Hybrid nanocolloids with programmed three-dimensional shape and material composition
Hybrid nanocolloids with programmed three-dimensional shape and material composition
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DOI：
10.1038/nmat3685
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发表时间：
2013-09-01
期刊：
影响因子：
41.2
通讯作者：
Fischer, Peer
中科院分区：
文献类型：
--
作者：
Mark, Andrew G.;Gibbs, John G.;Fischer, Peer
调节一种材料的光学（1,2）、电磁（3,4）和机械性能需要同时控制其成分和形状（5）。对于纳米尺度的复杂结构来说，这尤其具有挑战性，因为表面能最小化通常会导致小结构具有高度对称性（5）。在此，我们将低温阴影沉积与纳米尺度图案化相结合，实现了具有各向异性三维形状、特征尺寸小至20纳米且材料选择广泛的纳米胶体。我们通过生长具有尽可能低对称性的包含多种功能材料的三维混合纳米结构，以及制造数千亿个等离子体纳米螺旋（我们将其用作具有创纪录的圆二色性和可调手性光学性质的手性超流体），展示了这种制造方案的多功能性。
Tuning the optical(1,2), electromagnetic(3,4) and mechanical properties of a material requires simultaneous control over its composition and shape(5). This is particularly challenging for complex structures at the nanoscale because surface-energy minimization generally causes small structures to be highly symmetric(5). Here we combine low-temperature shadow deposition with nanoscale patterning to realize nanocolloids with anisotropic three-dimensional shapes, feature sizes down to 20 nm and a wide choice of materials. We demonstrate the versatility of the fabrication scheme by growing three-dimensional hybrid nanostructures that contain several functional materials with the lowest possible symmetry, and by fabricating hundreds of billions of plasmonic nanohelices, which we use as chiral metafluids with record circular dichroism and tunable chiroptical properties.