ИСТИНА

Nanonanoparticles of noble metals are widely used in drug delivery systems and in various areas of biology and medicine. The biological behavior of materials is strongly influenced by the chemical situation on the surface. Pd, Pd-Ag nanoparticles have been synthesized using new methods of pulse laser ablation - deposition (PLA-PLD) on carbon fibers and pyrolytic carbon powder and was characterized by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) for their size, morphology, and chemical state. Modifications of charge composition and structure of laser plasma in inhomogeneous electrical, magnetic, electromagnetic fields, without change of parameters of KrF-laser radiation on metal targets allow to change a chemical state of deposited metal nanoparticles and their average size. By results X-ray photoelectron spectroscopy (XPS), at PLA-PLD of Pd (or Pd/Ag ~10:1) on carbon substrates in vacuum (10-3Pa, RT) chemical state palladium can be changed from Pd0 up to Pd n+ (1<n <4). TEM investigation revealed that Pd nanoparticles are nanocrystallites and their average size can be modified thus from 1 up to 15 nanometers.