TY - JOUR
T1 - Ca2+ detection utilising AlGaN/GaN transistors with ion-selective polymer membranes
AU - Asadnia, Mohsen
AU - Myers, Matthew
AU - Umana-Membreno, Gilberto A.
AU - Sanders, Tarun M.
AU - Mishra, Umesh K.
AU - Nener, Brett D.
AU - Baker, Murray V.
AU - Parish, Giacinta
PY - 2017/9/22
Y1 - 2017/9/22
N2 - 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.
AB - 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.
KW - AlGaN/GaN
KW - Calcium detection
KW - Chemical sensor
KW - Ion selective field effect transistor
UR - http://www.scopus.com/inward/record.url?scp=85028328093&partnerID=8YFLogxK
UR - https://ulrichsweb.serialssolutions.com/title/1505866415547/30250
U2 - 10.1016/j.aca.2017.07.066
DO - 10.1016/j.aca.2017.07.066
M3 - Article
C2 - 28916033
AN - SCOPUS:85028328093
VL - 987
SP - 105
EP - 110
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
SN - 0003-2670
ER -