Organic transistor chemical sensors device structure

The presence of flexible side-chains make them soluble in common organic solvents [98,204-7]. These polymers have been proved by solid-state NMR and small-angle X-ray diffraction measurements to have hexagonal columnar structures in which the phthalocyanine cores are horizontally stacked with respect to the columnar axis, even at ambient temperatures [107,139,207]. The rigid rod nature of these polymers have been proved experimentally [207,208]. Their completely hydrophobic polymer allows for the controlled and highly reproducible deposition of ultra-thin films. LB films are used as branes in field effect transistors (PET S) and chemical sensors [209]. Devices based on the LB films show stable electroactivity and the electrodes show an almost Nemstian response. The change of pH in the electrolyte does not show any long time drifts. 

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