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      Unraveling the effect of Gd doping on the structural, optical, and magnetic properties of ZnO based diluted magnetic semiconductor nanorods†

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      RSC Advances
      The Royal Society of Chemistry

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          Abstract

          The structural, magnetic, and optical properties of the pristine and Gd-doped ZnO nanorods (NRs), prepared by facile thermal decomposition, have been studied using a combination of experimental and density functional theory (DFT) with Hubbard U correction approaches. The XRD patterns demonstrate the single-phase wurtzite structure of the pristine and doped ZnO. The rod-like shape of the nanoparticles has been examined by FESEM and TEM techniques. Elemental compositions of the pure and doped samples were identified by EDX measurement. Due to the Burstein–Moss shift, the optical band gaps of the doped samples have been widened compared to pristine ZnO. The PL spectra show the presence of complex defects. Room temperature magnetic properties have been measured using VSM and revealed the coexistence of paramagnetic and weak ferromagnetic ordering in Gd 3+ doped ZnO-NRs. The magnetic moment was increased upon addition of more Gd ions into the ZnO host lattice. The DFT+U calculations confirm that the presence of vacancy-complexes has a significant effect on the structural, electronic, and magnetic properties of a pristine ZnO system.

          Abstract

          Gd doped ZnO nanorods.

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          From ultrasoft pseudopotentials to the projector augmented-wave method

          Physical Review B, 59(3), 1758-1775
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            First principles methods using CASTEP

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              Nanobelts of semiconducting oxides.

              Ultralong beltlike (or ribbonlike) nanostructures (so-called nanobelts) were successfully synthesized for semiconducting oxides of zinc, tin, indium, cadmium, and gallium by simply evaporating the desired commercial metal oxide powders at high temperatures. The as-synthesized oxide nanobelts are pure, structurally uniform, and single crystalline, and most of them are free from defects and dislocations. They have a rectanglelike cross section with typical widths of 30 to 300 nanometers, width-to-thickness ratios of 5 to 10, and lengths of up to a few millimeters. The beltlike morphology appears to be a distinctive and common structural characteristic for the family of semiconducting oxides with cations of different valence states and materials of distinct crystallographic structures. The nanobelts could be an ideal system for fully understanding dimensionally confined transport phenomena in functional oxides and building functional devices along individual nanobelts.
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                Author and article information

                Journal
                RSC Adv
                RSC Adv
                RA
                RSCACL
                RSC Advances
                The Royal Society of Chemistry
                2046-2069
                16 October 2019
                15 October 2019
                16 October 2019
                : 9
                : 57
                : 33207-33221
                Affiliations
                [a] Department of Ceramic, College of Materials Engineering, University of Babylon 51002 Hilla Iraq m.obeid8686@ 123456gmail.com +9647812307281
                [b] Department of Physics, College of Education for Pure Sciences, University of Babylon Hilla Iraq
                Author information
                https://orcid.org/0000-0001-7595-4982
                https://orcid.org/0000-0002-9996-1279
                https://orcid.org/0000-0002-6639-2962
                Article
                c9ra04750f
                10.1039/c9ra04750f
                9073360
                35529138
                155581a3-a396-418b-a541-08f70d74200a
                This journal is © The Royal Society of Chemistry
                History
                : 24 June 2019
                : 11 October 2019
                Page count
                Pages: 15
                Categories
                Chemistry
                Custom metadata
                Paginated Article

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