@conference{
author = "Mravik, Željko and Pejčić, Milica and Jovanović, Sonja and Petković, Darija and Stević, Miša and Stević, Zoran and Jovanović, Zoran",
year = "2023",
abstract = "Kompoziti nanomaterijala različitih dimenzionalnosti (2D, 1D i 0D) predstavljaju okosnicu razvoja budućih naprava. U našem istraživanju posebna pažnja usmerena je na elektrohemijske superkondenzatore i senzore, pri čemu su nanokompoziti 2D (grafen oksid, GO) i 0D (12- volframfosforna kiselina, WPA) materijala jedni od najperspektivnijih kandidata za ove primene. U ovom radu tanak film GO i GO/WPA formiran je potapanjem interdigitalnih elektroda u suspenziju materijala i postepenim izvlačenjem, pod uglovima od 30° i 45°, sa korakom od 20 μm i sa pauzom između koraka od 60, 120 i 180 sekundi. Optičkom mikroskopijom ocenjen je kvalitet i morfologija GO i GO/WPA filma pre i posle termičke redukcije, dok su merenja impedansne spektroskopije izvršena korišćenjem LCR analizatora. Rezultati optičke mikroskopije su pokazali najuniformniju pokrivenost uzorka sa najdužom pauzom između koraka. U slučaju GO deponovanog pod uglom od 30°, uzorci sa vremenom depozicije od 180 sekundi pokazali su smanjene vrednosti impendansi, usled smanjenog udela pukotina. GO/WPA kompozit sa pauzom između koraka od 60 sekundi pod uglom od 30° pokazao je najbolja svojstva. Uvođenje WPA u materijal rezultiralo je smanjenjem vrednosti otpornosti, povećavajući njegovu mogućnost primene u elektronskim uređajima., Composites of nanomaterials with various dimensionalities (2D, 1D, and 0D) represent the cornerstone of future device development. Our investigation places particular emphasis on electrochemical supercapacitors and sensors, with 2D (graphene oxide, GO) and 0D (12- tungstophosphoric acid, WPA) nanocomposites being among the most promising candidates for these applications. In this study, a thin film of GO and GO/WPA was formed by immersing interdigital electrodes in a material suspension and gradually withdrawing them at angles of 30° and 45°, with a 20-μm step and dwell time of 60, 120, and 180 seconds. Optical microscopy was employed to assess the quality and morphology of the GO and GO/WPA films before and after thermal reduction, while impedance spectroscopy measurements were carried out using an LCR analyzer. The results of optical microscopy demonstrated the most uniform sample coverage with the longest dwell time. In the case of GO deposited at a 30° angle, samples with a dwell time of 180 seconds exhibited reduced impedance values due to a decreased presence of cracks. The GO/WPA composite with a 60-second dwell time at a 30° angle exhibited the best properties. The introduction of WPA into the material resulted in a reduction of resistance values, increasing its potential for use in electronic devices.",
publisher = "Belgrade : Union of Mechanical and
Electrotechnical Engineers and
Technicians of Serbia (SMEITS) : Society for Renewable Electrical Power Sources ",
journal = "11th International Conference on Renewable Electrical Power Sources : Proceedings",
title = "Električna svojstva tankih filmova GO i GO/WPA na intergdigitalnim elektrodama, Electrical properties of GO and GO/WPA thin films on interdigital electrodes",
pages = "45-51",
url = "https://hdl.handle.net/21.15107/rcub_vinar_13494"
}