Room temperature ferromagnetism in sol–gel prepared Co-doped ZnO

Varshney, Prateek; Srinet, Gunjan; Kumar, Rohit; Sajal, Vivek; Sharma, S. K.; Knobel, M.; Chandra, Jagdish; Gupta, Govind; Kulriya, P.K.

doi:10.1016/j.mssp.2012.02.002

Cited by 21 publications

(11 citation statements)

References 21 publications

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“…These methods contain pulsed laser deposition [18], rf magnetron sputtering [19], spray pyrolysis [20], sol-gel [21] and vapor phase transport method (VPT) [22]. Within all these methods, VPT method is considerably used due to the simple and low-cost equipment and has been utilized to grow ZnO nanostructures of diverse morphology with excellent crystalline and optical quality [23].…”

Section: Introductionmentioning

confidence: 99%

Defect-mediated ferromagnetism in ZnO:Mn nanorods

et al. 2013

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In this work, the structural, chemical and magnetic properties of ZnO:Mn nanorods were investigated. Firstly, well-aligned ZnO nanorods with their long axis parallel to the crystalline c-axis were successfully grown by the vapor phase transport technique on Si substrates coated with a ZnO buffer layer. Mn metal was then diffused into these nanorods at different temperatures in vacuum. From SEM results, ZnO:Mn nanorods were observed to have diameters of ~100 nm and lengths of 4 µm. XPS analysis showed that the Mn dopant substituted into the ZnO matrix with a valence state of +2. Magnetic measurements performed at room temperature revealed that undoped ZnO nanorods exhibit ferromagnetic behavior which may be related to oxygen vacancy defect-mediated d 0 ferromagnetism. ZnO:Mn samples were seen to show an excess room temperature ferromagnetism that is attributed to the presence of oxygen vacancy defects forming bound magnetic polarons involving Mn.

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Section: Introductionmentioning

confidence: 99%

Defect-mediated ferromagnetism in ZnO:Mn nanorods

et al. 2013

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“…On the other hand, it uses organic solvents, expensive reagents and the control of pH and temperature are also necessary and generally more than one phase of cobalt oxide is produced together 31,32,33 This work reports the synthesis of Co 3 O 4 nanopowder by an adapted sol-gel method, previously published by our research group 34 . The oxide obtained was characterized physically by techniques of infrared spectroscopy, X-ray diffraction, Raman spectroscopy and transmission electron microscopy.…”

Section: Introductionmentioning

confidence: 99%

Pseudocapacitance Properties of Co3O4 Nanoparticles Synthesized Using a Modified Sol-Gel Method

et al. 2018

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This work reports the synthesization of nanoparticles cobalt oxide (Co 3 O 4 ) with no secondary phase by a modified sol-gel method and its structural morphological and electrochemical characterizations. FTIR, XRD and Raman analysis showed the formation of spinel cobalt oxide with no secondary phase. TEM images revealed that an undefined morphology with average crystallite size estimated by Scherrer's equation was found to be 30 nm. Experiments of cyclic voltametric, galvanostatic chargedischarge and impedance spectroscopy were evaluated at 1 mol L -1 KOH and revealed an intrinsic pseudocapacitance. The studies of complex capacitance and complex power revealed the resistive and capacitive characteristics with a specific capacitance of 120 F g -1 .

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“…Therefore, cautious investigations are expected to set up the intrinsic and robust magnetism [26][27][28][29]. The present work focuses on repercussions of hydrogenation and then re-heating of Co-doped ZnO and In 2 O 3 specimens.…”

Section: Introductionmentioning

confidence: 99%

Study of the hydrogenation and re-heating of Co-doped ZnO and In2O3 Nano composites

Mukherji

Mathur

Samariya

et al. 2018

Adv Compos Hybrid Mater

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Nanocomposite samples of zinc oxide (ZnO) and indium oxide (In 2 O 3 ) doped with Co (at 1.5% molar concentration) are synthesized through conventional solid-state reaction technique. These samples are taken in a quartz tube and placed in reduction furnace for post-annealing in the presence of hydrogen for~10 h at around 550°C. The X-ray diffraction (XRD) study confirms the formation of hexagonal wurtzite structure for ZnO, Zn H exhibited a perceptible ferromagnetic behavior at 300 K whereas it overturns significantly after long air sintering. An effort has been made to fit the experiential M-H data of hydrogenated samples to the Bound Magnetic Polaron (BMP) model. MATLAB-based simulations have been performed to validate the homogeneity in particle distribution of the samples evinced through SEM micrographs. A multivariate assessment viz. hierarchical cluster analysis is also executed to corroborate and strengthen the experimental findings of magnetic properties.

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Room temperature ferromagnetism in sol–gel prepared Co-doped ZnO

Cited by 21 publications

References 21 publications

Defect-mediated ferromagnetism in ZnO:Mn nanorods

Defect-mediated ferromagnetism in ZnO:Mn nanorods

Pseudocapacitance Properties of Co3O4 Nanoparticles Synthesized Using a Modified Sol-Gel Method

Study of the hydrogenation and re-heating of Co-doped ZnO and In2O3 Nano composites

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