Dual‐Scale Nanostructures via Evaporative Assembly
Dual‐Scale Nanostructures via Evaporative Assembly
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DOI：
10.1002/admi.201901954
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发表时间：
2020-02
影响因子：
5.4
通讯作者：
S. Srivastava;Zaibudeen A. Wahith;O. Gang;C. Colosqui;S. Bhatia
中科院分区：
文献类型：
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作者：
S. Srivastava;Zaibudeen A. Wahith;O. Gang;C. Colosqui;S. Bhatia
利用带有带电核壳的DNA功能化纳米颗粒悬浮蒸发自组装的方法，在物理和化学均一的衬底上合成了具有规则微米级图案和不同程度纳米级晶序的双尺度层次化结构。在一定的NP浓度范围内，纳米尺度的六方晶格结构的NP单层在宏观表面积上形成条状微图案的周期性同心环。通过改变纳米粒子的浓度可以控制条纹的宽度、间距和纳米颗粒的有序性。结果表明，液滴接触线的“粘滑”运动与库仑和空间NP相互作用控制着观察到的结构的形成。提出了一个简单的分析模型来解释实验观察，并指导未来不同形貌的纳米结构的设计。这项工作展示了一种简单、经济、无掩膜的方法来制备大面积纳米结构2D材料和亚表面，应用范围从能量转换/存储到光电子学和纳米光子学。
Dual‐scale hierarchical structures with regular microscale patterns and varying degree of nanoscale crystalline order are synthesized on physically and chemically homogeneous substrates by evaporative self‐assembly with a suspension of DNA‐functionalized nanoparticles (NPs) with a charged core shell. For a certain NP concentration range, periodic concentric rings in a stripe‐like micropattern are produced over macroscale surface areas by an NP monolayer with hexagonal lattice structure at the nanoscale. The stripe width, spacing, and nanoparticle ordering can be controlled by varying the NP concentration. The results indicate that the interplay between “stick‐slip” motion of the droplet contact line and coulombic and steric NP interactions control the formation of the observed structures. A simple analytical model is proposed to account for the experimental observations and guide the future design of different nanostructure morphologies. This work demonstrates a simple cost‐effective mask‐free method for fabricating large‐area nanostructured 2D materials and metasurfaces for applications ranging from energy conversion/storage to optoelectronics and nanophotonics.