Relationship between dealloying conditions and coarsening behaviors of nanoporous copper fabricated by dealloying Cu-Ce metallic glasses
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第7期
论文作者：Ning Wang Ye Pan Shikai Wu
文章页码：1162 - 1171
摘 要：Monolithic nanoporous copper（NPC） with tunable ligament size（107–438 nm） was synthesized by dealloying a new Cu-Ce binary glassy precursor in dilute H2SO4 aqueous solution. The effects of the dealloying conditions on the morphologies of NPC were evaluated comprehensively. The results show that the ligaments of NPC can significantly coarsen with the increase of acid concentration, elevation of reaction temperature or prolongation of immersion time. These coarsening behaviors can be well described by a diffusion based growth kinetic model. Moreover, the surface diffusivity and activation energy for diffusion of Cu atoms were also estimated to investigate the formation mechanism of NPC, which is mainly governed by dissolution of Ce element in the glassy precursor coupled with nucleation and growth of Cu clusters via the precursor/solution interface. In the experiment of the degradation of methyl orange（MO） dye, the NPC fabricated by Cu-Ce metallic glasses exhibits superior sono-catalytic activity.
Ning Wang，Ye Pan，Shikai Wu
School of Materials Science and Engineering, Southeast University, Jiangsu Key Laboratory for Advanced Metallic Materials
摘 要：Monolithic nanoporous copper（NPC） with tunable ligament size（107–438 nm） was synthesized by dealloying a new Cu-Ce binary glassy precursor in dilute H2SO4 aqueous solution. The effects of the dealloying conditions on the morphologies of NPC were evaluated comprehensively. The results show that the ligaments of NPC can significantly coarsen with the increase of acid concentration, elevation of reaction temperature or prolongation of immersion time. These coarsening behaviors can be well described by a diffusion based growth kinetic model. Moreover, the surface diffusivity and activation energy for diffusion of Cu atoms were also estimated to investigate the formation mechanism of NPC, which is mainly governed by dissolution of Ce element in the glassy precursor coupled with nucleation and growth of Cu clusters via the precursor/solution interface. In the experiment of the degradation of methyl orange（MO） dye, the NPC fabricated by Cu-Ce metallic glasses exhibits superior sono-catalytic activity.
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