Abstract
In this article, Al75Cu25 (at.%) ribbons were dealloyed by HCl, H2C2O4, H3PO4, and NaOH solutions, respectively, to prepare nanoporous copper (NPC). The dealloying behavior is varied with dealloying solutions, allowing modulating the microstructure and porosity of the NPC. Al75Cu25 ribbons are fully dealloyed in HCl, H2C2O4, and NaOH solutions, whereas they are partially dealloyed in H3PO4 solution. Except the NPC prepared in the NaOH solution, no obvious cracks are traced in other samples. The surface diffusivity (Ds) of Cu atoms along the alloy/solution interfaces is varied with solutions, producing the NPC with different microstructure. NPC with higher specific surface area can be obtained by dealloying the Al75Cu25 ribbons in the HCl solution. Compared with the dealloying in H2C2O4, H3PO4, and NaOH solutions, the dealloying in 10 wt% HCl solution for 25 min at 90 ± 1 °C facilitates the best NPC in this work.
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Acknowledgments
This study was supported by the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning and the National Natural Science Foundation of China (Grant Nos. 51671123, 51171105, and 50971086). B.G. Zhao acknowledges the support by the National Natural Science Foundation of China (Grant No. 51901125) and the Postdoctoral Science Foundation (Grant No. 2018M640376), P.R. China.
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Ma, H., Zhao, B., Ding, K. et al. Influence of dealloying solution on the microstructure of nanoporous copper through chemical dealloying of Al75Cu25 ribbons. Journal of Materials Research 35, 2610–2619 (2020). https://doi.org/10.1557/jmr.2020.69
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DOI: https://doi.org/10.1557/jmr.2020.69