US Patent 7244493 Coated article

In one embodiment, a coated article comprises a substrate with a coating comprising diamond like carbon layer, wherein the diamond like carbon layer comprising carbon and sulfur as terminal sulfur functional groups, wherein greater than or equal to about 70 wt % of the carbon present in the diamond like carbon layer comprises a sp3 carbon-to-carbon bond. The diamond like carbon layer has a concentration gradient such that the diamond like carbon layer on a side toward the substrate comprises a lower concentration of sulfur than a surface of the diamond like carbon layer disposed on a side of the layer opposite the substrate. The surface comprises about 0.1 at % to about 15 at % sulfur.