去合金化工艺对纳米多孔铜纯度的影响

采用腐蚀去合金化方法制备纳米多孔铜材料。研究了固溶时间、腐蚀时间及腐蚀温度对纳米多孔铜表面形貌及残余Mn含量的影响。研究表明:由于固溶时间的延长，合金成分越来越均匀化，去合金化后所得纳米多孔铜的残余Mn原子分数降低。固溶95 h的前驱体合金，随着腐蚀时间的延长，其残余Mn含量降低不明显；随着温度的升高，其残余Mn原子分数由25 ℃的3.54%降至60℃的1.14%，但是60 ℃腐蚀后的孔隙与丝径尺寸明显粗化，样品易碎。通过调整去合金化参数，实验所制备的纳米多孔铜呈现均匀的海绵状纳米多孔结构，残余Mn原子分数1.23%, 平均丝径尺寸40 nm。

Effect of dealloying process on purity of nanoporous copper

Nanoporous Cu is synthesized by dealloying Mn-Cu precursors with the selective corrosion. The effects of time of heat treatment，the corrosion time and the temperature of dealloying on the porous morphology and the residual Mn content are investigated. It is revealed that the heat treatment can drive the composition to distribute homogeneously in the bulk alloy with increasing the time and consequently results in more fully dealloying for forming nanoporous Cu. There is no distinct decrease of the residual Mn content in the nanoporous Cu made from 95 h-heat-treated precursors with increasing the corrosion time. The residual Mn content in nanoporous Cu decreases from 3.54% at 25 ℃ corrosion temperature to 1.14% at 60 ℃ corrosion temperature. But the pore and the ligament sizes of the samples obviously coarsen after60 ℃ corrosion of the samples, and the samples are frangible. The resultant nanoporous copper possesses uniform porous structure in the three-dimensional network, with the residual Mn content of 1.23% and the average pore size of 40 nm.