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Background. For today there is high need of cheap portable gas sensors for operational monitoring of the environment and the atmosphere in different areas of life and industry. Recently, hybrid nanosystems based on conductive polymers reinforced with semiconductor nanoparticles of different nature are in the focus of increased attention as materials for sensor elements.Objective. Creating sensitive elements based on composite films of poly-3,4-ethylenedioxythiophene combined with nanocrystals of porous silicon and zinc oxide and studying the electrical response to the absorption of gas molecules.Methods. The structure of ZnO nanoparticles and porous silicon powder was examined with X-ray diffraction. Organicinorganic hybrid films were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy. To evaluate the sensor properties, electrical response of obtained composite films due to adsorption of ammonia and ethanol molecules were studied.Results. Our studies suggest some interaction between organic and inorganic components in the formed hybrid monolithic film. Increasing of nanocomposite electrical resistance due to adsorption of ammonia and ethanol molecules was registered. It was established that the maximum sensitivity of the hybrid films is observed at low concentration ranges. The kinetics of the response of the hybrid composites to the changing concentration of gas molecules is fast enough to be employed in various microelectronic chemical sensors.Conclusions. The combination of the porous silicon and zinc oxide nanoparticles provides an increasing of surface area of the sensors based on organic-inorganic composites and their high sensitivity and selectivity to ethanol and ammonia molecules.