Elastic membranes of close-packed nanoparticle arrays
Elastic membranes of close-packed nanoparticle arrays
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DOI：
10.1038/nmat1965
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发表时间：
2007-09-01
期刊：
影响因子：
41.2
通讯作者：
Jaeger, Heinrich M.
中科院分区：
文献类型：
--
作者：
Mueggenburg, Klara E.;Lin, Xiao-Min;Jaeger, Heinrich M.
纳米粒子超晶格是由紧密堆积的无机粒子通过短的有机间隔物组成的杂化材料。到目前为止，大多数工作都集中在这些系统的独特的电子，光学和磁性行为（1-5）。在这里，我们证明了它们也具有显着的机械性能。我们专注于紧密堆积的纳米颗粒（6，7）的二维阵列，并表明它们可以在微米大小的孔中拉伸。所得的独立式单层膜延伸超过数百个粒径，而没有配体的交联或进一步嵌入聚合物中。为了表征膜，我们用力显微镜测量弹性性能，并使用透射电子显微镜确定阵列结构。对于十二硫醇连接的6纳米直径的金纳米单分子膜，我们发现一个杨氏模量的几个GPa的顺序。这种卓越的强度与高柔韧性相结合，使薄膜在边缘覆盖时能够轻松弯曲。阵列保持完整，能够承受高达370 K左右的温度的拉伸应力。这些薄膜的纯弹性响应，加上在高温下的出色鲁棒性和弹性，使它们成为广泛传感器应用的优秀候选者。
Nanoparticle superlattices are hybrid materials composed of close-packed inorganic particles separated by short organic spacers. Most work so far has concentrated on the unique electronic, optical and magnetic behaviour of these systems(1-5). Here, we demonstrate that they also possess remarkable mechanical properties. We focus on two-dimensional arrays of close-packed nanoparticles(6,7) and show that they can be stretched across micrometre-size holes. The resulting freestanding monolayer membranes extend over hundreds of particle diameters without crosslinking of the ligands or further embedding in polymer. To characterize the membranes we measured elastic properties with force microscopy and determined the array structure using transmission electron microscopy. For dodecanethiol-ligated 6-nm-diameter gold nanocrystal monolayers, we find a Young's modulus of the order of several GPa. This remarkable strength is coupled with high flexibility, enabling the membranes to bend easily while draping over edges. The arrays remain intact and able to withstand tensile stresses up to temperatures around 370 K. The purely elastic response of these ultrathin membranes, coupled with exceptional robustness and resilience at high temperatures should make them excellent candidates for a wide range of sensor applications.