TAILIEUCHUNG - Báo cáo hóa học: " A pH sensor based on electric properties of nanotubes on a glass substrate"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A pH sensor based on electric properties of nanotubes on a glass substrate | Nanoscale Res Lett 2007 2 207-212 DOI s11671-007-9053-9 NANO EXPRESS A pH sensor based on electric properties of nanotubes on a glass substrate Seiji Takeda Motonori Nakamura Atsushi Ishii Agus Subagyo Hirotaka Hosoi Kazuhisa Sueoka Koichi Mukasa Received 28 December 2006 Accepted 5 March 2007 Published online 30 March 2007 To the authors 2007 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. Keywords Carbon nanotube Field effect transistor pH Glass Immobilization Introduction Because single molecule research sometimes contributes to mechanisms of biomolecular interactions some methods S. Takeda El M. Nakamura A. Ishii H. Hosoi K. Mukasa Creative Research Initiative Sousei Hokkaido University Sapporo 001-0021 Japan e-mail s-takeda@ A. Subagyo K. Sueoka Graduate School of Information Science and Technology Hokkaido University Sapporo 060-0814 Japan have been developed to observe or manipulate single molecules in the last decade laser tweezers scanning probe microscopy optical microscopy and so on. The combination of these methods yields more information about the mechanism of .

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