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

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

1
,
2
,
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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Abstract

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 3.0).
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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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