Creative Research Initiative "Sousei", Hokkaido University, Sapporo, 001-0021, Japan.
Nanoscale Res Lett. 2007 Mar 30;2(4):207-12. doi: 10.1007/s11671-007-9053-9.
We fabricated a pH-sensitive device on a glass substrate based on properties of carbon nanotubes. Nanotubes were immobilized specifically on chemically modified areas on a substrate followed by deposition of metallic source and drain electrodes on the area. Some nanotubes connected the source and drain electrodes. A top gate electrode was fabricated on an insulating layer of silane coupling agent on the nanotube. The device showed properties of ann-type field effect transistor when a potential was applied to the nanotube from the top gate electrode. Before fabrication of the insulating layer, the device showed that thep-type field effect transistor and the current through the source and drain electrodes depend on the buffer pH. The current increases with decreasing pH of the CNT solution. This device, which can detect pH, is applicable for use as a biosensor through modification of the CNT surface.
我们基于碳纳米管的性质在玻璃基底上制造了一种 pH 敏感的器件。纳米管被特异性地固定在基底上化学修饰的区域上，然后在该区域上沉积金属源极和漏极电极。一些纳米管连接源极和漏极电极。在纳米管上的硅烷偶联剂的绝缘层上制造了顶栅电极。当从顶栅电极向纳米管施加电势时，该器件表现出 ann 型场效应晶体管的特性。在制造绝缘层之前，该器件表现出 p 型场效应晶体管的特性，并且源极和漏极电极之间的电流取决于缓冲 pH 值。随着 CNT 溶液 pH 值的降低，电流增加。通过修饰 CNT 表面，这种能够检测 pH 值的器件可适用于作为生物传感器。
