Graphene-like carbon of shungite rocks of Karelia for the production of nanostructured films

Abstract

Natural nanocarbon from shungite can be used to produce thin conductive films needed in optical devices, in semiconductor technologies and electrochemical applications, in wear-resistant coatings of hard disks. This paper describes the properties of thin films obtained from natural shungite nanocarbon by sublimation in the vacuum on glass substrates coated with conductive thin coatings (In2O3, ITO, ZnO). The thickness and homogeneity of the resulting carbon films were evaluated using a laser 3D microscope. The microstructure and morphology of the films were monitored by scanning electron microscopyand the Raman scattering method. The dependence of the structure of the film on the composition of the conductive coatings placed on the substrate was revealed. On quartz glass with In2O3 film coating, carbon nanoparticles formed two-dimensional films on In2O3 grains and three-dimensional mesh networks in the inter-grain space. The carbon film on structured quartz glass with ZnO formed a more uniform surfaceand coating density. NaCl microcrystals coated with a nanocarbon film were detected on a substrate with ITO by microprobe analysis. A two-dimensional film was isolated bydissolving NaCl crystals. Comparison of the Raman spectra of the carbon films deposited on the substrates with the conductive contacts with the spectrum of the original shungite powder confirmed the graphene-like structure of shungite carbon, previously described for nanoparticle dispersions.

Keywords

• наноуглерод
• углеродные пленки
• сублимация
• спектроско- пия комбинационного рассеяния
• сканирующая электронная микроскопия.