The 40th volume of the journal contains articles that present to readers the research results in properties and some specific features of application metal-oxide and gold nanoparticles, carbon nanotubes, hybrid metal-halide perovskite for optoelectronics application and conducting solid biopolymer electrolytes for sodium-ion batteries. This volume will be helpful to specialists in optoelectronics, energy storage and chemists whose activity is related to applied nanotechnology, and the synthesis and investigation of nanomaterials.