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Keywords = REFET, silylating

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12 pages, 190 KiB  
Article
Optimization of a PVC Membrane for Reference Field Effect Transistors
by Chao-Sung Lai, Cheng-En Lue, Chia-Ming Yang, Marek Dawgul and Dorota G. Pijanowska
Sensors 2009, 9(3), 2076-2087; https://doi.org/10.3390/s90302076 - 19 Mar 2009
Cited by 9 | Viewed by 13483
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 [...] Read more.
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. Full article
(This article belongs to the Section Biosensors)
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