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Abstract
We demonstrate highly selective and sensitive potentiometric ion sensors for calcium ion detection, operated without the use of a reference electrode. The sensors consist of AlGaN/GaN heterostructure-based transistor devices with chemical functionalisation of the gate area using poly (vinylchloride)-based (PVC) membranes having high selectivity towards calcium ions, Ca2+. The sensors exhibited stable and rapid responses when introduced to various concentrations of Ca2+. In both 0.01 M KCl and 0.01 M NaCl ionic strength buffer solutions, the sensors exhibited near Nernstian responses with detection limits of less than 10-7 M, and a linear response range between 10-7-10-2 M. Also, detection limits of less than 10-6 M were achieved for the sensors in both 0.01 M MgCl2 and 0.01 M LiCl buffer solutions. AlGaN/GaN-based devices for Ca2+ detection demonstrate excellent selectivity and response range for a wide variety of applications. This work represents an important step towards multi-ion sensing using arrays of ion-selective field effect transistor (ISFET) devices.
Original language | English |
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Pages (from-to) | 105-110 |
Number of pages | 6 |
Journal | Analytica Chimica Acta |
Volume | 987 |
DOIs | |
Publication status | Published - 22 Sept 2017 |
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Dive into the research topics of 'Ca2+ detection utilising AlGaN/GaN transistors with ion-selective polymer membranes'. Together they form a unique fingerprint.Projects
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Transistor-based sensor technology for fast, reliable and accurate in situ monitoring of recycled wastewater.
Parish, G. (Investigator 01), Nener, B. (Investigator 02), Baker, M. (Investigator 03), Myers, M. (Investigator 04) & Mishra, U. (Investigator 05)
ARC Australian Research Council
1/01/14 → 30/06/17
Project: Research