Enhancement of zinc vacancies in room-temperature ferromagnetic Cr–Mn codoped ZnO nanorods synthesized by hydrothermal method under high pulsed magnetic field

Zhong, Min; Liu, Ying; Hu, Yemin; Li, Wenxian; Jin, Hongmin; Wang, Shiwei; Li, Yibing; Zhao, Huijun

doi:10.1016/j.jallcom.2015.06.072

Cited by 21 publications

(3 citation statements)

References 52 publications

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“…It has been reported that in Fe-doped ZnO nanocrystals, Fe 3+ appeared when Zn vacancies were present near the substitutional sites to neutralize the charge imbalance [ 34 ]. A similar phenomenon has also been reported for the observation of Cr 3+ ions in Cr-Mn-doped ZnO under magnetic annealing [ 35 ].…”

Section: Resultssupporting

confidence: 84%

Improved Resistance Switching Stability in Fe-Doped ZnO Thin Films Through Pulsed Magnetic Field Annealing

Xiahou

et al. 2017

Nanoscale Res Lett

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Five percent of Fe-doped ZnO (ZnO:Fe) thin films were deposited on Pt/TiO2/SiO2/Si substrates by a spin-coating method. The films were annealed without (ZnO:Fe-0T) and with a pulsed magnetic field of 4 T (ZnO:Fe-4TP) to investigate the magnetic annealing effect on the resistance switching (RS) behavior of the Pt/ZnO:Fe/Pt structures. Compared with the ZnO:Fe-0T film, the ZnO:Fe-4TP film showed improved RS performance regarding the stability of the set voltage and the resistance of the high resistance state. Transmission electron microscopy and X-ray photoelectron spectroscopy analyses revealed that the ZnO:Fe-4TP film contains more uniform grains and a higher density of oxygen vacancies, which promote the easier formation of conducting filaments along similar paths and the stability of switching parameters. These results suggest that external magnetic fields can be used to prepare magnetic oxide thin films with improved resistance switching performance for memory device applications.

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Section: Resultssupporting

confidence: 84%

Improved Resistance Switching Stability in Fe-Doped ZnO Thin Films Through Pulsed Magnetic Field Annealing

Xiahou

et al. 2017

Nanoscale Res Lett

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“…It was observed that the Fe-MOF and Co-MOF get converted into Fe 2 O 3 and Co(OH) 2 ; however, the Co 0.5 Fe 0.5 -MOF forms a mixture of Fe 2 O 3 and Co(OH) 2 , and the Co 0.25 Fe 0.75 -MOF transferred into Co-doped Fe 2 O 3 (as the shift in the diffraction pattern of Fe 2 O 3 toward lower 2θ) . Likewise, the diffraction pattern of Co 0.75 Fe 0.25 -MOF shows little shift to the higher value of 2θ proving the formation of Fe-doped Co(OH) 2 after the first LSV scan . Not only the crystal structure but also the surface morphology of the MOFs observed to be changed after the first LSV scan.…”

Section: Resultsmentioning

confidence: 99%

“…48 Likewise, the diffraction pattern of Co 0.75 Fe 0.25 -MOF shows little shift to the higher value of 2θ proving the formation of Fe-doped Co(OH) 2 after the first LSV scan. 49 Not only the crystal structure but also the surface morphology of the MOFs observed to be changed after the first LSV scan. As can be seen in Figure 3b−g, the morphology of Co-MOF, Co 0.75 Fe 0.25 -MOF, and Fe-MOF transformed into large hexagonal plates, very thin small flakes, and spherical nanoparticles, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Impact of Iron in Three-Dimensional Co-MOF for Electrocatalytic Water Oxidation

2021

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The integration of iron (Fe) into a cobalt metal− organic framework (Co-MOF) tunes the electronic structure of the parent MOF as well as enhances their electrocatalytic characteristics. By using pyrazine and hydrofluoric acid, we have synthesized threedimensional Co-MOF [CoFC 4 H 4 N 2 (SO 4 ) 0.5 ], (1), and Fe-MOF [FeFC 4 H 4 N 2 (SO 4 ) 0.5 ], (2), through a single-step solvothermal method. Further, a series of bimetallic (having both Co and Fe metal centers) MOFs [Co 1−x Fe x FC 4 H 4 N 2 (SO 4 ) 0.5 ] were synthesized with variable concentrations of Fe, and their electrocatalytic performances were analyzed. The optimized amount of Fe significantly impacted the electrocatalytic behavior of the bimetallic MOF toward water oxidation. Particularly, the Co 0.75 Fe 0.25 -MOF needs only 239 and 257 mV of overpotential to deliver 10 and 50 mA/cm 2 current density, respectively, in alkaline electrolytic conditions. The Co 0.75 Fe 0.25 -MOF shows a lower Tafel slope (42 mV/ dec.) among other bimetallic MOFs and even the commercial RuO 2 , and it has excellent durability (with ∼8 mV increases in overpotential after 18 h of electrolysis) and 97.05% Faradaic efficiency, which further evident its catalytic excellency. These findings explore the intrinsic properties of MOF-based electrocatalysts and prospect the suitability for future water electrolysis.

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Room Temperature Ferromagnetism Enhanced in Al‐Doped ZnO by Pulsed Magnetic Field Processing

Tariq

et al. 2019

Crystal Research and Technology

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Al-doped ZnO diluted magnetic semiconductor with hexagonal wurtzite structure is synthesized by hydrothermal method under 4 T (Tesla) pulsed magnetic field. High-pulsed magnetic field processing promotes the substitution proportion of Al for Zn sites in ZnO lattice, which the processed sample performs better room temperature ferromagnetism (RTFM). The improvement of RTFM in Al-doped ZnO is mainly on account of induced F centers in ZnO lattice by increased oxygen vacancies.

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Enhancement of zinc vacancies in room-temperature ferromagnetic Cr–Mn codoped ZnO nanorods synthesized by hydrothermal method under high pulsed magnetic field

Cited by 21 publications

References 52 publications

Improved Resistance Switching Stability in Fe-Doped ZnO Thin Films Through Pulsed Magnetic Field Annealing

Improved Resistance Switching Stability in Fe-Doped ZnO Thin Films Through Pulsed Magnetic Field Annealing

Impact of Iron in Three-Dimensional Co-MOF for Electrocatalytic Water Oxidation

Room Temperature Ferromagnetism Enhanced in Al‐Doped ZnO by Pulsed Magnetic Field Processing

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