Potentiometric strip cell based on carbon nanotubes as transducer layer: Toward low-cost decentralized measurements

Identifier:  imarina:6386778

Handle: https://hdl.handle.net/20.500.11797/imarina6386778

Authors:  Xavier Rius-Ruiz, F; Crespo, Gaston A; Bejarano-Nosas, Diego; Blondeau, Pascal; Riu, Jordi; Xavier Rius, F

Abstract:
In this study, we developed a potentiometric planar strip cell based on single-walled carbon nanotubes that aims to exploit the attributes of solid-contact ion-selective electrodes for decentralized measurements. That is, the ion-selective and reference electrodes have been simultaneously miniaturized onto a plastic planar substrate by screen-printing and drop-casting techniques, obtaining disposable strip cells with satisfactory performance characteristics (i.e., the sensitivity is 57.4 ± 1.3 mV/dec, the response time is ≥30 s within the linear range from log a K+ = -5 to -2, and the limit of detection is -6.5), no need of maintenance during long dry storage, quick signal stabilization, and light insensitivity in short-term measurements. We also show how the new potentiometric strip cell makes it possible to perform decentralized and rapid determinations of ions in real samples, such as saliva or beverages. © 2011 American Chemical Society.