Electrolyte-solution-gate FETs using diamond surface for biocompatible ion sensors
Electrolyte-solution-gate FETs using diamond surface for biocompatible ion sensors
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DOI：
10.1002/1521-396x(200105)185:1
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发表时间：
2001-05-16
影响因子：
2
通讯作者：
Umezawa, H
中科院分区：
文献类型：
--
作者：
Kawarada, H;Araki, Y;Umezawa, H
金刚石场效应晶体管首次在电解质溶液中工作。由于氢封端的金刚石表面足够稳定，可以用作电化学电极，因此金刚石表面通道暴露于晶体管结构中的电解质。对于电势窗口内的偏置电压，获得了完美的夹断和饱和电流-电压特性。在 7-13 不同 pH 值的电解质中，阈值电压几乎恒定，表明氢封端金刚石表面的 pH 不敏感。基于这种 pH 不敏感的表面，可以制造离子选择性区域以形成基于晶体管的生物传感器。
Diamond 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.