School of Manufacturing Science and Engineering, Sichuan University, Chengdu, 610065, China.
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Sci Rep. 2018 Jan 11;8(1):447. doi: 10.1038/s41598-017-18795-9.
Micromorphology and atomic arrangement on ligament surface of nanoporous metals play a vital role in maintaining the structural stability, adjusting the reaction interface and endowing the functionality. Here we offer an instructive scientific understanding for temperature-induced surface reconstruction and interface structure evolution on ligament of nanoporous copper (NPC) based on systematically experimental observations and theoretical calculations. The results show that with dealloying temperature increasing, ligament surface micromorphology of NPC evolves from smooth to irregularity and to uniformly compressed semisphere, and finally to dispersed single-crystal nanoparticles accompanying with significant changes of interface structure from coherence to semi-coherence and to noncoherence. It can guide us to impart multifunctionality and enhanced reaction activity to porous materials just through surface self-modification of homogeneous atoms rather than external invasion of heteroatoms that may bring about unexpected ill effects, such as shortened operation life owing to poisoning.
纳米多孔金属的韧带表面的微观形貌和原子排列对维持结构稳定性、调节反应界面和赋予功能起着至关重要的作用。在这里，我们通过系统的实验观察和理论计算，为纳米多孔铜（NPC）的韧带表面在温度诱导下的表面重构和界面结构演变提供了有益的科学认识。结果表明，随着脱合金温度的升高，NPC 的韧带表面微观形貌从光滑到不规则，再到均匀压缩的半球体，最后到分散的单晶纳米颗粒，同时界面结构也从完全相干到半相干，再到非相干发生显著变化。这可以引导我们通过均匀原子的表面自修饰来赋予多孔材料多功能性和增强的反应活性，而不是通过外部侵入杂原子来实现，这可能会带来意想不到的负面影响，例如由于中毒而导致的操作寿命缩短。
