Abstract
The microstructure of copper films prepared by a new sputtering apparatus, which was fabricated to enhance the shadowing effect, was investigated by scanning electron microscopy. Black copper films were deposited on copper wires at an Ar pressure of 10 Pa. The black films had an extremely porous structure composed of separated columns. This structure is quite similar to that of black titanium films prepared by cylindrical magnetron sputtering. These results suggest that the porous structure composed of separated columns is easily formed for metal films by enhancing the shadowing effect.
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