01947nas a2200217   4500008004100000022001400041245007000055210006900125260006900194300001400263490000800277520120500285653002001490653002001510653002201530653001601552100001901568700002101587700002201608856009901630       2009                        eng d  a0379-677900aCO sensor based on polypyrrole functionalized with iron porphyrin0 aCO sensor based on polypyrrole functionalized with iron porphyri  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcJUN  a1019-10230 v1593 a<p>Polypyrrole (PPy) was chemically functionalized with 5,10,15,20-tetraphenyl-21H,23H-porphyrin iron(III) chloride (FeTPPCl) with special interest on noxious carbon monoxide (CO) gas in ppm level. Controlled functionalization of PPy was achieved with incorporation of various concentrations of porphyrin. The resulted semiconducting material was well characterized by different techniques such as UV-vis spectroscopy, FTIR, GFAAS, XRD, and EDAX. The functionalized polypyrrole material on interdigitated electrode was experienced an immediate increase in resistance when exposed to carbon monoxide gas at very low concentration. The CO gas interacted very fast with the FeTPPCl functionalized PPy at room temperature (RT) and then slowly saturated. The response of these materials was not unidirectional, but reverses to the original resistance level when CO was removed from the test chamber. The highest response factor (Delta R/R(0) x 100) and lowest response time (t(50)) obtained are 12 and 169s, respectively. An optimum level of doping (1 mol% of FeTPPCl) was established for the highest sensitivity and the detection level is as low as 100ppm. (C) 2009 Elsevier B.V. All rights reserved.</p>10acarbon monoxide10aChemical sensor10aFe(III) porphyrin10apolypyrrole1 aPaul, Santhosh1 aAmalraj, Francis1 aRadhakrishnan, S.  uhttps://library.ncl.res.in/content/co-sensor-based-polypyrrole-functionalized-iron-porphyrin-0