Patterned assembly of colloidal particles by confined dewetting lithography
Patterned assembly of colloidal particles by confined dewetting lithography
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DOI：
10.1021/la062199k
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发表时间：
2006-12-19
期刊：
影响因子：
3.9
通讯作者：
Stevenson, Keith J.
中科院分区：
文献类型：
--
作者：
Celio, Hugo;Barton, Emily;Stevenson, Keith J.
我们报道了胶体颗粒在各种清洁和化学修饰的固体衬底上组装成受限排列和图案的方法，我们将这种方法称为“受限去湿光刻”，简称CDL。CDL的实验装置是一个简单的沉淀池，其中胶体颗粒(例如聚苯乙烯球)的水悬浮液被放置在浮动沉积模板(即金属微网)和固体衬底之间。沉积模板的空隙用作微米大小的水库的阵列，其中限制了几个流体动力学过程。这些过程包括水蒸发、弯月面形成、对流、破裂、去湿和毛细管桥的形成。以聚苯乙烯小球(直径4.5、2.0、1.7、0.11、0.064µm)、正方形和六边形沉积模板为模型系统，讨论了CDL高效沉积复杂图案胶粒的最佳条件。我们发现，当使用亚微米硫酸盐官能化的PS粒子时，CDL方法的优化条件主要取决于最小化吸引粒子与衬底的相互作用。本文描述的CDL方法提供了一种相对简单和快速的方法，通过选择合适的条件和材料，从水悬浮液中组装几乎任何几何图案，包括使用不同直径的PS颗粒组装的更复杂的图案。
We report the assembly of colloidal particles into confined arrangements and patterns on various cleaned and chemically modified solid substrates using a method which we term "confined dewetting lithography" or CDL for short. The experimental setup for CDL is a simple deposition cell where an aqueous suspension of colloidal particles (e. g., polystyrene spheres) is placed between a floating deposition template (i.e., metal microgrid) and the solid substrate. The voids of the deposition template serve as an array of micrometer-sized reservoirs where several hydrodynamic processes are confined. These processes include water evaporation, meniscus formation, convective flow, rupturing, dewetting, and capillary-bridge formation. We discuss the optimal conditions where the CDL has a high efficiency to deposit intricate patterns of colloidal particles using polystyrene spheres (PS; 4.5, 2.0, 1.7, 0.11, 0.064 mu m diameter) and square and hexagonal deposition templates as model systems. We find that the optimization conditions of the CDL method, when using submicrometer, sulfate-functionalized PS particles, are primarily dependent on minimizing attractive particle-substrate interactions. The CDL methodology described herein presents a relatively simple and rapid method to assemble virtually any geometric pattern, including more complex patterns assembled using PS particles with different diameters, from aqueous suspensions by choosing suitable conditions and materials.