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Screen-Printed Contactless Conductivity Detector for Microchip Capillary Electrophoresis

机译：用于微芯片毛细管电泳的丝网印刷非接触式电导检测器

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摘要

A new method for mass fabrication of silver ink conductivity detector electrodes for poly(methylmethacrylate) (PMMA) microchip electrophoretic systems has been developed based on screen-printing technology. Printing of silver conductivity electrodes was performed through a patterned stencil on thin PMMA sheets. Following the electrode fabrication. the PMMA sheets are cut into cover sheets, and are aligned and sealed to the channel plate thus establishing a complete microchip separation device. The effects of the electrode width and spacing on the response and resolution have been investigated and the optimized electrode performance was compared to commonly used aluminum electrodes in the determination of ammonium, methyl ammonium, and sodium. The utility of the screenprinted contactless conductivity detector (SPCCD) electrodes is further demonstrated for the separation and detection of organic acids with excellent reproducibility (RSD values of 3.7% and 4.1% for oxalate and tartrate, respectively). The thick-film fabrication of the electrode material demonstrates the ability to mass-fabricate detection devices with total process of device fabrication requiring less than 4 h (including the fabrication of channel plate, cover sheet with the electrodes, and subsequent bonding). The fabrication method described here is convenient and does not compromise the detector performance, hence offers great promise for producing single use field deployable analytical microsystems.
机译：基于丝网印刷技术，已经开发了一种大规模生产用于聚甲基丙烯酸甲酯（PMMA）微芯片电泳系统的银电导率检测器电极的新方法。银导电电极的印刷是通过图案化的模板在薄PMMA板上进行的。在电极制造之后。将PMMA片切成盖板，并对齐并密封到通道板上，从而建立完整的微芯片分离装置。研究了电极宽度和间距对响应和分辨率的影响，并将优化的电极性能与常用的铝电极进行了比较，以确定铵，甲基铵和钠。丝网印刷的非接触电导检测器（SPCCD）电极的实用性进一步证明了其具有优异的重现性（草酸盐和酒石酸盐的RSD值分别为3.7％和4.1％）用于分离和检测有机酸。电极材料的厚膜制造展示了能够大规模制造检测装置的能力，整个装置制造过程需要少于4小时（包括通道板，带有电极的覆盖板的制造以及随后的粘接）。这里描述的制造方法方便且不会损害检测器的性能，因此为生产一次性使用的现场可部署的分析微系统提供了广阔的前景。

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