Controlled growth of Ni/NiO composite nanoparticles and its influence on exchange anisotropy and spin glass features

Bhanuchandar, S.; Vinothkumar, G.; Arunkumar, P.; Sribalaji, M.; Keshri, Anup Kumar; Babu, K. Suresh

doi:10.1016/j.jallcom.2018.11.330

Cited by 21 publications

(8 citation statements)

References 41 publications

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“…The EDX results support the Ni/NiO interpretation, as an increased presence of oxygen in the porous region was found, where nickel was present. Ferromagnetic/antiferromagnetic interactions, and specifically the Ni/NiO system, are a high interest topic in recent years [42][43][44], and this encourages future investigation of this aspect in our results.…”

Section: Resultsmentioning

confidence: 60%

Magnetic properties of nickel electrodeposited on porous GaN substrates with infiltrated and laminated connectivity

Grishchenko¹,

Dawson²,

Ghosh³

et al. 2021

Preprint

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Multifunctional semiconductors widen the application scope of existing semiconductor devices. Here we report on the ferromagnetic/semiconductor coupling obtained through nickel and porous-GaN composites. We realised nickel-infiltrated and nickel-coated porous-GaN structures, and examined the subsequent magnetic and magnetotransport properties. We found that the magnetization of the porous-GaN/Ni composites strongly depended on the amount of deposited nickel and evolves from relatively isotropic and remanent (up to 90% remanent-to-saturation magnetization) response to an anisotropic response characteristic of thin-films. The magnetoresistance of nickel sputter-coated porous-GaN structures was measured at 300 and 200 K. The temperature dependant measurements suggested that transport in the GaN layers is dominating the current. Nonetheless, depending on sample pore size, the magnetoresistance displayed high (12-fold) out-of-plane/in-plane anisotropy, and significant hysteresis. These results are uncharacteristic of GaN transport and point towards magneto-piezo-resistive coupling between the nickel and the porous GaN. These results encourage deeper investigation of magnetic nanostructure property tuning and of magnetic property coupling to GaN and similar materials.

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Section: Resultsmentioning

confidence: 60%

Magnetic properties of nickel electrodeposited on porous GaN substrates with infiltrated and laminated connectivity

Grishchenko¹,

Dawson²,

Ghosh³

et al. 2021

Preprint

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“…Figure 3B shows the Raman spectra of the Ni@NiO‐45 product. The strong peak at 532.9 cm −1 belongs to the one‐phonon longitudinal optical vibrational mode of NiO (1LO), which is related with the huge amount of surface defects in the sample 49,57,58 . The other Raman scattering at 1043.6 cm −1 can be ascribed to the two‐phonon vibrational mode of NiO (2LO) 59 .…”

Section: Resultsmentioning

confidence: 97%

“…Furthermore, as shown in Figure 2Ci,iv, the lattice spacing in inverse FFT increases to 0.213 nm, and some broken edge dislocations can be observed, suggesting a disordered lattice structure and providing the corroborating evidence of the existence of surface defects in NiO phases. The abundant oxygen defects on the surface is normally expected in the procedure of oxidation of ferromagnetic Ni sites 49,50 . Large number of surface defects resulting from the in situ oxidation process is favorable to suppress the charge transfer resistance and improve the Li ions diffusion capability 51 .…”

Section: Resultsmentioning

confidence: 99%

“…The abundant oxygen defects on the surface is normally expected in the procedure of oxidation of ferromagnetic Ni sites. 49,50 Large number of surface defects resulting from the in situ oxidation process is favorable to suppress the charge transfer resistance and improve the Li ions diffusion capability. 51 During charge/discharge cycles, the remaining Al at a low content level is able to contribute to the improvement in electronic conductivity and reaction kinetics to some extent.…”

Section: Resultsmentioning

confidence: 99%

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Eutectic‐derived bimodal porous Ni@ NiO nanowire networks for high‐performance Li‐ion battery anodes

Luo

Wang

Chen

et al. 2022

Intl J of Energy Research

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Summary Severe mechanical degradations and sluggish ion/electron migration are challenges for developing high‐performance NiO‐based anodes. Herein, by accelerating the solidification process of eutectic precursors, bimodal porous Ni@NiO nanowire networks containing refined one‐dimensional nanowire skeleton, abundant porous structure and large number of surface oxygen defects are obtained. The well‐designed porous networks can effectively adapt to the volumetric variation of electrode during cycling. In addition, the density functional theory computation confirms that oxygen vacancies play an important role in providing superior Li capture ability, enhancing the electrical conductivity and surface reactivity. Benefiting from the above advantages, the Ni@NiO‐45 anode presents impressive cycling stability, delivering a reversible capacity of 697.9 mAh g−1 after 100 cycles at a current density of 100 mA g−1. The proposed structural regulating strategy in this study is anticipated to promote the exploitation of high‐performance conversion anodes and the application of dealloying technology in extensive fields.

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“…This is perhaps because there was no collective excitation of electron spins in nickel nanoparticles. In the Raman spectra, vibratory bands that indicate nanoparticles of metallic Ni 0 were not observed, as mentioned in the XRD analyzes [37].…”

Section: Materials Characterizationmentioning

confidence: 88%

2,5-Dimethylfuran Production by Catalytic Hydrogenation of 5-Hydroxymethylfurfural Using Ni Supported on Al2O3-TiO2-ZrO2 Prepared by Sol-Gel Method: The Effect of Hydrogen Donors

et al. 2022

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5-Hydroxymethylfurfural (5-HMF) has been described as one of the 12 key platform molecules derived from biomass by the US Department of Energy, and its hydrogenation reaction produces versatile liquid biofuels such as 2,5-dimethylfuran (2,5-DMF). Catalytic hydrogenation from 5-HMF to 2,5-DMF was thoroughly studied on the metal nickel catalysts supported on Al2O3-TiO2-ZrO2 (Ni/ATZ) mixed oxides using isopropanol and formic acid (FA) as hydrogen donors to find the best conditions of the reaction and hydrogen donor. The influence of metal content (wt%), Ni particle size (nm), Nickel Ni0, Ni0/NiO and NiO species, metal active sites and acid-based sites on the catalyst surface, and the effect of the hydrogen donor (isopropanol and formic acid) were systematically studied. The structural characteristics of the materials were studied using different physicochemical methods, including N2 physisorption, XRD, Raman, DRS UV-Vis, FT-IR, SEM, FT-IR Pyad, H2-TPD, CO2-TPD, H2-TPR, TEM and XPS. Second-generation 2,5-DMF biofuel and 5-HMF conversion by-products were analyzed and elucidated using 1H NMR. It was found that the Ni0NiO/ATZ3WI catalyst synthesized by the impregnation method (WI) generated a good synergistic effect between the species, showing the best catalytic hydrogenation of 5-HMF to 2,5-DMF using formic acid as a hydrogen donor for 24 h of reaction and temperature of 210 °C with 20 bar pressure of Argon (Ar).

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Controlled growth of Ni/NiO composite nanoparticles and its influence on exchange anisotropy and spin glass features

Cited by 21 publications

References 41 publications

Magnetic properties of nickel electrodeposited on porous GaN substrates with infiltrated and laminated connectivity

Magnetic properties of nickel electrodeposited on porous GaN substrates with infiltrated and laminated connectivity

Eutectic‐derived bimodal porous Ni@ NiO nanowire networks for high‐performance Li‐ion battery anodes

2,5-Dimethylfuran Production by Catalytic Hydrogenation of 5-Hydroxymethylfurfural Using Ni Supported on Al2O3-TiO2-ZrO2 Prepared by Sol-Gel Method: The Effect of Hydrogen Donors

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