Wang Xuepu, Sperling Marcel, Reifarth Martin, Böker Alexander
Fraunhofer Institute for Applied Polymer Research IAP, D-14476, Potsdam-Golm, Germany.
Chair of Polymer Materials and Polymer Technologies, University of Potsdam, D-14476, Potsdam-Golm, Germany.
Small. 2020 Mar;16(11):e1906721. doi: 10.1002/smll.201906721. Epub 2020 Feb 24.
A method for the fabrication of well-defined metallic nanostructures is presented here in a simple and straightforward fashion. As an alternative to lithographic techniques, this routine employs microcontact printing utilizing wrinkled stamps, which are prepared from polydimethylsiloxane (PDMS), and includes the formation of hydrophobic stripe patterns on a substrate via the transfer of oligomeric PDMS. Subsequent backfilling of the interspaces between these stripes with a hydroxyl-functional poly(2-vinyl pyridine) then provides the basic pattern for the deposition of citrate-stabilized gold nanoparticles promoted by electrostatic interaction. The resulting metallic nanostripes can be further customized by peeling off particles in a second microcontact printing step, which employs poly(ethylene imine) surface-decorated wrinkled stamps, to form nanolattices. Due to the independent adjustability of the period dimensions of the wrinkled stamps and stamp orientation with respect to the substrate, particle arrays on the (sub)micro-scale with various kinds of geometries are accessible in a straightforward fashion. This work provides an alternative, cost-effective, and scalable surface-patterning technique to fabricate nanolattice structures applicable to multiple types of functional nanoparticles. Being a top-down method, this process could be readily implemented into, e.g., the fabrication of optical and sensing devices on a large scale.
本文以简单直接的方式介绍了一种制备结构明确的金属纳米结构的方法。作为光刻技术的替代方法，该方法采用微接触印刷，利用由聚二甲基硅氧烷（PDMS）制备的皱纹印章，并通过低聚PDMS的转移在基板上形成疏水条纹图案。随后用羟基官能化的聚（2-乙烯基吡啶）回填这些条纹之间的间隙，为通过静电相互作用促进柠檬酸盐稳定的金纳米颗粒的沉积提供基本图案。通过在第二步微接触印刷中剥离颗粒，可以进一步定制所得的金属纳米条纹，该步骤采用聚（乙烯亚胺）表面修饰的皱纹印章，以形成纳米晶格。由于皱纹印章的周期尺寸和印章相对于基板的取向具有独立的可调性，因此可以直接获得具有各种几何形状的（亚）微米级颗粒阵列。这项工作提供了一种替代的、具有成本效益的且可扩展的表面图案化技术，用于制造适用于多种功能纳米颗粒的纳米晶格结构。作为一种自上而下的方法，该工艺可以很容易地应用于大规模制造光学和传感设备等领域。
