Shape-dependent ordering of gold nanocrystals into large-scale superlattices.
Shape-dependent ordering of gold nanocrystals into large-scale superlattices.
复制标题
金纳米晶体依形状有序排列成大尺度超晶格
DOI：
10.1038/ncomms14038
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发表时间：
2017-01-19
影响因子：
16.6
通讯作者：
Tang Z
中科院分区：
文献类型：
--
作者：
Gong J;Newman RS;Engel M;Zhao M;Bian F;Glotzer SC;Tang Z
将单个构建块自组装成高度有序的结构，类似于原子自发生长的晶体，是实现纳米晶体集体特性的一种很有前途的方法。然而，可靠地生产宏观组件的能力是不可用的，决定组件质量/良率的关键因素也不清楚。在这里，我们报告了高度有序的超晶格薄膜的形成，单晶域在二维上可达半毫米，厚度可达几微米，直径为数十纳米的纳米晶体。结合实验和计算结果，我们研究了由纳米晶体沉积和最终溶剂蒸发引起的从无序悬浮液到大规模有序超晶格的整个自组装过程。我们的研究结果表明，超晶格的最终相干长度在很大程度上取决于纳米晶体的形状。详细探讨了抑制高质量大尺度超晶格形成的因素。
Self-assembly of individual building blocks into highly ordered structures, analogous to spontaneous growth of crystals from atoms, is a promising approach to realize the collective properties of nanocrystals. Yet the ability to reliably produce macroscopic assemblies is unavailable and key factors determining assembly quality/yield are not understood. Here we report the formation of highly ordered superlattice films, with single crystalline domains of up to half a millimetre in two dimensions and thickness of up to several microns from nanocrystals with tens of nanometres in diameter. Combining experimental and computational results for gold nanocrystals in the shapes of spheres, cubes, octahedra and rhombic dodecahedra, we investigate the entire self-assembly process from disordered suspensions to large-scale ordered superlattices induced by nanocrystal sedimentation and eventual solvent evaporation. Our findings reveal that the ultimate coherence length of superlattices strongly depends on nanocrystal shape. Factors inhibiting the formation of high-quality large-scale superlattices are explored in detail.