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通过高反应性的含氟酸基功能化单层对无氧化物硅进行微接触印刷。

Microcontact printing onto oxide-free silicon via highly reactive acid fluoride-functionalized monolayers.

机构信息

Laboratory of Organic Chemistry, Wageningen University Dreijenplein 8, Wageningen, 6703 HB, The Netherlands.

出版信息

Small. 2010 Mar 8;6(5):642-50. doi: 10.1002/smll.200901650.

Abstract

This work describes a new route for patterning organic monolayers on oxide-free silicon by microcontact printing (microCP) on a preformed, reactive, acid-fluoride-terminated monolayer. This indirect printing approach is fast and easily preserves the oxide-free and well-defined monolayer-silicon interface, which is the most important property for potential applications in biosensing and molecular electronics. Water-contact-angle measurements, ellipsometry, attenuated total reflection infrared spectroscopy, and X-ray photoelectron spectroscopy (XPS) demonstrate the formation of the initial acid-fluoride-terminated monolayers without upside-down attachment. Subsequent printing for twenty seconds with an N-hexadecylamine-inked poly(dimethylsiloxane) stamp results in well-defined 5-microm N-hexadecylamide dots, as evidenced by atomic force microscopy and scanning electron microscopy. Printing with a flat stamp allows investigation of the efficiency of amide formation by microCP and water-contact-angle measurements, ellipsometry, and XPS reveal the quantitative conversion of the acid fluoride groups to the corresponding amide within twenty seconds. The absence of silicon oxide, even after immersion in water for 16 h, demonstrates that the oxide-free monolayer-silicon interface is easily preserved by this patterning route. Finally, it is shown by fluorescence microscopy that complex biomolecules, like functionalized oligo-DNA, can also be immobilized on the oxide-free silicon surface via microCP.

摘要

这项工作描述了一种在无氧化物的硅上通过微接触印刷(microCP)在预先形成的、反应性的、酸氟化物封端单层上对有机单层进行图案化的新途径。这种间接印刷方法快速且易于保留无氧化物和明确定义的单层-硅界面,这是在生物传感和分子电子学等潜在应用中最重要的特性。水接触角测量、椭圆光度法、衰减全反射红外光谱和 X 射线光电子能谱(XPS)证明了初始酸氟化物封端单层的形成,而没有倒置附着。随后用涂有 N-十六烷基胺的聚二甲基硅氧烷(PDMS)印章印刷二十秒,得到了定义良好的 5 微米 N-十六酰胺点,原子力显微镜和扫描电子显微镜证明了这一点。使用平面印章进行印刷可以研究酰胺形成的效率,水接触角测量、椭圆光度法和 XPS 揭示了在二十秒内酸氟化物基团定量转化为相应酰胺。即使在水中浸泡 16 小时后,仍未检测到氧化硅,这表明这种图案化方法可以轻松保留无氧化物的单层-硅界面。最后,荧光显微镜显示,复杂的生物分子,如功能化的寡 DNA,也可以通过 microCP 固定在无氧化物的硅表面上。

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