%0 Journal Article
%T Development of a Chemiresistor Sensor Based on Polymers-Dye Blend for Detection of Ethanol Vapor
%A Marcos A. L. Dos Reis
%A Fabiano Thomazi
%A Jordan Del Nero
%A Lucimara S. Roman
%J Sensors
%D 2010
%I MDPI AG
%R 10.3390/s100402812
%X 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 ˇăC; and (iii) the sensing process is quickly reversible and shows very a low power consumption of 20 ¦ĚW. 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.
%K chemiresistor sensor
%K PEDOT-PSS
%K MR dye
%K ethanol vapor
%U http://www.mdpi.com/1424-8220/10/4/2812