Plasma polymerization of fluorocarbon monomers

X-ray diffraction analyses indicate that electrodeposited black chrome and black zinc surfaces can be characterized by a metal-to-metal-oxide ratio that decreases (from 3.65 to 0.33 for black zinc and from 4.00 to 0.58 for black chrome) with increasing temperature of thermal exposure and this decrease correlates with the degradation observed in the optical selectivity $\text{(}\text{α}{}_{\mathrm{s}}\text{?}{}_{\mathrm{t,H}}\text{)}$ properties of these overgrowths. While black chrome surfaces are stable up to 500°C, black zinc surfaces (used in this study) degrade optically when heated to above 250°C. When the temperature of heat treatment is increased (from ambient to 300°C for black zinc and from ambient to 600 °C for black chrome) the particles comprising these surfaces increase in size (from 90 to 157 nm for black zinc and from 106 to 193 nm for black chrome) and exhibit a more spherical appearance in comparison with the more faceted particles comprising the as-plated surfaces.