Graphene oxide-induced free volume effects in proton conductive chitosan/polyvinyl alcohol (CS/PVA)-based composite electrolytes: a positron annihilation lifetime study

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dc.contributor.authorYılmazoğlu, Mesut
dc.contributor.authorOkkay, Hikmet
dc.contributor.authorAbacı, Ufuk
dc.contributor.authorTekay, Emre
dc.contributor.authorÇoban, Ozan
dc.contributor.authorVeziroğlu, Sümeyye
dc.contributor.authorYumak Yahşi, Ayşe
dc.contributor.authorTav, Cumali
dc.contributor.authorYahşi, Uğur
dc.date.accessioned2025-11-10T10:16:30Z
dc.date.available2025-11-10T10:16:30Z
dc.date.issued2025
dc.departmentFakülteler, Mühendislik Fakültesi, Metalurji ve Malzeme Mühendisliği Bölümü
dc.description.abstractIn this study, chitosan/polyvinyl alcohol (CS/PVA)-based composite electrolytes containing ionic liquid (IL) and graphene oxide (GO) as conductivity-enhancing additives were prepared and characterized in detail in terms of free volume (FV) parameters, mechanical strength, and proton conductivity. FV parameters were determined by positron annihilation lifetime spectroscopy (PALS) and correlated with dynamic mechanical analysis (DMA), ionic conductivity, and dielectric measurements. According to PALS analyses, the CS-5 sample (4 wt% GO) exhibited the highest FV fraction (2.45% at 40 °C) with a corresponding ortho-positronium lifetime (τ₃) of 2.12 ns, and FV hole radius (R) of 2.96 nm. This microstructural expansion was directly associated with the maximum proton conductivity of 1.64 × 10⁻3 S/m at 1 MHz, demonstrating the role of GO in facilitating continuous proton pathways. Moreover, CS-5 achieved superior structural reinforcement, with a high-temperature storage modulus of 12.38 MPa, confirming that GO simultaneously enhances both conduction and mechanical stability. The strong correlation between FV fraction and proton conductivity experimentally validates the FV-based conduction theory, offering mechanistic evidence for the design of next-generation polymer electrolytes. These results highlight that tuning FV distribution through GO optimization provides a reliable strategy for advancing solid-state biopolymer electrolytes in energy storage and environmental applications.
dc.identifier.doi10.1007/s10854-025-16027-9
dc.identifier.issn0957-4522
dc.identifier.issn1573-482X
dc.identifier.issue30
dc.identifier.scopus2-s2.0-105019520214
dc.identifier.scopusqualityN/A
dc.identifier.urihttps://doi.org/10.1007/s10854-025-16027-9
dc.identifier.urihttps://hdl.handle.net/11501/2501
dc.identifier.volume36
dc.identifier.wosWOS:001600490200006
dc.identifier.wosqualityQ2
dc.indekslendigikaynakScopus
dc.indekslendigikaynakWeb of Science
dc.institutionauthorÇoban, Ozan
dc.institutionauthorid0000-0002-1506-4619
dc.language.isoen
dc.publisherSpringer New York
dc.relation.ispartofJournal of Materials Science: Materials in Electronics
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectPoly(Vinyl Alcohol)
dc.subjectMechanical-Properties
dc.subjectTemperature
dc.subjectDependence
dc.subjectChitosan
dc.subjectImpact
dc.subjectTerms
dc.titleGraphene oxide-induced free volume effects in proton conductive chitosan/polyvinyl alcohol (CS/PVA)-based composite electrolytes: a positron annihilation lifetime study
dc.typeArticle

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