Size dependence of effective Young's modulus of nanoporous gold
Size dependence of effective Young's modulus of nanoporous gold
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DOI：
10.1063/1.2436718
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发表时间：
2007-02-05
影响因子：
4
通讯作者：
Erlebacher, Jonah
中科院分区：
文献类型：
--
作者：
Mathur, Anant;Erlebacher, Jonah
纳米多孔金（Nanoporous gold，NPG）是由Au/Ag合金在酸溶液中脱合金而成的具有纳米级开孔的Au的脆性、三维、无规结构。在这项工作中，具有控制在3和40 nm之间的孔隙率变化的NPG的杨氏模量通过使用基于屈曲的方法对类似于100 nm厚的、独立的、大颗粒的、无应力的NPG膜进行机械测试来确定[C.斯塔福德，纳特。脱线。3，545（2005）]。结果表明，NPG的有效杨氏模量的急剧上升，韧带的尺寸减小，特别是低于10 nm，并讨论了这种行为的可能原因。
Nanoporous gold (NPG) is a brittle, three-dimensional, random structure of Au with nanometer scale open porosity that is made by dealloying Au/Ag alloys in acid. In this work, Young's modulus of NPG with controlled porosity variation between 3 and 40 nm is determined by mechanical testing of similar to 100 nm thick, free standing, large-grained, stress-free films of NPG using a buckling-based method [C. Stafford , Nat. Mater. 3, 545 (2005)]. Results showing a dramatic rise in the effective Young's modulus of NPG with decreasing ligament size, especially below 10 nm are presented, and possible reasons for this behavior are discussed.