Related Experiment Video
Updated: Jun 3, 2026
Fabrication of Carbon Nanotube High-Frequency Nanoelectronic Biosensor for Sensing in High Ionic Strength Solutions
Published on: July 22, 2013
AC-conductance and capacitance measurements for ethanol vapor detection using carbon nanotube-polyvinyl alcohol
Márcia W C C Greenshields1, Michelle S Meruvia, Ivo A Hümmelgen
1Group of Organic Optoelectronic Devices, Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990 Curitiba - PR, Brazil.
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.
