Synthesis of ZnO nanostructures by hydrothermal method

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dc.contributor.author Georgiou, P en
dc.contributor.author Kolokotronis, K en
dc.contributor.author Simitzis, J en
dc.date.accessioned 2014-03-01T01:32:02Z
dc.date.available 2014-03-01T01:32:02Z
dc.date.issued 2009 en
dc.identifier.issn 1662-5250 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/20026
dc.subject Hydrothermal method en
dc.subject SEM en
dc.subject XRD en
dc.subject ZnO nanostructures en
dc.subject.other Amorphous regions en
dc.subject.other Aqueous solutions en
dc.subject.other Atomic absorption spectroscopy en
dc.subject.other Branched structures en
dc.subject.other Hexagonal pyramids en
dc.subject.other Hydrothermal methods en
dc.subject.other Liquid Phase en
dc.subject.other Molar ratio en
dc.subject.other Non-solvents en
dc.subject.other Prismatic structures en
dc.subject.other Residence time en
dc.subject.other SEM en
dc.subject.other SEM image en
dc.subject.other Water as solvent en
dc.subject.other Wurtzites en
dc.subject.other XRD en
dc.subject.other XRD peaks en
dc.subject.other ZnO en
dc.subject.other ZnO nanostructures en
dc.subject.other Absorption spectroscopy en
dc.subject.other Atomic spectroscopy en
dc.subject.other Centrifugation en
dc.subject.other Ethanol en
dc.subject.other Hydrothermal synthesis en
dc.subject.other Lattice constants en
dc.subject.other Nanostructures en
dc.subject.other Nonionic surfactants en
dc.subject.other Organic solvents en
dc.subject.other Polyethylene glycols en
dc.subject.other Polyethylene oxides en
dc.subject.other Scanning electron microscopy en
dc.subject.other X ray diffraction en
dc.subject.other Zinc en
dc.subject.other Zinc oxide en
dc.subject.other Zinc sulfide en
dc.subject.other Amorphous materials en
dc.title Synthesis of ZnO nanostructures by hydrothermal method en
heal.type journalArticle en
heal.identifier.primary 10.4028/www.scientific.net/JNanoR.6.157 en
heal.identifier.secondary http://dx.doi.org/10.4028/www.scientific.net/JNanoR.6.157 en
heal.language English en
heal.publicationDate 2009 en
heal.abstract ZnO was synthesized by the hydrothermal method using proper aqueous solutions of ZnCl2 and NaOH, as the main raw materials, corresponding to the molar ratio of Zn2+ : OH- = 1 : 20 (solution 'A'), and a proper proportion of water as solvent, ethanol (EtOH) as non solvent and polyethylene glycol (PEG) as nonionic surfactant (solution 'B'). The reaction takes place in an autoclave at 200 degrees C for a defined period of time (1-20 h). The solid ZnO products received after centrifugation, washing and drying were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The percentage of unreacted Zn present after the reaction in the liquid phase (incumbent solution) was determined by Atomic Absorption Spectroscopy. The parameters of processing (i.e., temperature, pressure, residence time) and the raw materials parameters (i.e. proportion of Solution 'A'/mL H2O + mL EtoH, amount of PEG) influence the morphology and the dimensions of the product. Increasing the residence time from 1 h -> 3 h -> 20 h, the amorphous regions illustrated in SEM images are decreased and the number and dimensions of the obtained single or branched rods of the final product are increased. Avoiding the use of additional water, i.e. the denominator in the aforementioned ratio, mL, water, is equal to zero, but simultaneously using ethanol, the ZnO material is mainly amorphous. Increasing the amount of the additional water without ethanol, no amorphous material is observed and single rods or flowerlike/starlike structures having ends of regular hexagonal pyramid structure, are formed. Increasing the proportion of PEG, many flowerlike or starlike branched structures having ends of regular hexagonal prismatic structure, are formed. The ZnO materials having much of amorphous regions do not show XRD peaks. On the other hand, the crystalline ZnO materials show many XRD peaks, which are indexed and they correspond to the wurtzite-structured (hexagonal) ZnO. Furthermore, the lattice constants alpha and c are determined. en
heal.journalName Journal of Nano Research en
dc.identifier.doi 10.4028/www.scientific.net/JNanoR.6.157 en
dc.identifier.isi ISI:000271239000017 en
dc.identifier.volume 6 en
dc.identifier.spage 157 en
dc.identifier.epage 168 en

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