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首页> 外文期刊>ACS applied materials & interfaces >Microcontact Printing of Thiol-Functionalized Ionic Liquid Microarrays for 'Membrane-less' and 'Spill-less' Gas Sensors
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Microcontact Printing of Thiol-Functionalized Ionic Liquid Microarrays for 'Membrane-less' and 'Spill-less' Gas Sensors

机译：硫醇官能化离子液体微阵列的微接触印刷，用于“无膜”和“无泄漏”气体传感器

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摘要

Lab-on-a-chip systems have gained significant interest for both chemical synthesis and assays at the micro-to-nanoscale with a unique set of benefits. However, solvent volatility represents one of the major hurdles to the reliability and reproducibility of the lab-on-a-chip devices for large-scale applications. Here we demonstrate a strategy of combining nonvolatile and functionalized ionic liquids with microcontact printing for fabrication of "wall-less" microreactors and microfluidics with high reproducibility and high throughput. A range of thiol-functionalized ionic liquids have been synthesized and used as inks for microcontact printing of ionic liquid microdroplet arrays onto gold chips. The covalent bonds formed between the thiol-functionalized ionic liquids and the gold substrate offer enhanced stability of the ionic liquid microdroplets, compared to conventional nonfunctionalized ionic liquids, and these microdroplets remain stable in a range of nonpolar and polar solvents, including water. We further demonstrate the use of these open ionic liquid microarrays for fabrication of "membrane-less" and "spill-less" gas sensors with enhanced reproducibility and robustness. Ionic-liquid-based microarray and microfluidics fabricated using the described microcontact printing may provide a versatile platform for a diverse number of applications at scale.
机译：芯片实验室系统对化学合成和微纳尺度的测定都产生了极大的兴趣，并具有独特的优势。但是，溶剂挥发性代表了大规模应用芯片实验室设备的可靠性和可重复性的主要障碍之一。在这里，我们演示了将非易失性和功能化离子液体与微接触印刷相结合的策略，以制造“无壁”微反应器和具有高重现性和高通量的微流体。已经合成了多种硫醇官能化的离子液体，并将其用作将离子液体微滴阵列微接触印刷到金芯片上的油墨。与常规的非官能化离子液体相比，硫醇官能化离子液体和金基质之间形成的共价键增强了离子液体微滴的稳定性，并且这些微滴在一定范围的非极性和极性溶剂（包括水）中保持稳定。我们进一步证明了这些开放的离子液体微阵列用于制造“无膜”和“无泄漏”气体传感器的方法，具有增强的重现性和耐用性。使用所述微接触印刷制造的基于离子液体的微阵列和微流体可以为大规模的多种应用提供通用平台。

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