Formation of tin-tin oxide core-shell nanoparticles in the composite SnO2-x/nitrogen-doped carbon nanotubes by pulsed ion beam irradiation

The complex methods of transmission electron microscopy, energy dispersive X-ray analysis, and X-ray photoelectron spectroscopy were used to investigate the changes in the morphology, phase composition, and electronic structure of the composite SnO2-x/nitrogen-doped multiwalled carbon nanotubes (SnO2-x/N-MWCNTs) irradiated with the pulsed ion beam of nanosecond duration. The irradiation of the composite SnO2-x/N-MWCNTs leads to the formation of nanoparticles with the core-shell structure on the surface of CNTs with a sharp interfacial boundary. It has been established that the core is a metal tin (Sn-0) with a typical size of 5-35 nm, and the shell is a thin amorphous layer (2-6 nm) consisting of nonstoichiometric tin oxide with a low oxygen content. The core-shell structure Sn-SnOx is formed due to the process of heating and evaporation of SnO2-x under the effect of the ion beam, followed by vapor deposition on the surface of carbon nanotubes. (C) 2016 Elsevier B.V. All rights reserved.