| http://www.w3.org/ns/prov#value | - Preferred materials for use as the surface material include metals such as gold, silver, copper, cadmium, zinc, palladium, platinum,mercury, lead, iron, chromium, manganese, tungsten, and any alloys of the above when employed with sulfur-containing functional groups such as thiols, sulfides, disulfides, and the like; doped or undoped silicon employed with silanes and chlorosilanes;metal oxides suc
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