Department of Chemistry, National and Kapodistrian University of Athens, 15771 Athens, Greece.
Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece.
Sensors (Basel). 2021 Oct 18;21(20):6908. doi: 10.3390/s21206908.
This work reports the fabrication of integrated electrochemical fluidic paper-based analytical devices (ePADs) using a marker pen drawing and screen-printing. Electrodes were deposited on paper using screen-printing with conductive carbon ink. Then, the desired fluidic patterns were formed on the paper substrate by drawing with a commercial hydrophobic marker pen using an inexpensive computer-controlled x-y plotter. The working electrode was characterized by cyclic voltammetry and scanning electron microscopy. The analytical utility of the electrochemical PADs is demonstrated through electrochemical determination of Pb(II) and Cd(II) by anodic stripping voltammetry. For this purpose, the sample was mixed with a buffer solution and a Bi(III) solution, applied to the test zone of the PAD, the metals were preconcentrated as a bismuth alloy on the electrode surface and oxidized by applying an anodic potential scan. The proposed manufacturing approach enables the large-scale fabrication of fit-for-purpose disposable PADs at low cost which can be used for rapid on-site environmental monitoring.
本文报告了使用标记笔绘图和丝网印刷技术制造集成电化学流体纸基分析器件 (ePAD) 的方法。通过使用导电碳墨的丝网印刷在纸张上沉积电极，然后使用廉价的计算机控制的 x-y 绘图仪使用商业疏水性标记笔在纸张基底上绘制所需的流体图案。通过循环伏安法和扫描电子显微镜对工作电极进行了表征。通过阳极溶出伏安法电化学测定 Pb(II) 和 Cd(II) 来证明电化学 PAD 的分析实用性。为此，将样品与缓冲溶液和 Bi(III)溶液混合，施加到 PAD 的测试区域，将金属作为铋合金在电极表面上预浓缩，并通过施加阳极电势扫描进行氧化。所提出的制造方法能够以低成本大规模制造适合用途的一次性 PAD，可用于快速现场环境监测。
