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Electrical and thermal diffusivity of highly porous multigraphene structures
Siliutin A.N.1, Shulyak V. A.
1, Morozov N. S.
1, Malakho A. P.
2, Filimonov S. V.
1, Krasilnikov V. P.
2, Govorov I. S.
2, Gubin V. Yu.1, Demchenko D. V.1, Nigmatullin I. K.1, Chebotarev S. N.
1, Avdeev V. V.
1
1Lomonosov Moscow State University, Moscow, Russia
2Inter-University Scientific and Technical Center “Composite”, Tula State University, Tula, Russia
2Inter-University Scientific and Technical Center “Composite”, Tula State University, Tula, Russia
Email: morozov.nick.s@gmail.com, malakho@unichimtek.ru, chebotarev.sergei@gmail.com
The dependence of electrical conductivity and thermal diffusivity on the density of multigraphene structures at the initial stage of the compaction has been studied. It was shown that at the density of ~ 0.05 g/cm3 (ρcr1), the mechanism of electrical conductivity changes and an inflection point is observed on the curve, showing the dependence of material density on the compaction force. A change in the thermal diffusivity mechanism was detected by the laser flash method at the density of ~ 0.4 g/cm3 (ρcr2). The interval [ρcr1, ρcr2] is considered to be the range in which a highly porous multigraphene structure with unique thermal resistance properties exists. When the first critical point is approached, the contact bridges of conductivity are formed, while the second point indicates the transition to continuously layered multigraphene material. Keywords: multigraphene material, multigraphene structures, pressing, electrical conductivity, thermal diffusivity, porosity.
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