Fluorene-thiophene-based thin-film fluorescent chemosensor for methamphetamine vapor

We here report a new “turn-on” sensory mechanism for vapor sensing in solid-state based on binding-induced weakening of internal heavy-atom effect. Spin-coating films of 9, 9-diocylfluorene-2, 7-bisthiphene 1 and poly [(9, 9-diocylfuorenyl-2, 7-diyl)-alt (3-hexylthiophene-2, 5-diyl)] 2 were obtained and characterized by absorption and fluorescence spectra. The vapor sensing behaviors of the films were investigated with respect to the amines such as n-propylamine, aniline, benzylamine, p-toluidine, diisopropylanmine and methylamphetamine at room temperature. The result indicated that the films exhibited rapid and selective “turn-on” fluorescent response to methylamphetamine vapor.