Hoffmann Julian, Gamboa Sofia Madrigal, Hofmann Andreas, Gliemann Hartmut, Welle Alexander, Wacker Irene, Schröder Rasmus R, Ness Len, Hagenmeyer Veit, Gengenbach Ulrich
Institute for Automation and Applied Informatics, Karlsruhe Institute of Technology, Hermannvon-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
Institute of Functional Interfaces and Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
Sci Rep. 2019 Nov 29;9(1):17952. doi: 10.1038/s41598-019-54507-1.
A novel method is demonstrated for ordered deposition of thin lamellar objects from a liquid environment onto solid substrates by solid/fluid/solid-driven organisation. Surface functionalisation forms a template pattern that accumulates the lamellar objects by site-selective wetting of the target area without the need for a physical fluid containment. Contrary to conventional handling methods, no mechanical contact occurs, which facilitates the ordered deposition without wrinkles or ruptures. An additive and a subtractive process for the creation of such templates are presented. The subtractive process starts with the complete silanisation of the substrate in the vapour phase followed by site-selective oxygen plasma treatment of the siloxane film. The additive process uses microcontact printing to transfer the target pattern. Both processes are characterised by optical inspection of the wetting contours and it is found that site-selective plasma treatment shows a better pattern fidelity. The patterns obtained by site-selective plasma treatment are also subject to ToF-SIMS analysis and show good chemical contrast between hydrophilic and hydrophobic areas. The ordered deposition of lamellar objects by this new method is demonstrated for 60 nm thick ultramicrotome sections of epoxide resin on pre-patterned glass substrates.
展示了一种通过固/液/固驱动组织将薄片状物体从液体环境有序沉积到固体基板上的新方法。表面功能化形成一种模板图案，该图案通过目标区域的位点选择性润湿来积累薄片状物体，而无需物理流体容纳。与传统处理方法相反，不会发生机械接触，这有利于有序沉积而不会产生皱纹或破裂。提出了用于创建此类模板的加法和减法工艺。减法工艺首先在气相中对基板进行完全硅烷化，然后对硅氧烷膜进行位点选择性氧等离子体处理。加法工艺使用微接触印刷来转移目标图案。这两种工艺都通过对润湿轮廓的光学检查来表征，并且发现位点选择性等离子体处理显示出更好的图案保真度。通过位点选择性等离子体处理获得的图案也进行了飞行时间二次离子质谱（ToF-SIMS）分析，并且在亲水和疏水区域之间显示出良好的化学对比度。通过这种新方法，在预图案化的玻璃基板上对环氧树脂的60纳米厚超薄切片进行了薄片状物体的有序沉积演示。
