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Title
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Paper-based ion-selective potentiometric sensors
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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Analytical chemistry. - Washington, D.C., 1948, currens
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Publication
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Washington, D.C.
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2012
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ISSN
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0003-2700
[print]
5206-882X
[online]
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DOI
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10.1021/AC202979J
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Volume/pages
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84
:11
(2012)
, p. 4695-4702
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ISI
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000304783100010
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Pubmed ID
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22524243
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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