EVALUATION OF CONDUCTING LB FILMS BASED ON ETHYLENEDITHIOTETRATHIAFULVALENE (EDT-TTF) DERIVATIVES FOR PHOSPHINE SENSING

We report the preliminary results obtained with new conducting LB films based on EDT-TTF derivatives used as sensing heads in conductivity phosphine sensors. This second generation of conducting materials for gas sensors derived from the phosphine sensing properties of the previous heads based on TCNQ derivatives: like TCNQ derivative films, EDT-TTF derivative films exhibit a stable and well-controlled conducting behaviour after iodine vapour exposure and large conductivity variations under phosphine exposure. The mean features of the new sensing head are a short response time (30 s) and a ppm range sensitivity, which is achieved without the need of cycling at high concentrations of gas.