ja035490k_si_001.pdf (234.33 kB)
Thin Film Construction and Characterization and Gas-Sensing Performances of a Tailored Phenylene−Thienylene Copolymer
journal contribution
posted on 2003-07-01, 00:00 authored by Francesco Naso, Francesco Babudri, Donato Colangiuli, Gianluca M. Farinola, Fabio Quaranta, Roberto Rella, Raffaele Tafuro, Ludovico ValliAn alternating copolymer, poly(2,5-dioctyloxy-1,4-phenylene-alt-2,5-thienylene), has been synthesized and used in this research. The behavior of the floating film at the air−water interface has been
investigated by measuring surface pressure versus area Langmuir isotherms and contemporaneously by
reflection spectroscopy and Brewster angle microscopy. The floating films were transferred by the Langmuir−Schäfer (horizontal lifting) method onto various substrates. It is apparent from these analyses that the
effective conjugation length is larger than those in other electroactive polymers and that a strong coplanarity
and interchain association takes place above all in the floating film on the water surface and in the transferred
multilayers. Such films were used as the active layers in resistive chemical gas sensor devices, thus revealing
excellent sensitivity toward NO2, reversibility, and time stability of the response.