Presentation of electrical conductivity of graphene-containing shungite on the basis of current tubes model.

Abstract

Статья поступила в редакцию 18 февраля 2020 г.

Electrophysical Properties and Structure of Natural Disordered sp2 Carbon

“…This scattering is largely determined by the distance between the stacks. A theoretical analysis of the effect of the nanostructure on the conductivity of D sp 2 C based on the structure as a set of stacks of graphene layers was carried out in [ 85 , 86 , 87 ]. Here, the chaotic nature of the structure of shungite carbon was reduced to a regular model of parallel conductive tubes from sequentially arranged stacks of graphene layers with dimensions of a few nanometers ( Figure 16 ) [ 86 ].…”

“…A theoretical analysis of the effect of the nanostructure on the conductivity of D sp 2 C based on the structure as a set of stacks of graphene layers was carried out in [ 85 , 86 , 87 ]. Here, the chaotic nature of the structure of shungite carbon was reduced to a regular model of parallel conductive tubes from sequentially arranged stacks of graphene layers with dimensions of a few nanometers ( Figure 16 ) [ 86 ]. The comparison of the model with the real structure was carried out on the example of two shungite samples from the Maksovo and Nigozero occurrences, in which the average sizes of the stacks and the gaps between them were estimated using high-resolution transmission microscopy methods [ 85 , 87 ].…”

Influence of layers orientation of graphene stacks in shungite disordered carbon to its integral electrical conductivity

“…The high screening ability of shungite is conditioned by its electrical conductivity, the main role in the formation of which is played carbon, grouped in the form of finite spatial regions separated by interlayers of quartz [4][5][6][7][8]. An important tool to study the shungite structure at the micro level is resistive microscopy, which allows obtaining conductivity maps that reflect the mutual spatial distribution of carbon and quartz and, based on the analysis of such maps, determine the integral conductivity of the sample as a whole [8][9][10][11][12].…”

“…The structure of carbon is a conglomerate of multilayer graphene packs [4,10,11,13]. The characteristic dimensions of such packs are in the order of nanometers.…”

“…The carbon formations observed by this method consist of "multi-storey" graphene bundles, within which the orientation of the graphene layers has a clearly pronounced predominant direction. The conductivity of the packs is anisotropic [9][10][11].…”