Nano Science and Technology Institute
Nanotech 2012 Vol. 1
Nanotech 2012 Vol. 1
Nanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Chapter 3: Carbon Nano Structures & Devices

The acid-base properties of carboxylated CNT and the design of CNTFET biosensor

Authors:H.J. Kwon, J-M Woo, J. Lim, S.H. Kim, Y.J. Park
Affilation:Seoul National University, KR
Pages:269 - 272
Keywords:carbon nanotube, dynamic measurement, pH of solution
Abstract:We observed the sign of the two responses from carbon nanotube field effect transistor (CNTFET) in aqueous solution by means of dynamic measurements. Two types of surface group, the hydroxyl and the carboxyl group of sensor surface are amphoteric materials depending on the pH. After blocking of COOH group on the CNT surface, CNT characteristics become insensitive to pH condition. This result brings benefits to reliable operation and optimal design of CNTFET sensor
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