The SnO2/multiwall-carbon-nanotube (MWCNT) nanocomposite powder was prepared by the sol-gel method and gas sensitive structures (ceramic and thick film) were manufactured made of it. The morphology of as-provided carbon nanotubes (CNTs) and prepared nanocomposite powder was investigated by scanning electron microscopy (SEM). The EDX and XRD analyses were also carried out, the element structure of a nanocomposite has been determined. The sensibilization of the nanocomposite SnO2/MWCNT in the Ru(OH)Cl3 water solution leads to the appearance of rather high sensitivity to isobutane already at 120°C. The sensitivity of prepared sensors was measured at different gas concentration. The influence of variation of the sensibilized solution concentration and the work body temperature on the sensor sensitivity was investigated.