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1

Department of Electronic Engineering in Chang Gung University. - 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan, Taiwan, 333, R.O.C.

2

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.

3

Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences - ul. Trojdena 4, 02-109 Warsaw, Poland





*

Author to whom correspondence should be addressed.



Abstract 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





Autor: Chao-Sung Lai 1,* , Cheng-En Lue 1, Chia-Ming Yang 2, Marek Dawgul 3 and Dorota G. Pijanowska 3

Fuente: http://mdpi.com/



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