POROUS SILICON AS A SUBSTRATE MATERIAL FOR POTENTIOMETRIC BIOSENSORS

For the first time porous silicon has been investigated for the purpos e of application as a substrate material for potentiometric biosensors operating in aqueous solutions. Porous silicon was prepared from diff erently doped silicon substrates by a standard anodic etching process. After oxidation, penicillinase, an enzyme sensitive to penicillin, wa s bound to the porous structure by physical adsorption. To characteriz e the electrochemical properties of the so build up penicillin biosens or, capacitance-voltage (C-V) measurements were performed on these fie ld-effect structures.