Conductive PMMA / rGO Microfibers via Solution Blow Spinning: Role of Fiber Architecture on Electrical Transport

Understanding how fibrous architectures influence charge transport remains a key challenge in conductive polymer composites, as electrical conductivity in fiber mats depends not only on conductive filler content but also on the connectivity and organization of the porous fiber network. This study explores the interplay between morphology, network architecture, and electrical transport in reduced graphene oxide (rGO)‐containing polymethyl methacrylate (PMMA) microfibers fabricated by solution blow spinning (SBS). PMMA/rGO mats containing 0.5, 1, and 2 wt% rGO were characterized by scanning electron microscopy, micro‐computed tomography, X‐ray diffraction, Raman spectroscopy, X‐ray photoelectron spectroscopy, and four‐point‐probe measurements, with results compared to composition‐matched cast films. Characterization analyses revealed that increasing rGO loading influences fiber morphology and network organization, producing variations in surface characteristics, packing density, and the formation of a heterogeneous, randomly oriented conductive network. Electrical conductivity increased from 0.00156 S/m at 0.5 wt% to 0.00986 S/m at 2 wt%, suggesting that conductive pathways develop through changes in fiber architecture and filler distribution rather than filler concentration alone. These findings provide new insight into architecture‐property relationships in SBS‐processed composites and establish PMMA/rGO microfibers as lightweight materials with tunable electrical properties for flexible electronics, sensing, and filtration applications.