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Sensors 2010, 10(4), 2812-2820; doi:10.3390/s100402812

Development of a Chemiresistor Sensor Based on Polymers-Dye Blend for Detection of Ethanol Vapor

3,*  and 2,*
1 Pós-graduação em Engenharia Elétrica, Universidade Federal do Pará, 66075-900, Belém-PA, Brazil 2 Departamento de Física, Universidade Federal do Paraná, 81531-990, Curitiba-PR, Brazil 3 Departamento de Física, Universidade Federal do Pará, 66075-110, Belém-PA, Brazil
* Authors to whom correspondence should be addressed.
Received: 15 January 2010 / Revised: 3 February 2010 / Accepted: 1 March 2010 / Published: 29 March 2010
(This article belongs to the Section Chemical Sensors)
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The conductive blend of the poly (3,4-ethylene dioxythiophene) and polystyrene sulfonated acid (PEDOT-PSS) polymers were doped with Methyl Red (MR) dye in the acid form and were used as the basis for a chemiresistor sensor for detection of ethanol vapor. This Au│Polymers-dye blend│Au device was manufactured by chemical vapor deposition and spin-coating, the first for deposition of the metal electrodes onto a glass substrate, and the second for preparation of the organic thin film forming ~1.0 mm2 of active area. The results obtained are the following: (i) electrical resistance dependence with atmospheres containing ethanol vapor carried by nitrogen gas and humidity; (ii) sensitivity at 1.15 for limit detection of 26.25 ppm analyte and an operating temperature of 25 °C; and (iii) the sensing process is quickly reversible and shows very a low power consumption of 20 μW. The thin film morphology of ~200 nm thickness was analyzed by Atomic Force Microscopy (AFM), where it was observed to have a peculiarly granulometric surface favorable to adsorption. This work indicates that PEDOT-PSS doped with MR dye to compose blend film shows good performance like resistive sensor.
Keywords: chemiresistor sensor; PEDOT-PSS; MR dye; ethanol vapor chemiresistor sensor; PEDOT-PSS; MR dye; ethanol vapor
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Dos Reis, M.A.L.; Thomazi, F.; Del Nero, J.; Roman, L.S. Development of a Chemiresistor Sensor Based on Polymers-Dye Blend for Detection of Ethanol Vapor. Sensors 2010, 10, 2812-2820.

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