Optimization of a PVC Membrane for Reference Field Effect Transistors
AbstractFor 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
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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.
Lai C-S, Lue C-E, Yang C-M, Dawgul M, Pijanowska DG. Optimization of a PVC Membrane for Reference Field Effect Transistors. Sensors. 2009; 9(3):2076-2087.Chicago/Turabian Style
Lai, Chao-Sung; Lue, Cheng-En; Yang, Chia-Ming; Dawgul, Marek; Pijanowska, Dorota G. 2009. "Optimization of a PVC Membrane for Reference Field Effect Transistors." Sensors 9, no. 3: 2076-2087.