Paper-Based Ion-Selective Potentiometric Sensors

被引:168
作者
Novell, Marta [1 ]
Parrilla, Marc [1 ]
Crespo, Gaston A. [1 ]
Xavier Rius, F. [1 ]
Andrade, Francisco J. [1 ]
机构
[1] Univ Rovira & Virgili, Dept Analyt & Organ Chem, Tarragona 43007, Spain
关键词
WALLED CARBON NANOTUBES; AMMONIUM IONOPHORE; HOME TELEHEALTH; ELECTRODES; DESIGN; DIAGNOSTICS; MANAGEMENT;
D O I
10.1021/ac202979j
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A new approach to develop ultra low-cost, robust, rugged, and disposable potentiometric sensors is presented. A suspension of carbon nanotubes in a water-surfactant mixture (carbon nanotubes ink) is applied on conventional filter papers to turn them into conductive papers, which are then used as a substrate to build ion-selective electrodes. The electrodes are made by drop casting a membrane on a small circular area of the conductive paper. In this way, the carbon nanotubes act as both electric conductors and ion-to-electron transducers of the potentiometric signal. Electrodes for sensing K+, NH4(+), and pH were built and tested using this approach, and the results were compared with classical solid-state ion selective electrodes using carbon nanotubes as transducers and glassy carbon as a substrate. In all cases, the analytical performance (sensitivity, linear ranges, limits of detection, selectivity, etc.) of these disposable paper electrodes was similar to that obtained for the more conventional type of ion-selective-electrodes. This opens new avenues for very low-cost platforms for generation of chemical information.
引用
收藏
页码:4695 / 4702
页数:8
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