Synthesis, microstructure, and mechanical properties of polycrystalline Cu nano-foam
Synthesis, microstructure, and mechanical properties of polycrystalline Cu nano-foam
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DOI：
10.1557/adv.2018.128
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发表时间：
2018-01
期刊：
影响因子：
0.8
通讯作者：
C. E. Kim;R. M. Rahimi;N. Hightower;I. Mastorakos;D. Bahr
中科院分区：
文献类型：
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作者：
C. E. Kim;R. M. Rahimi;N. Hightower;I. Mastorakos;D. Bahr
以聚乙烯醇（PVA）和醋酸铜（Cu(Ac)_2）为原料，采用静电纺丝法制备了亚微米级多晶泡沫铜。报道了前驱体溶液电纺丝织物的热重测定。将前驱体织物在773K下氧化形成氧化物纳米泡沫；随后用还原性气体在573K温度下加热，将CuO纳米泡沫转化为具有相似韧带和中观孔径形态的Cu。通过聚焦离子束提升制备的截面显示出具有多尺度孔隙度的多晶结构。采用纳米压痕法测定了Cu纳米泡沫材料的力学性能。载荷-深度曲线和推导出的力学性能表明，在这种非常规的金属形式中，额外的韧带内孔隙导致了独特的结构-性能关系。
A polycrystalline Cu foam with sub-micron ligament sizes was formed by creating a non-woven fabric via electrospinning with a homogeneous mixture of polyvinyl alcohol(PVA)-and copper acetate(Cu(Ac)_2). Thermogravimetric measurement of the electrospun fabric of the precursor solution is reported. Oxidizing the precursor fabric at 773K formed an oxide nano-foam; subsequent heating at 573K with a reducing gas transformed the CuO nano-foam to Cu with a similar ligament and meso-scale pore size morphology. A cross-section prepared by focused ion beam lift-out shows the polycrystalline structure with multi-scale porosity. The mechanical property of the Cu nano-foam is measured by nano-indentation. The load-depth curves and deduced mechanical properties suggest that additional intra-ligament pores lead to unique structure-property relations in this non-conventional form of metal.