The structure, morphology, and chemical state of composites based on arrays of multiwalled carbon nanotubes and tin oxide (SnOx/MWCNT) obtained using the method of magnetron sputtering were studied using the scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and near edge X-ray absorption fine structure methods. It has been shown that porous layers with a defective structure containing Sn(II) and Sn(IV) oxides along with tin metal were formed on the surface of the MWCNT, which were transformed into crystalline Sn(IV) oxide with a tetragonal lattice at a temperature of ~550°C. The special characteristics of the oxidation and crystallization of the composite components depending on the modes of thermal treatment have been studied. It has been demonstrated that varying the modes of thermal treatment enabled nanostructured materials to be formed that differed significantly in structure, morphology, and composition. It has been hypothesized that the special aspects of the transformation of the composite structure in the process of thermal treatment were determined by the presence of contact of the MWCNT surface with atmosphere.
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The authors are grateful to the staff of the Omsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences: V.E. Roslikov for the creation of composites by the method of magnetron sputtering. The authors are also grateful to the management of the Omsk Regional Shared Equipment Center SB RAS for providing equipment for the analysis of samples by SEM and EDX methods and to the administration of the Russian–German channel of the BESSY II electron storage ring as well as D.A. Smirnov (beamline scientist at the RGL-PES station) for assistance in conducting studies by the NEXAFS method.
This work was carried out within the governmental order for Omsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences (project registration number 121021600004-7).
Translated by D. Marinin
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Nesov, S.N., Korusenko, P.M., Bolotov, V.V. et al. Kinetics of Oxidation of Composites Based on Arrays of Multiwalled Carbon Nanotubes and Tin Oxide Obtained by the Magnetron Sputtering Method. Prot Met Phys Chem Surf 57, 735–744 (2021). https://doi.org/10.1134/S2070205121040183
- multiwall carbon nanotubes
- tin oxide
- magnetron sputtering
- electron microscopy
- X-ray absorption spectroscopy
- synchrotron radiation