Bimodal nanoporous structure shows great potential in a wide variety of applications. So far, however, a scalable fabrication method for bimodal nanoporous structure with controllable morphology and size remains a critical challenge. Herein, we prepare a homogeneously bimodal nanoporous copper which consists of nanoslit and nanopore through combined laser processing and dealloying. The nanoslit and nanopore size can be easily altered by simply controlling the laser processing parameters. With decreased heat input during laser processing, the width of nanoslit decreases from 200 nm to 100 nm and the average size of nanopore decreases from 23.7 to 14.0 nm. The bimodal nanoporous copper is found to be principally influenced by metallurgical reaction during laser-material interaction. Compared with equilibrium-solidified as-cast alloy, phase separation and refined microstructure induced by non-equilibrium solidification through laser processing facilitates corrosion rate during dealloying and induces bimodal nanoporous structure after dealloying.

双峰纳米多孔结构在各种应用中显示出巨大的潜力。然而，到目前为止，具有可控形态和尺寸的双峰纳米多孔结构的可扩展制造方法仍然是一个关键挑战。在此，我们通过联合激光加工和脱合金制备了由纳米狭缝和纳米孔组成的均匀双峰纳米多孔铜。通过简单地控制激光加工参数，可以很容易地改变纳米狭缝和纳米孔的尺寸。随着激光加工过程中热量输入的减少，纳米狭缝的宽度从 200 nm 减小到 100 nm，纳米孔的平均尺寸从 23.7 nm 减小到 14.0 nm。发现双峰纳米多孔铜主要受激光与材料相互作用期间的冶金反应的影响。与平衡凝固铸态合金相比，