A New Enzyme Transducer Combination: The Enzyme Transistor
The p-channel Pd-MOS-transistor used resembles an ordinary field-effect transistor, but the gate metal is a catalytic metal, palladium, instead of e.g. aluminum, which makes it sensitive to hydrogen (1). It has also been found to respond to other hydrogen containing gases such as NH3 (1) and H2S (2). The practical sensitivity of the device is better than 1 ppm of hydrogen or 10 ppm of NH3 in air. As a number of enzymic reactions produce these gases we investigated the analytical potential of a combination of such a specific transistor with enzymes.
KeywordsThreshold Voltage Hydrogen Concentration Urease Activity Catalytic Metal Gate Metal
Unable to display preview. Download preview PDF.