Dealloying solution dependence of fabrication, microstructure and porosity of hierarchical structured nanoporous copper ribbons

• We present one-pot route to synthesize hierarchical structured nanoporous copper.
• Dealloying solution affects fabrication, microstructure and porosity of products.
• DSDS of Cu in acid medium is two orders of magnitude greater than in alkaline medium.
• Microstructure and porosity of resultant products can be effectively tuned.
• This work will have implications for facilely fabricating novel porous materials.

The monolithic hierarchical structured nanoporous copper ribbons (HSNCRs) have been facilely fabricated by one-pot chemical dealloying of dual-phase Al 27 at.% Cu alloy with hypereutectic structure. The results show that dealloying solution has a key influence on fabrication, microstructure and porosity of products. The HSNCRs are composed of interconnected large-sized maze/river-shape channels with laminated/uniform porous channel walls upon dealloying in acidic/alkaline medium. The specific surface area of samples by dealloying in alkaline solution is two times larger than that in acidic solution. Additionally, microstructure (morphology, sizes and distribution) and porosity of products can be tuned effectively by changing dealloying solution.

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