Water-Gated Transistor Using Ion Exchange Resin for Potentiometric Fluoride Sensing
| Autor: | Mark D. Ogden, Martin Grell, Zahrah Alqahtani, Robert Dawson, Nawal Alghamdi, Alastair Buckely, Thomas J. Robshaw |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Mechanical engineering and machinery
Potentiometric titration Inorganic chemistry chemistry.chemical_element 02 engineering and technology ion exchange 010402 general chemistry 01 natural sciences Mordenite Article chemistry.chemical_compound sensor lcsh:TJ1-1570 Electrical and Electronic Engineering Ion-exchange resin Detection limit Ion exchange fluoride Chemistry Mechanical Engineering technology industry and agriculture 021001 nanoscience & nanotechnology 0104 chemical sciences WGTFT Membrane Control and Systems Engineering Puromet 0210 nano-technology Fluoride Palladium |
| Zdroj: | Micromachines Volume 11 Issue 10 Micromachines, Vol 11, Iss 923, p 923 (2020) |
| ISSN: | 2072-666X |
| DOI: | 10.3390/mi11100923 |
| Popis: | We introduce fluoride-selective anion exchange resin sorbents as sensitisers into membranes for water-gated field effect transistors (WGTFTs). Sorbents were prepared via metal (La or Al)-loading of a commercial macroporous aminophosphonic acid resin, PurometTM MTS9501, and were filled into a plasticised poly(vinyl chloride) (PVC) phase transfer membrane. We found a potentiometric response (membrane potential leading to WGTFT threshold shift) to fluoride following a Langmuir&ndash Freundlich (LF) adsorption isotherm with saturated membrane potential up to ~480 mV, extremely low characteristic concentration c1/2 = 1/K, and picomolar limit of detection (LoD), even though ion exchange did not build up charge on the resin. La-loading gave a superior response compared to Al-loading. Membrane potential characteristics were distinctly different from charge accumulating sensitisers (e.g., organic macrocycles) but similar to the Cs+ (cation) selective ion-exchanging zeolite mineral &lsquo mordenite&rsquo We propose a mechanism for the observed threshold shift and investigate interference from co-solutes. Strong interference from carbonate was brought under control by &lsquo diluting&rsquo metal loading in the resin. This work sets a template for future studies using an entirely new &lsquo family&rsquo of sensitisers in applications where very low limit of detection is essential such as for ions of arsenic, mercury, copper, palladium, and gold. |
| Databáze: | OpenAIRE |
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