Bi-continuous pattern formation in thin films via solid-state interfacial dealloying studied by multimodal characterization
Bi-continuous pattern formation in thin films via solid-state interfacial dealloying studied by multimodal characterization
复制标题
通过多模态表征研究固态界面脱合金在薄膜中形成双连续图案
DOI：
10.1039/c9mh00669a
复制
发表时间：
2019
影响因子：
13.3
通讯作者：
Ravel, Bruce
中科院分区：
文献类型：
--
作者：
Zhao, Chonghang;Kisslinger, Kim;Huang, Xiaojing;Lu, Ming;Camino, Fernando;Lin, Cheng-Hung;Yan, Hanfei;Nazaretski, Evgeny;Chu, Yong;Ravel, Bruce
具有三维（3D）互连形态的双连续纳米结构材料在催化，生物医学传感和能量存储方面提供了独特的性能和潜在的应用。固态界面去合金化（SSID）的新方法为通过最小化系统自由能驱动的自组织过程在纳米/介观尺度上制备双连续金属-金属复合材料和多孔金属开辟了一条途径。将SSID和薄膜加工完全集成可以在设计新型功能材料方面开辟广泛的技术机会;迄今为止，没有实验证据表明可以用SSID形成3D双连续薄膜，这是由于薄膜几何形状和纳米尺度的动力学机制的复杂性，尽管SSID中的加工策略简单。在这里，我们证明了一个完全互连的三维双连续结构，可以通过这种新的方法，薄膜SSID，使用铁镍膜脱合金镁膜。Fe-MgxNi双连续3D纳米结构的形成通过多尺度、多模态方法进行可视化和表征，该方法将电子透射显微镜与同步加速器X射线荧光纳米断层扫描和吸收光谱相结合。与结构形成的现象进行了讨论。这些包括表面去湿，纳米尺寸的金属韧带之间的空隙形成，和与基板的相互作用。这项工作揭示了SSID过程的机制，并为未来纳米结构金属材料的薄膜材料的制造奠定了基础。
Bicontinuous-nanostructured materials with a three-dimensionally (3D) interconnected morphology offer unique properties and potential applications in catalysis, biomedical sensing and energy storage. The new approach of solid-state interfacial dealloying (SSID) opens a route for fabricating bi-continuous metal–metal composites and porous metals at nano-/meso-scales via a self-organizing process driven by minimizing the system's free energy. Integrating SSID and thin film processing fully can open up a wide range of technological opportunities in designing novel functional materials; to-date, no experimental evidence has shown that 3D bi-continuous films can be formed with SSID, owing to the complexity of the kinetic mechanisms in thin film geometry and at nano-scales, despite the simple processing strategy in SSID. Here, we demonstrate that a fully-interconnected 3D bi-continuous structure can be achieved by this new approach, thin-film-SSID, using Fe–Ni film dealloyed by Mg film. The formation of a Fe–MgxNi bi-continuous 3D nano-structure was visualized and characterized via a multi-scale, multi-modal approach, combining electron transmission microscopy with synchrotron X-ray fluorescence nano-tomography and absorption spectroscopy. Phenomena involved with structural formation are discussed. These include surface dewetting, nano-size void formation among metallic ligaments, and interaction with a substrate. This work sheds light on the mechanisms of the SSID process, and sets a path for manufacturing of thin-film materials for future nano-structured metallic materials.