Sadhu Veera Bhadraiah, Perl Andras, Péter Maria, Rozkiewicz Dorota I, Engbers Gerard, Ravoo Bart Jan, Reinhoudt David N, Huskens Jurriaan
Laboratories of Supramolecular Chemistry and Technology & Molecular Nanofabrication, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Langmuir. 2007 Jun 5;23(12):6850-5. doi: 10.1021/la063657s. Epub 2007 May 5.
Chemical modification of the surface of a stamp used for microcontact printing (microCP) is interesting for controling the surface properties, such as the hydrophilicity. To print polar inks, plasma polymerization of allylamine (PPAA) was employed to render the surface of poly(dimethylsiloxane) (PDMS), polyolefin plastomers (POP), and Kraton elatomeric stamps hydrophilic for long periods of time. A thin PPAA film of about 5 nm was deposited on the stamps, which increased the hydrophilicity, and which remained stable for at least several months. These surface-modified stamps were used to transfer polar inks by microCP. The employed microCP schemes are as follows: (a) a second generation of dendritic ink having eight dialkyl sulfide end groups to fabricate patterns on gold substrates by positive microCP, (b) fluorescent guest molecules on beta-cyclodextrin (beta-CD) printboards on glass employing host-guest recognition, and (c) Lucifer Yellow ethylenediamine resulting in covalent patterning on an aldehyde-terminated glass surface. All experiments resulted in an excellent performance of all three PPAA-coated stamp materials to transfer the polar inks from the stamp surface to gold and glass substrates by microCP, even from aqueous solutions.
对用于微接触印刷（microCP）的印章表面进行化学修饰，对于控制表面性质（如亲水性）而言很有意义。为了印刷极性油墨，采用烯丙胺的等离子体聚合（PPAA）使聚二甲基硅氧烷（PDMS）、聚烯烃塑性体（POP）和克拉通弹性印章的表面长时间保持亲水性。在印章上沉积了一层约5纳米厚的PPAA薄膜，这增加了亲水性，并且至少能稳定保持几个月。这些表面改性的印章用于通过微接触印刷转移极性油墨。所采用的微接触印刷方案如下：（a）具有八个二烷基硫醚端基的第二代树枝状油墨，通过正微接触印刷在金基板上制作图案；（b）在玻璃上的β-环糊精（β-CD）印刷板上利用主客体识别作用印刷荧光客体分子；（c）荧光素黄乙二胺在醛基封端的玻璃表面上形成共价图案。所有实验均表明，这三种涂覆有PPAA的印章材料在通过微接触印刷将极性油墨从印章表面转移到金和玻璃基板上时，甚至是从水溶液中转移时，都具有出色的性能。
