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dc.creatorRadovanović, Lidija
dc.creatorVulić, Predrag
dc.creatorRadovanović, Željko
dc.creatorBalanč, Bojana
dc.creatorSimović, Bojana
dc.creatorZeković, Ivana
dc.creatorDramićanin, Miroslav
dc.creatorRogan, Jelena
dc.date.accessioned2021-03-10T13:37:55Z
dc.date.available2021-03-10T13:37:55Z
dc.date.issued2018
dc.identifier.isbn978-86-7025-785-6
dc.identifier.urihttp://TechnoRep.tmf.bg.ac.rs/handle/123456789/3800
dc.description.abstractTransition metal oxides are important materials that have found many applications, as capacitors, sensors or in energy storage [1]. Synthesis of these compounds has been realized by various methods, such as hydro(solvo)thermal synthesis, precipitation, microwave synthesis or sol-gel synthesis [2]. Recently, the thermolysis of coordination compounds as precursors has been considered as a new approach in obtaining functional nanosized materials. [3]. In this way, by selecting the proper precursor, it is possible to control the phase composition, morphology and particle size of a resulting material [3]. The biphasic powder composed of ZnO (zincite) and ZnMn2O4 (hetaerolite), (I) has been obtained by thermolysis of bimetallic complex [MnZn2(dipya)3(tpht)3(H2O)4]·2H2O (dipya = 2,2’-dipyridylamine, tpht = dianion of 1,4-benzenedicarboxylic acid) at 450 °C during 1 h in air atmosphere. Scanning Electron Microscopy (SEM) was used to investigate the morphology of I (Figure 1). It can be observed that the morphology consists of deformed spherical grains of ZnO with an average diameter of 67 nm and elliptical grains of hetaerolite whose average diameter and length were 156 and 290 nm, respectively. The X-ray powder diffraction (XRPD) was applied to investigate the structure of I. In Figure 2 two-phase Rietveld refinement pattern of I is presented (ZnO to ZnMn2O4 phase-ratio of 62:38 wt. %). The main crystallographic data and Rietveld refinement parameters for ZnO phase are: hexagonal, space group P63mc, a = 3.2574(1), c = 5.2175(2) Å, V = 47.945(3) Å3 ; for ZnMn2O4 phase are: tetragonal, space group I41/amd, a = 5.7299(3), c = 9.3000(8) Å, V = 305.34(3) Å3 ; Rwp = 4.80 %, Rp = 3.82 %, Rexp = 3.80 % and χ2 = 1.5960. UVVis-NIR absorption spectrum was measured in order to investigate the direct band gap (Eg) of I. Due to the existence of two phases in I, two different Eg values of 2.4 and 3.3 eV for ZnMn2O4 and ZnO phase, respectively, were determined using Kubelka-Munk function. The mean size, polydispersity index (PDI) and zeta potential of spherical grains were measured using Zetasizer Nano Series, Nano ZS. The mean size was 418.6±53.1 nm while PDI value was found to be 0.354±0.099. Relatively high values of PDI and low apostate value of zeta potential (–6.55 mV) are indications of incipient instability of colloidal dispersion of I, probably due to the formation of agglomerates [4, 5]. Photoluminescence measurements were carried out at room temperature on Fluorolog-3 Model FL3-221 spectrofluorimeter system upon excitation at 350 nm, in order to study the optical properties of I. This analysis revealed one band centred at 422 nm in the blue region of the visible part of the spectrum, which can possibly be associated with defects in the crystal structure of the ZnO phase [6].
dc.publisherBelgrade : Serbian Academy of Sciences and Arts
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/45007/RS//
dc.rightsopenAccess
dc.rights.urihttps://creativecommons.org/licenses/by-sa/4.0/
dc.sourceProgram and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia
dc.titleSynthesis, Structure, Morphology and Properties of Biphasic ZnO–ZnMn2O4en
dc.typeconferenceObject
dc.rights.licenseBY-SA
dc.citation.epage173
dc.citation.other: 171-173
dc.citation.spage171
dc.identifier.fulltexthttp://TechnoRep.tmf.bg.ac.rs/bitstream/id/1613/3797.pdf
dc.identifier.rcubhttps://hdl.handle.net/21.15107/rcub_vinar_8737
dc.type.versionpublishedVersion


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