Structure of composites based on multi-walled carbon nanotubes and metal oxides formed by magnetron sputtering.
Using the XPS and NEXAFS methods, as well as SEM and TEM, the structure of composites based on multilayer carbon nanotubes (MWNT) and tin oxides (SnOx / MWNT) and titanium (TiOx / MWNT) obtained using magnetron sputtering was studied. The obtained data showed that the formation of composites by this method provides high adhesion of metal oxides to the MWNT surface due to the formation of chemical bonds (Sn-O-C, Ti-O-C) at the interfaces of the composites. The formation of heteroatomic chemical bonds is provided by the formation of structural defects and functional oxygen-containing groups in MWNT walls when metal oxides precipitate on their surfaces. It is shown that metal oxides in composites are represented by a mixture of oxides of variable composition with oxygen deficiency and defective crystal structure. The presence of dangling bonds and structural defects provides a high chemical activity of metal oxides and their fixation on the functional groups present on the outer walls of the MWNT. The results of the analysis showed that the use of thermal treatment of composites in air in the temperature range of 500-700 ° C leads to the crystallization of metal oxide films on the MWNT surface. The authors thanks Roslikov V.E. and Kan V.E. for synthesis of the composites. The work was supported by a grant from the Russian Foundation for Basic Research project № 18-32-00233 mol_a