School of Electrical, Electronic and Computer Engineering, The University of Western Australia, 35 Stirling Hwy., Perth, WA 6009, Australia; Department of Engineering, Macquarie University, NSW 2109, Australia.
School of Molecular Sciences, The University of Western Australia, 35 Stirling Hwy., Perth, WA 6009, Australia; CSIRO Energy Flagship, Kensington, WA 6151, Australia.
Anal Chim Acta. 2017 Sep 22;987:105-110. doi: 10.1016/j.aca.2017.07.066. Epub 2017 Aug 7.
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, Ca. The sensors exhibited stable and rapid responses when introduced to various concentrations of Ca. 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 M, and a linear response range between 10-10 M. Also, detection limits of less than 10 M were achieved for the sensors in both 0.01 M MgCl and 0.01 M LiCl buffer solutions. AlGaN/GaN-based devices for Ca 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.
我们展示了用于钙离子检测的高选择性和高灵敏度的电位离子传感器，无需使用参比电极。这些传感器由 AlGaN/GaN 异质结构晶体管器件组成，通过化学功能化门区域，使用对钙离子具有高选择性的基于聚氯乙烯 (PVC) 的膜，Ca。当引入不同浓度的 Ca 时，传感器表现出稳定和快速的响应。在 0.01 M KCl 和 0.01 M NaCl 离子强度缓冲溶液中，传感器表现出接近 Nernstian 的响应，检测限低于 10 M，线性响应范围在 10-10 M 之间。此外，在 0.01 M MgCl 和 0.01 M LiCl 缓冲溶液中，传感器的检测限也低于 10 M。用于 Ca 检测的 AlGaN/GaN 基器件对各种应用表现出优异的选择性和响应范围。这项工作代表了使用离子选择性场效应晶体管 (ISFET) 器件阵列进行多离子传感的重要一步。
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