Transmission Line Impedance of Carbon Nanotube Thin Films for Chemical Sensing

Details Transmission Line Impedance of Carbon Nanotube Thin Films for Chemical Sensing Transmission Line Impedance of Carbon Nanotube Thin Films for Chemical Sensing

2006-12-16

arxiv.org/abs/cond-mat/0612432v1

Physics

Condensed Matter

Materials Science

14 pages, 4 figures

Scientific paper

We measure the resistance and frequency-dependent gate capacitance of carbon nanotube (CNT) thin films in ambient, vacuum, and under low-pressure (10E-6 torr) analyte environments. We model the CNT film as an RC transmission line and show that changes in the measured capacitance as a function of gate bias and analyte pressure are consistent with changes in the transmission line impedance due to changes in the CNT film resistivity alone; the electrostatic gate capacitance of the CNT film does not depend on gate voltage or chemical analyte adsorption. However, the CNT film resistance is enormously sensitive to low pressure analyte exposure.

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