Alternative sensor materials for light-addressable potentiometric sensors

T. Yoshinobu, H. Ecken, A. Poghossian, H. Lüth, H. Iwasaki, M. J. Schöning

Research output: Contribution to journalConference articlepeer-review

39 Citations (Scopus)


Ta2O5 and porous Si were investigated as alternative sensor materials for the light-addressable potentiometric sensor (LAPS). The Ta2O5 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 Si3N4 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.

Original languageEnglish
Pages (from-to)388-392
Number of pages5
JournalSensors and Actuators B: Chemical
Issue number1-3
Publication statusPublished - 2001 Jun 1
EventProceeding of the 8th International Meeting on Chemical Sensors - Basel, Switzerland
Duration: 2000 Jul 22000 Jul 5


  • Chemical sensor
  • Light-addressable potentiometric sensor (LAPS)
  • Penicillinase
  • Porous silicon
  • Pulsed laser deposition
  • Sensor
  • TaO


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