Abstract
By chemical modification of an ion-sensitive field-effect transistor, a sensor (CHEMFET) has been developed whose sensitivity for nitrate has been tested. A plasticized poly(vinyl chloride) (PVC) membrane, which contains lipophilic tetra-n-octyl-ammonium ions, is responsible for the nitrate sensitivity of the device. This membrane has been attached physically on top of a pH-buffered hydrogel, which itself has been attached covalently to the gate oxide of the field-effect transistor. The influence of the plasticizer in the PVC membrane on the selectivity pattern of the CHEMFET for the detection of nitrate has been investigated.
Original language | English |
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Pages (from-to) | 197-201 |
Journal | Sensors and Actuators B: Chemical |
Volume | 17 |
Issue number | 17 |
DOIs | |
Publication status | Published - 1994 |
Keywords
- METIS-106583
- IR-12278