Lin Bao, Döbeli Max, Mudie Stephen, Hawley Adrian, Hodgson Peter, Kong Lingxue, Spolenak Ralph, Dumée Ludovic F
Deakin University, Geelong, Institute for Frontier Materials, Waurn Ponds, 3216, Victoria, Australia.
ETH Zurich, Vladimir-Prelog-Weg 5, 8093, Zürich, Switzerland.
Sci Rep. 2018 Oct 18;8(1):15419. doi: 10.1038/s41598-018-33787-z.
The development of non-noble nano-porous metal materials is hindered by surface oxidation reactions and from the difficulty to generate long range order pore arrays. Dealloying is a promising route to generate such materials by selective chemical etching of metal alloy materials. This process can generate nano-metal materials with superior plasmonic, catalytic and adsorptive surface properties. Here, the impact of properties of the etching solution on the dealloying process to generate nano-pores across thin film alloys was investigated by in-situ SAXS dealloying experiments. Single phase CuZn alloys were used as model materials to evaluate the influence of the solution temperature on the pore formation kinetics. This novel analysis allowed to visualize the change in surface properties of the materials over time, including their surface area as well as their pore and ligament sizes. The dealloying kinetics at the very early stage of the process were found to be critical to both stable pore formation and stabilization. SAXS in-situ data were correlated to the morphological properties of the materials obtained from ex-situ samples by Rutherford back scattering and scanning electron microscopy.
非贵金属纳米多孔金属材料的发展受到表面氧化反应以及难以生成长程有序孔阵列的阻碍。脱合金化是通过对金属合金材料进行选择性化学蚀刻来制备此类材料的一种有前景的方法。该过程可以生成具有优异等离子体、催化和吸附表面性能的纳米金属材料。在此，通过原位小角X射线散射（SAXS）脱合金化实验研究了蚀刻溶液的性质对在薄膜合金上生成纳米孔的脱合金化过程的影响。单相铜锌合金用作模型材料，以评估溶液温度对孔形成动力学的影响。这种新颖的分析方法能够可视化材料表面性质随时间的变化，包括其表面积以及孔和韧带尺寸。发现该过程非常早期阶段的脱合金化动力学对于稳定的孔形成和稳定化都至关重要。SAXS原位数据与通过卢瑟福背散射和扫描电子显微镜从非原位样品获得的材料形态学性质相关联。
