Kandemir Ayse Cagil, Erdem Derya, Ma Huan, Reiser Alain, Spolenak Ralph
Laboratory for Nanometallurgy, ETH Zurich, Switzerland.
Nanotechnology. 2016 Apr 1;27(13):135303. doi: 10.1088/0957-4484/27/13/135303. Epub 2016 Feb 24.
The ultimate aim of this study is to construct polymer nanocomposite patterns by dip-pen nanolithography (DPN). Recent investigations have revealed the effect of the amount of ink (Laplace pressure) on the mechanism of liquid ink writing. In this study it is shown that not only the amount of ink, but also physisorption and surface diffusion are relevant. After a few writing steps, physisorption and surface diffusion outweigh the influence of the amount of ink, allowing consistent patterning governed by dwell times and writing speeds. Polymer matrices can be utilized as a delivery medium to deposit functional particles. DPN patterning of polymer nanocomposites allows for local tuning of the functionality and mechanical strength of the written patterns in high resolution, with the benefit of pattern flexibility. Typically polymer matrices with volatile components are used as a delivery medium for nanoparticle deposition, with subsequent removal of loosely bound matrix material by heating or oxygen plasma. In our study, nanocomposite patterns were constructed, and the differences between polymer and nanocomposite patterning were investigated. Cross-sectional SEM and TEM analysis confirmed that nanoparticles can be deposited with the liquid-polymer ink and are evenly distributed in the polymer matrix.
本研究的最终目的是通过蘸笔纳米光刻技术（DPN）构建聚合物纳米复合材料图案。最近的研究揭示了墨水量（拉普拉斯压力）对液体墨水书写机制的影响。在本研究中表明，不仅墨水量，而且物理吸附和表面扩散也很重要。经过几个书写步骤后，物理吸附和表面扩散超过了墨水量的影响，使得由驻留时间和书写速度控制的图案化过程能够保持一致。聚合物基质可以用作沉积功能颗粒的递送介质。聚合物纳米复合材料的DPN图案化能够以高分辨率对书写图案的功能和机械强度进行局部调节，具有图案灵活性的优点。通常，具有挥发性成分的聚合物基质用作纳米颗粒沉积的递送介质，随后通过加热或氧等离子体去除松散结合的基质材料。在我们的研究中，构建了纳米复合材料图案，并研究了聚合物图案化和纳米复合材料图案化之间的差异。横截面扫描电子显微镜（SEM）和透射电子显微镜（TEM）分析证实，纳米颗粒可以与液体聚合物墨水一起沉积，并均匀分布在聚合物基质中。
