Peculiarities of ZnO/CuO nanowire systems formation with network morphology and their sensor properties with respect to LPG (Liquefied Natural Gas), CO$_2$ and CO$_2$ + LPG are studied in the work. The processes of oxidation of the initial zinc nanosystems in the atmosphere under different temperatures and initial heating rates are determined. The main optimization parameter is the ability of final oxide nanosystems to register different gaseous reagents. As established, the recording of current-voltage characteristics with strict velocities of the voltage change allows to obtain an extending data required to distinguish between different reagents. At the same time, comprehensive research of structural, morphological characteristics and charge transfer mechanisms are shown that capacity of ZnO/CuO nanosystems is determined mainly by fluctuations of ZnO nanosystems thickness. The presence of CuO component increases sensor sensitivity in some cases.