A pH sensor based on electric properties of nanotubes on a glass substrate

Autor: Subagyo Agus, Sueoka Kazuhisa, Takeda Seiji, Nakamura Motonori, Ishii Atsushi, Hosoi Hirotaka, Mukasa Koichi
Jazyk: angličtina
Rok vydání: 2007
Předmět:
Zdroj: Nanoscale Research Letters, Vol 2, Iss 4, Pp 207-212 (2007)
Druh dokumentu: article
ISSN: 1931-7573
1556-276X
DOI: 10.1007/s11671-007-9053-9
Popis: AbstractWe 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.
Databáze: Directory of Open Access Journals
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