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Fiber-optic sensors based on conductive polymers

In the present work, in order to give grounds to the condition of of conductive polymer films, we have studied the thermal behavior of polymer. With the aim to apply vacuum deposited polyaniline (PAN) films as sensing elements of fiber -optic sensors (FOS), the technology of polymer deposition that gives a possibility to obtain conductive emeral dine PAN form by standard protonation methods has been developed. The influence of deposition temperature on refractive index and spectral characteristics of films is specified. On the base of the results change in PAN films optical properties with the change in pH value of the medium, pH level (as well as ammonia, CO) FOS are elaborated. The distinctive feature of sensor optical response is its high sensitivity to pH value, such as, due to increase in pH changes of optical adsorption are observed that is especially high at 500-550 nm and 800-900 nm of spectral range. For a FOS processing analysis, we carried out measurements of sensor optical response to pH value in two wavelengths (540 nm and 900 nm).