Free-standing and
flexible field-effect transistors based on 6,13-bis(triisopropylsilylethynyl)-pentacene
(TIPS-pentacene)/polystyrene bilayers are obtained by well-controlled
phase separation of both components. The phase separation is induced
by solvent vapor annealing of initially amorphous blend films, leading
to crystallization of TIPS-pentacene as the top layer. The crystallinity
and blend morphology strongly depend on the molecular weight of polystyrene,
and under optimized conditions, distinct phase separation with a well-defined
and trap-free interface between both fractions is achieved. Due to
the distinct bilayer morphology, the resulting flexible field-effect
transistors reveal similar charge carrier mobilities as rigid devices
and additionally pronounced environmental and bias stress stabilities.
The performance of the flexible transistors remains stable up to a
strain of 1.8%, while above this deformation, a close relation between
current and strain is observed that is required for applications in
strain sensors.
The paper presents various dispersive systems developed for sensing toxic substance—ammonia. Polycarbonate dissolved in methylene chloride was used as a polymer matrix, which was enriched with: multi-walled carbon nanotubes (MWCNs), reduced graphene oxide (rGO) and conductive polymer (polyaniline—PANi). Dispersive systems were applied to the prefabricated substrates with comb electrodes by two methods: spraying and drop-casting, forming an active chemosensitive to ammonia vapours films. The spraying method involved applying the dispersion to the substrate by an aerograph for a specific time, whereas drop-casting involves depositing of the produced dispersive systems using a precision automatic pipette. The electrical responses of the obtained films were examined for nominal concentrations of ammonia vapours. Different types of dispersions with various composition were tested, the relationships between individual compounds and ammonia were analysed and the most promising dispersions were selected. Sensor containing rGO deposited by drop-casting revealed the highest change in the resistance (14.21%).
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