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Type: Artigo de periódico
Title: AC-Conductance and Capacitance Measurements for Ethanol Vapor Detection Using Carbon Nanotube-Polyvinyl Alcohol Composite Based Devices
Author: Greenshields, MWCC
Meruvia, MS
Hummelgent, IA
Coville, NJ
Mhlanga, SD
Ceragioli, HJ
Quispe, JCR
Baranauskas, V
Abstract: 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.
Subject: Electrical Properties
Carbon Nanotubes
Country: EUA
Editor: Amer Scientific Publishers
Rights: fechado
Identifier DOI: 10.1166/jnn.2011.3518
Date Issue: 2011
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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