Paper-Based Ion-Selective Potentiometric Sensors

Citations Over TimeTop 1% of 2012 papers

Abstract

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(+), NH(4)(+), 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.

Related Papers

• → New Potentiometric Electronic Tongue for Analysing Teas and Infusions(2015)15 cited
• → The EMOSFET as a potentiometric transducer in an oxygen sensor(1998)13 cited
• → Potentiometric sensors(1998)2 cited
• → Solid‐State Electrochemical Potentiometric Sensors for Gas Analysis(1991)18 cited
• → Solid‐State Electrochemical Potentiometric Sensors for Gas Analysis(1995)