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Paper-Based Ion-Selective Potentiometric Sensors
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2012 (English)In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 84, no 11, 4695-4702 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2012. Vol. 84, no 11, 4695-4702 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-206924DOI: 10.1021/ac202979jISI: 000304783100010Scopus ID: 2-s2.0-84861898119OAI: oai:DiVA.org:kth-206924DiVA: diva2:1094359
Note

QC 20170522

Available from: 2017-05-09 Created: 2017-05-09 Last updated: 2017-05-22Bibliographically approved

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Crespo, Gaston A.
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