Room-temperature ferromagnetism in Co-doped ZnO bulk induced by hydrogenation

Wang, Yi; Sun, Lei; Kong, Linggang; Kang, Jinfeng; Zhang, Xing; Han, Ruqi

doi:10.1016/j.jallcom.2005.12.118

Cited by 58 publications

(46 citation statements)

References 7 publications

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“…They are assigned to the lattice zinc in zinc oxide [15]. The peak separation between these two peaks is 22.9 eV, which is well lying within the standard reference value of ZnO [16]. Figure 4b shows the O 1s region, the peak locate at 528.9 eV is attributed to the O 2-ions in the wurtzite structure, which are surrounded by zinc atoms or copper atoms with the full supplement of nearestneighbour O 2-ions.…”

Section: Methodssupporting

confidence: 54%

Optical properties of Cu-doped ZnO nanoparticles experimental and first-principles theory research

Zheng

Song

Jiang

et al. 2012

J Mater Sci: Mater Electron

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Zn 1-x Cu x O nanoparticles were synthesized by using sol-gel method. Structure and optical properties of Zn 1-x Cu x O nanoparticles were studied experimentally and theoretically. The simulations are based upon the PerdewBurke-Ernzerhof form of generalized gradient approximation within the density functional theory. The results showed that the UV emission is effectively quenched and the emission in visible-light region is enhanced by Cudoping, which are theoretically explained to be attributed to the electronic intra-band transition from the occupied bands to the unoccupied ones under irradiation. Therefore, Zn 1-x Cu x O system may be a potential candidate for photocatalytic in visible light range.

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Section: Methodssupporting

confidence: 54%

Optical properties of Cu-doped ZnO nanoparticles experimental and first-principles theory research

Zheng

Song

Jiang

et al. 2012

J Mater Sci: Mater Electron

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“…ZnO has been synthesized in a variety of ways, including pulsed laser deposition [11], chemical vapor transport [12], electrodeposition [13], co-precipitation [14] and solid state reaction [15]. While simpler synthesis techniques that can be performed in ambient environment have the attraction of wider accessibility and low-cost it is, of course, very important that the (doped) ZnO thus produced is of high integrity, displaying comparable properties and competitive functionality with that produced by other means.…”

Section: Introductionmentioning

confidence: 99%

Solution-based synthesis of cobalt-doped ZnO thin films

et al. 2012

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Publisher rights This is the author's version of a work that was accepted for publication in Thin Solid Films. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Thin Solid Films, Vol. 524, 01/12/2012 General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights.Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws. If you discover content in the Research Portal that you believe breaches copyright or violates any law, please contact openaccess@qub.ac.uk. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT1 Solution-based synthesis of cobalt-doped ZnO thin films Sesha VempatiSchool of Mathematics and Physics, Queen's University Belfast, BT7 1NN, UK, Amitha ShettyMaterials Research Center, Indian Institute of Science, Bangalore -560012, India. P. Dawson*School of Mathematics and Physics, Queen's University Belfast, BT7 1NN, UK, K. K. Nanda and S.B. KrupanidhiMaterials Research Center, Indian Institute of Science, Bangalore -560012, India.Corresponding author: p.dawson@qub.ac.uk AbstractUndoped and cobalt-doped (1-4 wt%) ZnO polycrystalline, thin films have been fabricated on quartz substrates using sequential spin-casting and annealing of simple salt solutions. X-ray diffraction (XRD) reveals a wurzite ZnO crystalline structure with high-resolution transmission electron microscopy showing lattice planes of separation 0.26 nm, characteristic of (002) planes.The Co appears to be tetrahedrally co-ordinated in the lattice on the Zn sites (XRD) and has a charge of +2 in a high-spin electronic state (X-ray photoelectron spectroscopy). Co-doping does not alter the wurzite structure and there is no evidence of the precipitation of cobalt oxide phases within the limits of detection of Raman and XRD analysis. Lattice defects and chemisorbed oxygen are probed using photoluminescence and Raman spectroscopy -crucially, however, this transparent semiconduc...

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“…In the case of polycrystalline bulk Zn 1−x Co x O samples prepared by solid state reaction method, most of them exhibited a paramagnetic or even antiferromagnetic behavior at room temperature (RT). The RTFM observed in some Zn 1−x Co x O samples was typically attributed either to the generation of oxygen vacancies or to the appearance of Co clusters [4,5]. Similar explanations (or the formation of secondary phases containing Co) were proposed for bulk polycrystalline ferromagnetic samples prepared by other methods.…”

Section: Introductionmentioning

confidence: 61%