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Optimization of a PVC Membrane for Reference Field Effect Transistors

Department of Electronic Engineering in Chang Gung University. / 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan, Taiwan, 333, R.O.C.
Device Section, Department of WAT and Devices, Inotera Memories Inc. / 667, Fuhsing 3rd Road, Hwa-Ya Technology Park, Kwei-Shan, Tao-Yuan, Taiwan. R.O. C.
Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences / ul. Trojdena 4, 02-109 Warsaw, Poland
Author to whom correspondence should be addressed.
Sensors 2009, 9(3), 2076-2087;
Received: 20 February 2009 / Revised: 9 March 2009 / Accepted: 12 March 2009 / Published: 19 March 2009
(This article belongs to the Section Biosensors)
PDF [190 KB, uploaded 21 June 2014]


For the miniaturization of ISFET sensing systems,the concept of a REFET with low ion sensitivity is proposed to replace the conventional reference electrodes through the arrangement of a quasi reference electrode and a differential readout circuit. In this study, an ion-unblocking membrane was used as the top layer of a REFET. To optimize the REFET performance, the influences of the silylating process, different plasticizers, and the composition of the PVC cocktails were investigated. A low sensitivity (10.4 ± 2.2 mV/pH) and high linearity (99.7 ± 0.3 %) in the range from pH 2.2 to pH 11.6 was obtained for the REFET with a 60˚wt.% DNP/(DNP + PVC) membrane. To evaluate the long term stability, the drift coefficient was estimated, and for the best REFET, it was –0.74 mV/h. Two criteria for assessing the lifetime of REFETs were used, namely the increase in pH sensitivity to a value higher than 15 mV/pH and the degradation of linearity below 99 %. For the best REFET, it was approximately 15 days. View Full-Text
Keywords: PVC membranes; ion-unblocking membranes; REFET; silylating; plasticizers PVC membranes; ion-unblocking membranes; REFET; silylating; plasticizers
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Lai, C.-S.; Lue, C.-E.; Yang, C.-M.; Dawgul, M.; Pijanowska, D.G. Optimization of a PVC Membrane for Reference Field Effect Transistors. Sensors 2009, 9, 2076-2087.

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