Three-dimensional nanoporous copper with high surface area by dealloying Mg–Cu–Y metallic glasses
Three-dimensional nanoporous copper with high surface area by dealloying Mg–Cu–Y metallic glasses
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DOI：
10.1016/j.matlet.2012.02.028
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发表时间：
2012-06
影响因子：
3
通讯作者：
Xuekun Luo;Ran Li;Zengqian Liu;Lu Huang;Minjie Shi;Tao Xu;Tao Zhang
中科院分区：
文献类型：
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作者：
Xuekun Luo;Ran Li;Zengqian Liu;Lu Huang;Minjie Shi;Tao Xu;Tao Zhang
采用化学脱合金的方法在硫酸溶液中制备了具有开孔结构的均匀三维纳米多孔铜（NPC）。Mg 50 Cu 40 Y10非晶合金脱合金后的NPC具有较高的比表面积（12.27m2/g），这是由于在纳米带表面形成了尺寸为30- 60 nm的相互连通的纳米孔和尺寸为3- 8 nm的纳米颗粒堆积所致。结果表明，当前NPC的主要形成机制是Mg和Y元素在非晶合金中的快速溶解以及Cu原子通过合金/溶液界面扩散形成的Cu团簇的形核和长大。具有较大比表面积和适当导热系数的NPC有望成为低温换热器材料。
Uniform three-dimensional nanoporous copper (NPC) with open pores was synthesized by chemically dealloying Mg–Cu–Y metallic glasses in H2SO4aqueous solution. The NPC dealloyed from Mg50Cu40Y10glassy alloy exhibits high Brunauer–Emmett–Teller (BET) surface area (12.27m2/g), which is attributed to the formation of interconnective nanopores with size of 30–60nm and accumulative nanoparticles with size of 3–8nm on the surface of ligaments. The results reveal that the main forming mechanism of current NPC is fast dissolution of Mg and Y elements in the glassy alloys coupled with nucleation and growth of Cu clusters via the alloy/solution interface diffusion of Cu atoms. The NPC with large specific surface area and proper thermal conductivity is expected to be low-temperature heat exchanger materials.