The 39th volume of the Journal of Metastable and Nanocrystalline Materials includes articles that review the zinc oxide crystal growth process with and without adding the graphene oxide, as well as analyse the microstructure and semiconductor properties of finished materials. The results of transmission electron microscope analysis of polycrystalline silicon for thin film solar cells and investigation of methods for synthesis and properties study of nickel-zinc nanoferrites and cadmium-substituted cobalt ferrite nanoparticles are also presented in this volume. This issue will be helpful to specialists in materials science and applied nanotechnologies.