Affiliation: | aINL (UMR CNRS 5270), Ecole Centrale de lyon, 69134 Ecully, France and laboratoire AMPERE (UMR CNRS 5005), INSA de Lyon, 69621 Villeurbanne, France bCIMMA (UMR CNRS 6200), Université d'Angers, 49045 Angers, France cLSA (UMR CNRS 5180), Université Claude Bernard Lyon 1, 69622 Villeurbanne, France |
Abstract: | This paper reports on organic field effect transistors (OFETs) based on two π-conjugated oligomers derived from thiophenes and their use as sensors for the detection of 2,4-dinitrotoluene (DNT). The detection mechanism relies on donor-acceptor interactions between the π-conjugated system (donor) and the nitrated molecule (acceptor). An important feature of sensors is the stability under operation, so, a large part of this work will be dealing with the behavior of OFETs under bias stress experiments as well as with the influence of temperature during operation. Most of results reported here are concerning hexyl capped tetra Thienylene–Vinylene (denominated 4-TV). Some preliminary results on the promising hexyl capped quinquethiophene derived from 3,4-ethylenedioxythiophene (denominated TETET) are also reported. Under a DNT contaminated air atmosphere ( 7 ppm), 4-TV based OFETs exhibit an increase of the drain current when DNT is present in the atmosphere as expected. |