Key words: mesoscopic 3D-structures, composed of Pd-Ni nanowires; amorphous-nanocrystalline structure; low-temperature oxygen plasma; mesoporous composite "metal oxide (semiconductor) on metal frame". AbstractIt has been found that volumetric mesoporous structures composed of Pd-Ni nanowires exhibit active interaction with low temperature non-equilibrium oxygen plasma, which results in a light red incandescence of the samples. The incandescent process lasts for about 10 min.After plasma-chemical treatment, the diffraction pattern revealed the presence of a nanocrystalline niсkel (II) oxide phase on a surface of the samples. Magnetic measurements showed that a temperature dependence of the magnetic susceptibility as well as a magnetic hysteresis loop of the sample exposed in the plasma is typical for metals and similar to the dependence for the original Pd-Ni sample. The composite mesoporous structures produced by the plasma-chemical treatment have a conducting Pd-Ni frame covered with a niсkel (II) oxide (semiconductor) and are of interest as a promising material for electronic devices.2