TY - JOUR
T1 - Structure-property relationships in the electrical conductivity of multilayer graphene sheet/epoxy nanocomposites
AU - Canché, H.
AU - Oliva-Avilés, A. I.
AU - Oliva, A. I.
AU - Sosa, V.
AU - Pacheco-Catalán, D. E.
AU - Cruz-Estrada, R. H.
AU - Avilés, F.
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2024/1/1
Y1 - 2024/1/1
N2 - The relationship between the physicochemical properties of multilayer graphene sheets (GSs), their resulting state of dispersion, and the effective electrical conductivity of GS/epoxy nanocomposites is investigated. To construct such relationship, four types of GSs with dissimilar properties were physicochemically, structurally, and morphologically characterized, and correlated with the direct current and alternating current (AC) electrical responses of their polymeric nanocomposites. It was found that the most influential parameters that affect the electrical conductivity of the nanocomposites are the size and density of agglomerates formed at the mesoscale. Both parameters, in turn, are governed by the physicochemical properties of the individual GSs. At the nanostructure level, the lateral size of the GS arises as the most influential parameter, with larger GSs yielding higher conductivities and lower percolation thresholds. The carbon/oxygen ratio of the GSs also showed moderate influence. The nanocomposites showed a resistive (R)-capacitive (C) electrical response in AC, which fits to a two-element parallel RC model. Both, the power law and general effective media (GEM) models predict similar percolation thresholds, but the GEM model is more general and adequately reproduces the whole electrical curve for all filler concentrations.
AB - The relationship between the physicochemical properties of multilayer graphene sheets (GSs), their resulting state of dispersion, and the effective electrical conductivity of GS/epoxy nanocomposites is investigated. To construct such relationship, four types of GSs with dissimilar properties were physicochemically, structurally, and morphologically characterized, and correlated with the direct current and alternating current (AC) electrical responses of their polymeric nanocomposites. It was found that the most influential parameters that affect the electrical conductivity of the nanocomposites are the size and density of agglomerates formed at the mesoscale. Both parameters, in turn, are governed by the physicochemical properties of the individual GSs. At the nanostructure level, the lateral size of the GS arises as the most influential parameter, with larger GSs yielding higher conductivities and lower percolation thresholds. The carbon/oxygen ratio of the GSs also showed moderate influence. The nanocomposites showed a resistive (R)-capacitive (C) electrical response in AC, which fits to a two-element parallel RC model. Both, the power law and general effective media (GEM) models predict similar percolation thresholds, but the GEM model is more general and adequately reproduces the whole electrical curve for all filler concentrations.
KW - Electrical properties
KW - Graphene
KW - Graphenic nanocomposites
KW - Material modelling
UR - http://www.scopus.com/inward/record.url?scp=85176505926&partnerID=8YFLogxK
U2 - 10.1016/j.diamond.2023.110582
DO - 10.1016/j.diamond.2023.110582
M3 - Artículo
AN - SCOPUS:85176505926
SN - 0925-9635
VL - 141
JO - Diamond and Related Materials
JF - Diamond and Related Materials
M1 - 110582
ER -