Tunable dielectric characteristics of the nanocomposite diode based on functionalized graphene quantum dots with and without gadolinium

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dc.authoridYıldız, Mustafa / 0000-0001-5833-7499
dc.contributor.authorBerktaş, Zeynep
dc.contributor.authorAnter, Aslıhan
dc.contributor.authorDikicioğlu, Elanur
dc.contributor.authorUlusoy, Murat
dc.contributor.authorCandan, Can
dc.contributor.authorYıldız, Mustafa
dc.contributor.authorDi Bartolomeo, Antonio
dc.date.accessioned2025-01-27T20:47:23Z
dc.date.available2025-01-27T20:47:23Z
dc.date.issued2024
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractIn this study, we have separately synthesized and characterized solutions of gadolinium (Gd)-free and Gd-doped polyethyleneimine (PEI)-functionalized graphene quantum dots (GQDs) due to the excellent properties of Gd, a rare earth element, in fluorescence and magnetic resonance imaging (MRI). The dielectric properties of Gd-free/ doped nanocomposite-based diodes have been compared using impedance spectroscopy (IS) in the frequency range from 1 kHz to 500 kHz and voltage range from -3 V to +5 V at 300 K. From our experimental results, the Gd-free diode was found to have a negative dielectric constant (e '). In contrast, the Gd-doped nanocomposite diode exhibited positive e '. The epsilon ' of the Gd-free diode is -80, while the e ' of the Gd-doped diode is 35 at 5 V for 1 kHz. The experimental results showed that the dielectric properties of both structures were strongly dependent on the applied voltage and frequency. The Gd doping in the interface has prevented the domination of loss mechanisms within the structure, eliminated negative dielectric at lower frequencies, and conferred a unique micro-capacitor characteristic to the structure. All these efforts will contribute to the development of functional carbon-based materials and the creation of new electronic devices and tunable dielectric properties.
dc.description.sponsorshipGazi University Scientific Research Council (BAP) [FGA-2022-8252]
dc.description.sponsorshipE.O. is grateful to the Gazi University Scientific Research Council (BAP) for the financial support of this research under project FGA-2022-8252. The authors are grateful to the Gazi University Electro-Optic Research Laboratory.
dc.identifier.doi10.1016/j.surfin.2024.104742
dc.identifier.issn2468-0230
dc.identifier.scopus2-s2.0-85199185849
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.surfin.2024.104742
dc.identifier.urihttps://hdl.handle.net/20.500.12428/24875
dc.identifier.volume51
dc.identifier.wosWOS:001279107400001
dc.identifier.wosqualityN/A
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofSurfaces and Interfaces
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectGraphene quantum dots (GQDs)
dc.subjectGadolinium free/doped GQDs nanocomposite
dc.subjectPositive/negative dielectric constants
dc.titleTunable dielectric characteristics of the nanocomposite diode based on functionalized graphene quantum dots with and without gadolinium
dc.typeArticle

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