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Achromatic Copper Films
Diverse colors can be attained solely through manipulation of the surface of copper. Uniformly oxidizing the copper surface and controlling the thickness of the resulting oxide layer has proven that comprehensive natural coloration can be achieved. In article number 2210564, Young‐Min Kim, Se‐Young Jeong, and co‐workers fabricate a rough copper surface, characterized by dendrites,...
Copper surfaces that exhibit a wide range of achromatic colors while still metallic have not been studied, despite advancements in antireflection coatings. A series of achromatic copper films grown with [111] preferred orientation by depositing 3D porous nanostructures is introduced via coherent/incoherent atomic sputtering epitaxy. The porous copper nanostructures self‐regulate the giant oxidation...