Dual‐Scale Nanostructures via Evaporative Assembly,Advanced Materials Interfaces

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Dual‐Scale Nanostructures via Evaporative Assembly
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-02-28 , DOI: 10.1002/admi.201901954
Sunita Srivastava ₁ , Zaibudeen A. Wahith ₁ , Oleg Gang _{2,

3,

4} , Carlos E. Colosqui ₅ , Surita R. Bhatia ₆

Affiliation

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.

中文翻译：

通过蒸发组装的双尺度纳米结构

具有规则的微尺度图案和不同程度的纳米尺度晶序的双尺度分层结构是通过具有带电核壳的DNA功能化纳米颗粒（NP）悬浮液的蒸发自组装在物理和化学均质的基质上合成的。对于特定的NP浓度范围，在纳米尺度上由具有六边形晶格结构的NP单层在宏观表面积上产生条纹状微图案中的周期性同心环。可以通过改变NP浓度来控制条带的宽度，间距和纳米粒子的有序性。结果表明，液滴接触线的“粘滑”运动与库仑和空间NP相互作用之间的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说明实验观察结果，并指导未来不同纳米结构形态的设计。这项工作演示了一种简单，经济高效的无掩模方法，用于制造大面积纳米结构2D材料和超表面，其应用范围从能量转换/存储到光电和纳米光子学。

更新日期：2020-02-28

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