Nanopatterning self-assembled nanoparticle superlattices by moulding microdroplets
Nanopatterning self-assembled nanoparticle superlattices by moulding microdroplets
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DOI：
10.1038/nnano.2008.279
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发表时间：
2008-11-01
影响因子：
38.3
通讯作者：
Luo, Dan
中科院分区：
文献类型：
--
作者：
Cheng, Wenlong;Park, Nokyoung;Luo, Dan
高度有序的纳米粒子阵列表现出许多在无序对应物中没有的性质。然而，这些纳米粒子超晶格通常形成在远离平衡的去湿过程中，这排除了使用常规的图案化方法，由于缺乏对局部去湿动力学的控制。在这里，我们报告了一种简单而有效的方法，图案化这样的超晶格，包括模塑含有纳米粒子的微滴和空间调节其去湿过程。这种方法可以提供合理的控制纳米粒子超晶格的局部成核和生长。使用DNA封端的金纳米粒子作为模型系统，我们已经在大面积上将纳米粒子超晶格图案化为具有高度内部有序性的多功能结构，包括单粒子宽度的微结构，单粒子厚度的微圆盘和亚微米尺寸的“超晶体”。值得注意的是，这些特征可以通过微图案化电极阵列来解决，这表明了自下而上纳米器件的潜在应用。
Highly ordered arrays of nanoparticles exhibit many properties that are not found in their disordered counterparts. However, these nanoparticle superlattices usually form in a far-from-equilibrium dewetting process, which precludes the use of conventional patterning methods owing to a lack of control over the local dewetting dynamics. Here, we report a simple yet efficient approach for patterning such superlattices that involves moulding microdroplets containing the nanoparticles and spatially regulating their dewetting process. This approach can provide rational control over the local nucleation and growth of the nanoparticle superlattices. Using DNA-capped gold nanoparticles as a model system, we have patterned nanoparticle superlattices over large areas into a number of versatile structures with high degrees of internal order, including single-particle-width corrals, single-particle-thickness microdiscs and submicrometre-sized 'supra-crystals'. Remarkably, these features could be addressed by micropatterned electrode arrays, suggesting potential applications in bottom-up nanodevices.