AC-Conductance and Capacitance Measurements for Ethanol Vapor Detection Using Carbon Nanotube-Polyvinyl Alcohol Composite Based Devices
We report the preparation of inexpensive ethanol sensor devices using multiwalled carbon nanotube–polyvinyl alcohol composite films deposited onto interdigitated electrodes patterned on phenolite substrates. We investigate the frequency dependent response of the device conductance
and capacitance showing that higher sensitivity is obtained at higher frequency if the conductance is used as sensing parameter. In the case of capacitance measurements, higher sensitivity is obtained at low frequency. Ethanol detection at a concentration of 300 ppm in air is demonstrated.
More than 80% of the sensor conductance and capacitance variation response occurs in less than 20 s.
Keywords: CARBON NANOTUBES; ELECTRICAL PROPERTIES; POLYMERS; SENSORS
Document Type: Research Article
Publication date: 01 March 2011
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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