Morphological variations in flame-deposited diamond

Abstract

An oxy-acetylene flame, impinging vertically upward on an Si(001) substrate, is systematically examined for morphological variations in the resulting diamond deposits. The flame is operated under near neutral (O2/C2H2 ratio near 1.0) conditions in the unconfined, open atmosphere. Singly twinned crystal morphologies in addition to the usual (001) faceted structures are observed and reported for the first time. Similar morphological variations are observed along the radial as well as the axial (vertical) coordinate directions in the flame. Large changes in morphology are observed for changes in vertical position as small as 50 μm.

Design of a Closed Loop Computer Controlled System for Selective Area Laser Deposition. I. Laser Systems, Gasflow, and Substrate Temperature Control

“…Forced convection can become significant when high gas velocities over the substrate are present and these gases are at a significantly different temperature than the substrate. Two examples of the latter are the oxyacetylene torch diamond CVD method (17)(18)(19)(20)(21)(22)(23)(24)(25)(26) and the thermal plasma method of diamond CVD (27)(28)(29). Both methods involve feed gases with a dimensionless temperature difference: TlaisseN and Marcus around 3-4.…”