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

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Title: A pH sensor based on electric properties of nanotubes on a glass substrate
Authors: Takeda, Seiji Browse this author
Nakamura, Motonori Browse this author
Ishii, Atsushi Browse this author
Subagyo, Agus Browse this author
Hosoi, Hirotaka Browse this author
Sueoka, Kazuhisa Browse this author
Mukasa, Koichi Browse this author
Keywords: carbon nanotube
field effect transistor
Issue Date: Apr-2007
Publisher: Springer
Journal Title: Nanoscale Research Letters
Volume: 2
Issue: 4
Start Page: 207
End Page: 212
Publisher DOI: 10.1007/s11671-007-9053-9
Abstract: 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 an n-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 the p-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.
Rights: The original publication is available at
Type: article (author version)
Appears in Collections:創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 武田 晴治

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