TY - JOUR
T1 - Reference field effect transistor based on chemically modified ISFETs
AU - Skowronska-Ptasinska, Maria
AU - van der Wal, Peter D.
AU - van den Berg, Albert
AU - Bergveld, Piet
AU - Sudholter, Ernst J.R.
AU - Reinhoudt, David N.
PY - 1990
Y1 - 1990
N2 - Different hydrophobic polymers were used for chemical modification of ion-sensitive field effect transistors (ISFETs) in order to prepare a reference FET (REFET). Chemical attachment of the polymer to the ISFET gate results in a long lifetime of the device. Properties of polyacrylate (polyACE) REFETs are described in detail. The polyACE-REFET is superior to other polymer modified REFETs, showing an excellent pH insensitivity (1 mV pH−1), a long lifetime and an electrically identical behaviour as an unmodified pH ISFET or a cation-selective PVC-MEMFET (membrane FET). The cation permeselectivity of the polymer can be significantly reduced by addition of immobile cations. The applicability of a polyACE-REFET in differential measurements with a pH ISFET and a K+ MEMFET is demonstrated.
AB - Different hydrophobic polymers were used for chemical modification of ion-sensitive field effect transistors (ISFETs) in order to prepare a reference FET (REFET). Chemical attachment of the polymer to the ISFET gate results in a long lifetime of the device. Properties of polyacrylate (polyACE) REFETs are described in detail. The polyACE-REFET is superior to other polymer modified REFETs, showing an excellent pH insensitivity (1 mV pH−1), a long lifetime and an electrically identical behaviour as an unmodified pH ISFET or a cation-selective PVC-MEMFET (membrane FET). The cation permeselectivity of the polymer can be significantly reduced by addition of immobile cations. The applicability of a polyACE-REFET in differential measurements with a pH ISFET and a K+ MEMFET is demonstrated.
U2 - 10.1016/S0003-2670(00)82762-2
DO - 10.1016/S0003-2670(00)82762-2
M3 - Article
SN - 0003-2670
VL - 230
SP - 67
EP - 73
JO - Analytica chimica acta
JF - Analytica chimica acta
ER -