title: AC-conductance and capacitance measurements for ethanol vapor detection using carbon nanotube-polyvinyl alcohol composite based devices.
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.
authors: Group of Organic Optoelectronic Devices, Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990 Curitiba - PR, Brazil.
authors: Márcia W C C
authors: MW
authors: Greenshields
authors: Michelle S
authors: MS
authors: Meruvia
authors: Ivo A
authors: IA
authors: Hümmelgen
authors: Neil J
authors: NJ
authors: Coville
authors: Sabelo D
authors: SD
authors: Mhlanga
authors: Helder J
authors: HJ
authors: Ceragioli
authors: Jose C Rojas
authors: JC
authors: Quispe
authors: Vitor
authors: V
authors: Baranauskas
mesh_terms: D003217:Conductometry / Q000295:instrumentation*; D025802:Electric Capacitance; D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D000431:Ethanol / Q000032:analysis*; D005740:Gases / Q000032:analysis; D036103:Nanotechnology / Q000295:instrumentation*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D014159:Transducers
chemical_list: D005740:Gases; D037742:Nanotubes, Carbon; D000431:Ethanol; D011142:Polyvinyl Alcohol