Defect-induced room temperature ferromagnetism in Fe and Na co-doped ZnO nanoparticles

Gu, Haoshuang; Jiang, Yinzhu; Yan, Mi

doi:10.1016/j.jallcom.2012.01.043

Cited by 32 publications

(13 citation statements)

References 43 publications

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“…Although several studies have been proposed, the origin of ferromagnetism in transition meatl-doped ZnO remains very controversial. Similar contradictory results were also observed in Fe-doped ZnO nanomaterials [ 31 – 33 ]. Sharma et al [ 34 ] demonstrated that 0.01 Fe-doped ZnO samples show a diamagnetic character, while ferromagnetic nature is observed for 0.02 and 0.03 Fe-doped samples, and the higher doping of Fe.…”

Section: Introductionsupporting

confidence: 80%

Structural and Magnetic Properties of Transition-Metal-Doped Zn 1−x Fe x O

Abdel‐Baset

Fang

Anis³

et al. 2016

Nanoscale Res Lett

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The ability to produce high-quality single-phase diluted magnetic semiconductors (DMS) is the driving factor to study DMS for spintronics applications. Fe-doped ZnO was synthesized by using a low-temperature co-precipitation technique producing Zn 1−xFexO nanoparticles (x= 0, 0.02, 0.04, 0.06, 0.08, and 0.1). Structural, Raman, density functional calculations, and magnetic studies have been carried out in studying the electronic structure and magnetic properties of Fe-doped ZnO. The results show that Fe atoms are substituted by Zn ions successfully. Due to the small ionic radius of Fe ions compared to that of a Zn ions, the crystal size decreases with an increasing dopant concentration. First-principle calculations indicate that the charge state of iron is Fe 2+ and Fe 3+ with a zinc vacancy or an interstitial oxygen anion, respectively. The calculations predict that the exchange interaction between transition metal ions can switch from the antiferromagnetic coupling into its quasi-degenerate ferromagnetic coupling by external perturbations. This is further supported and explains the observed ferromagnetic bahaviour at magnetic measurements. Magnetic measurements reveal that decreasing particle size increases the ferromagnetism volume fraction. Furthermore, introducing Fe into ZnO induces a strong magnetic moment without any distortion in the geometrical symmetry; it also reveals the ferromagnetic coupling.

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Section: Introductionsupporting

confidence: 80%

Structural and Magnetic Properties of Transition-Metal-Doped Zn 1−x Fe x O

Abdel‐Baset

Fang

Anis³

et al. 2016

Nanoscale Res Lett

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“…48 While the peaks at 712.1 and 724.8 eV are assigned to the Fe 2p 3/2 and Fe 2p 1/2 of Fe 2 O 3 . 48,49 The other elements, such as Cr, Si and Mn were not displayed obviously in the survey spectrum, but clearly observed in the high resolution XPS spectra (Fig. S2 †).…”

Section: Characterization Of Materialsmentioning

confidence: 97%

Nickel foam and stainless steel mesh as electrocatalysts for hydrogen evolution reaction, oxygen evolution reaction and overall water splitting in alkaline media

et al. 2019

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“…[17] The binding energies of Fe 2p 3/2 and 2p 1/2 at about 706.8 and 719.9 eV, respectively, which are corresponded to metallic Fe 0 (Figure 2d). [18] Moreover, the valence states of Ce in the two specimens are mainly Ce 3+ and a few amount of Ce 4+ (Figure 2e), because the two pairs of the peaks noted as (V 1 , U 1 ) and (V, U) are similar to those of Ce 2 O 3 and CeO 2 . [19] Thus, based on the XRD and XPS results, the synthesized Ni 0.5 Fe 0.5 -CeO x /MIL-101 is regarded as the composite of Ni 0.5 Fe 0.5 nanoalloy and CeO x supported on the MIL-101.…”

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confidence: 89%

Complete Dehydrogenation of N₂H₄BH₃ over Noble‐Metal‐Free Ni_0.5Fe_0.5–CeO_x/MIL‐101 with High Activity and 100% H₂ Selectivity

Wang

Wulan

et al. 2018

Advanced Energy Materials

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Efficient and selective dehydrogenation of hydrazine borane (HB), a novel hydrogen storage material with very high hydrogen content (HB, 15.4 wt%), is a key challenge for a fuel‐cell‐based hydrogen economy. However, even using the noble metal catalysts for HB decomposition, the activities are still far from satisfying, to say nothing of non‐noble‐metal‐containing catalysts. In response, as a proof‐of‐concept experiment, herein, noble‐metal‐free NiFe–CeOx nanoparticles are successfully immobilized on an MIL‐101 support without surfactant by a simple liquid impregnation method. Unexpectedly, the resultant Ni0.5Fe0.5–CeOx/MIL‐101 catalyst shows good performance, including 100% H2 selectivity, 100% conversion, and record catalytic activity (351.3 h−1) for hydrogen generation at mild temperature, which is even better than most of the noble metal heterogeneous catalysts and might be attributed to the good dispersion and uniform particle size of the Ni0.5Fe0.5–CeOx nanoparticles due to steric restrictions effect of the MIL‐101 support. Additionally, extending MIL‐101 to some other important kinds of metal–organic framework (MOF) structures, the resultant NiFe–CeOx/MOF catalysts all show good catalytic activity toward HB decomposition, showing the universality of the MOF supported NiFe–CeOx catalysts.

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Defect-induced room temperature ferromagnetism in Fe and Na co-doped ZnO nanoparticles

Cited by 32 publications

References 43 publications

Structural and Magnetic Properties of Transition-Metal-Doped Zn 1−x Fe x O

Structural and Magnetic Properties of Transition-Metal-Doped Zn 1−x Fe x O

Nickel foam and stainless steel mesh as electrocatalysts for hydrogen evolution reaction, oxygen evolution reaction and overall water splitting in alkaline media

Complete Dehydrogenation of N₂H₄BH₃ over Noble‐Metal‐Free Ni_0.5Fe_0.5–CeO_x/MIL‐101 with High Activity and 100% H₂ Selectivity

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Defect-induced room temperature ferromagnetism in Fe and Na co-doped ZnO nanoparticles

Cited by 32 publications

References 43 publications

Structural and Magnetic Properties of Transition-Metal-Doped Zn 1−x Fe x O

Structural and Magnetic Properties of Transition-Metal-Doped Zn 1−x Fe x O

Nickel foam and stainless steel mesh as electrocatalysts for hydrogen evolution reaction, oxygen evolution reaction and overall water splitting in alkaline media

Complete Dehydrogenation of N2H4BH3 over Noble‐Metal‐Free Ni0.5Fe0.5–CeOx/MIL‐101 with High Activity and 100% H2 Selectivity

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Complete Dehydrogenation of N₂H₄BH₃ over Noble‐Metal‐Free Ni_0.5Fe_0.5–CeO_x/MIL‐101 with High Activity and 100% H₂ Selectivity