Department of Applied Chemistry, Faculty of Science and Technology, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.
Electrochemistry and Optical Spectroscopy Research Unit (EOSRU), Department of Chemistry, Faculty of Science, Chulalongkorn University , Patumwan, Bangkok 10330, Thailand.
Anal Chem. 2017 Oct 3;89(19):10608-10616. doi: 10.1021/acs.analchem.7b03177. Epub 2017 Sep 11.
A fully inkjet-printed disposable and low cost paper-based device for potentiometric Na- or K-ion sensing has been developed. A printed ionophore-based all-solid-state ion selective electrode on a graphene/poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (G/PEDOT:PSS) nanocomposite solid contact and a printed all-solid state reference electrode consisting of a pseudosilver/silver chloride electrode coated by a lipophilic salt-incorporating poly(vinyl chloride) membrane overprinted with potassium chloride have been combined on a microfluidically patterned paper substrate. Devices are built on standard filter paper using off-the-shelf materials. Ion sensing has been achieved within 180 s by simple addition of 20 μL of sample solution without electrode preconditioning. The limits of detection were 32 and 101 μM for Na and K, respectively. The individual single-use sensing devices showed near Nernstian response of 62.5 ± 2.1 mV/decade (Na) and 62.9 ± 1.1 mV/decade (K) with excellent standard potential (E) reproducibilities of 455.7 ± 5.1 mV (Na) and 433.9 ± 2.8 mV (K). The current work demonstrates the promising possibility of obtaining low-cost and disposable paper-based potentiometric sensing devices potentially manufacturable at large scales with industrial inkjet printing technology.
已经开发出一种完全喷墨打印的一次性和低成本基于纸张的设备，用于测定电势钠离子或钾离子。在石墨烯/聚（3,4-亚乙基二氧噻吩）聚苯乙烯磺酸盐（G/PEDOT：PSS）纳米复合材料固体接触上印刷基于离子载体的全固态离子选择性电极，以及由涂有亲脂性盐的假银/氯化银电极组成的印刷全固态参比电极，该电极上覆盖有印有氯化钾的聚氯乙烯膜，已结合在微流控图案化的纸张基底上。使用标准滤纸和现成材料构建设备。通过简单地添加 20 μL 的样品溶液，无需电极预处理，在 180 s 内即可实现离子检测。Na 和 K 的检测限分别为 32 和 101 μM。单个一次性感应装置表现出近 Nernstian 响应，Na 为 62.5 ± 2.1 mV/decade，K 为 62.9 ± 1.1 mV/decade，标准电位（E）重现性极佳，Na 为 455.7 ± 5.1 mV，K 为 433.9 ± 2.8 mV。目前的工作表明，使用工业喷墨打印技术获得低成本、一次性基于纸张的电势传感装置具有很大的规模化生产潜力。
