Electrical Conductivity of a Partial Interphase Governing the Charge Transfer in Carbon Nanofiber Polymer System Publisher



Zare Y ; Gharib N ; Choi JH ; Rhee KY
Source: Diamond and Related Materials Published:2026

Abstract

Polymer nanocomposites often contain a partial interphase that influences their performance; however, this aspect was rarely studied in the literature. In this work, the conductivity of a partial interphase in the composites of carbon nanofiber (CNF) named as PCNFs is analyzed based on CNF properties and the magnitude of conduction moving via the partial interphase. Additionally, percolation inception, network ratio, and tunneling zone resistance are examined, assuming the formation of CNF/partial interphase networks. A conductivity model for PCNFs is then developed using these factors. The parameters in the equations for interphase conductivity (ψ), net proportion, and composite conductivity are evaluated and explained. Similarly, experimental data are provided to validate the developed equations for percolation inception and PCNF conductivity. Increased conduction transfer through the partial interphase, reduced CNF waviness, and the slimmer and longer nanofibers enhance interphase conductivity and network formation, leading to improved overall conductivity. An interphase size (t) of 30 nm and ψ = 1000 S/m increase nanocomposite conductivity to 0.23 S/m, whereas t < 7 nm results in an insulated PCNF. The densest interphase with the highest conductivity yields the greatest conductivity, whereas an extremely thin interphase cannot provide the charge transfer. © 2026 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.