FABRICATION OF MICRO-NANO HIERARCHICAL Cu STRUCTURES ON ENGINEERING SUBSTRATE BY HYBRID LASER APPROACH AND THEIR APPLICATION TO PHOTODEGRADATION OF METHYL ORANGE UNDER VISIBLE LIGHT

摘要

Surface micro-nano structures show excellent properties such as wettability control (hydrophilic, hydrophobic), optical property control, micro-nano tribology, hydrodynamic/aerodynamic property control, cell adhesion and adhesion control, which is one of the frontier topics in nano science and technology research. We developed a hybrid approach including laser deposition, laser ablation and chemical dealloying for fabricating tunable micro-nano hierarchical Cu structure on engineering substrate surface. The structure consists of micro bumps with a width of 50 μm and a height of 100 μm, and nanoporous structures with a size of 70-150 nm on the micro bumps. The morphology of micro and nano structure can be tunable through the parameters of laser ablation and chemical dealloying. XRD and XPS results confirm that these hierarchical structures were made of Cu_2O.