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Alternative sensor materials for light-addressable potentiometric sensors
Ist Teil von
Sensors and actuators. B, Chemical, 2001-06, Vol.76 (1), p.388-392
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2001
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
Ta
2O
5 and porous Si were investigated as alternative sensor materials for the light-addressable potentiometric sensor (LAPS). The Ta
2O
5 LAPS, prepared by the pulsed laser deposition (PLD) technique, showed a high pH sensitivity of 57.5
mV/pH and a good linearity. Porous Si was prepared by anodic etching of Si in a mixture of HF and ethanol. The porous Si LAPS with a Si
3N
4 layer showed a pH sensitivity of 57.3
mV/pH. As an application of the porous Si LAPS, a penicillin LAPS was fabricated by immobilization of penicillinase on the surface. The pH change due to the enzymatic reaction was detected for the penicillin concentration between 250
μM and 10
mM.