vertically aligned hexagonal boron nitride nanowalls-nanocrystalline diamond heterostructures

Field electron emission (FEE) properties of vertically aligned hexagonal boron nitride nanowalls (hBNNWs) grown on Si have been markedly enhanced through the use of nitrogen doped nanocrystalline diamond (nNCD) films as an interlayer. The FEE properties of hBNNWs-nNCD heterostructures show a low turn-on field of 15.2 V/μm, a high FEE current density of 1.48 mA/cm(2) and life-time up to a period...

Evidence of diamond nanowires formed inside carbon nanotubes from diamantane dicarboxylic acid.

Synthesis of Nanocrystalline Diamond and 6H Diamond Polytype

Spherules in sediments across the Cretaceous-Tertiary (K/T) transition in Central America and the Caribbean are commonly interpreted as ejecta from the Chicxulub impact on Yucatan. Their stratigraphic ages, however, are variable spanning from the late Maastrichtian to the early Danian. Figure 1. Locations of spherule-bearing K/T boundary sections in Central America, and the Caribbean. In northe...