Electrolyte-Solution-Gate FETs Using Diamond Surface for Biocompatible Ion Sensors
2001; Wiley; Volume: 185; Issue: 1 Linguagem: Inglês
10.1002/1521-396x(200105)185
ISSN1521-396X
AutoresHiroshi Kawarada, Yuta Araki, Toshikatsu Sakai, T. Ogawa, Hitoshi Umezawa,
Tópico(s)Electronic and Structural Properties of Oxides
ResumoDiamond field effect transistors have operated in electrolyte solution for the first time. Since the hydrogen-terminated diamond surfaces are stable enough for the use as an electrochemical electrode, the diamond surface channels are exposed to the electrolyte in the transistor structure. A perfect pinch-off and saturated current–voltage characteristics have been obtained for bias voltages within the potential window. The threshold voltages are almost constant in electrolytes with different pH values of 7–13, indicating pH insensitiveness of the hydrogen-terminated diamond surface. Based on this pH insensitive surface, ion selective regions can be fabricated to form transistor-based biosensors.
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