Superparamagnetic nickel nanoparticles obtained by an organometallic approach

Ramírez-Meneses, E.; Betancourt, I.; Morales, F.; Montiel‐Palma, Virginia; Villanueva-Alvarado, C. C.; Hernández-Rojas, M. E.

doi:10.1007/s11051-010-0039-7

Cited by 33 publications

(17 citation statements)

References 56 publications

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“…[57] The existence of superparamagnetic nickel nanoparticles has been measuredb y SQUID before. [58,59] Ramírez-Meneses et al [59] calculated that the superparamagnetic limit of nickel is around 44 nm. Although, accordingt oadifferent calculation by Respaud et al, [60] when the thermal activation is taken into consideration, the superparamagnetic limit of nickel is 9.57 nm.…”

Section: Characterization Of Nanoparticlesmentioning

confidence: 99%

Liquid Nickel Salts: Synthesis, Crystal Structure Determination, and Electrochemical Synthesis of Nickel Nanoparticles

Sniekers

Verguts

Brooks

et al. 2015

Chemistry A European J

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New nickel-containing ionic liquids were synthesized, characterized and their electrochemistry was investigated. In addition, a mechanism for the electrochemical synthesis of nanoparticles from these compounds is proposed. In these so-called liquid metal salts, the nickel(II) cation is octahedrally coordinated by six N-alkylimidazole ligands. The different counter anions that were used are bis(trifluoromethanesulfonyl)imide (Tf2 N(-) ), trifluoromethanesulfonate (OTf(-) ) and methanesulfonate (OMs(-) ). Several different N-alkylimidazoles were considered, with the alkyl sidechain ranging in length from methyl to dodecyl. The newly synthesized liquid metal salts were characterized by CHN analysis, FTIR, DSC, TGA and viscosity measurements. An odd-even effect was observed for the melting temperatures and viscosities of the ionic liquids, with the complexes with an even number of carbon atoms in the alkyl chain of the imidazole having a higher melting temperature and a lower viscosity than the complexes with an odd number of carbons. The crystal structures of several of the nickel(II) complexes that are not liquid at room temperature were determined. The electrochemistry of the compounds with the lowest viscosities was investigated. The nickel(II) cation could be reduced but surprisingly no nickel deposits were obtained on the electrode. Instead, nickel nanoparticles were formed at 100 % selectivity, as confirmed by TEM. The magnetic properties of these nanoparticles were investigated by SQUID measurements.

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Section: Characterization Of Nanoparticlesmentioning

confidence: 99%

Liquid Nickel Salts: Synthesis, Crystal Structure Determination, and Electrochemical Synthesis of Nickel Nanoparticles

Sniekers

Verguts

Brooks

et al. 2015

Chemistry A European J

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“…1 The control of physical, chemical and 3 biological properties in the nanometric scale is based on the ability to manipulate the size and shape of NPs. [2][3][4][5][6][7] In recent years, Ni NPs have attracted scientific interest because of their extensive prospects in catalysts, 8,9 conducting pastes, 10 information storage, 8 large-scale batteries, 11 magnetic behavior, [12][13][14][15] enhanced optical properties, 16 and biomedicine. 17 Several works on Ni NPs generation by laser ablation using different pulsed laser regimes and different media have appeared in the literature in the last years.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ni Nanoparticles by Femtosecond Laser Ablation in Liquids: Structure and Sizing

et al. 2015

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Synthesis of nickel (Ni) nanoparticles (NPs) suspensions was performed using a 120 femtosecond (fs) pulse laser to ablate a Ni solid target in n-heptane and water.Analysis of structure, configuration and sizing was carried out using different independent techniques such as Optical Extinction Spectroscopy (OES), Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM) and Electron Diffraction (ED), which yield interrelated information.AFM microscopy allows determining the spherical shape and size distribution of the NPs in the obtained colloids while TEM provides knowledge about shape, structure and size distribution. ED allows identification of the different metal and metal oxide composition as well as their crystallographic phase. On the other hand, OES gives information related to size distribution, structure, configuration and composition.Interpretation of these spectra is based on Mie theory which, in turn, depends on Ni dielectric function. For NPs radii smaller than 3 nm, size-dependent free and bound electron contributions to the dielectric function must be considered. To account for the full size span, complete Mie expansion was used for optical extinction cross-section calculations. A theoretical analysis of the dependence of plasmon resonance of bare core and core-shell Ni NPs with core size and shell thickness provide insight about their spectroscopic features.For n-heptane, species like bare core Ni and hollow Ni NPs are found in the colloid, being the latter reported for the first time in this work. Instead, for water, the colloid contains hollow nickel NPs and nickel oxide in different core-shell configurations: Ni-NiO and NiO-Ni, being the latter also reported for the first time in this paper. In both cases, size distribution agrees with that derived from TEM and AFM analysis. The formation of the oxide species is discussed in terms of oxidation-reduction processes during ablation. Possible mechanisms for the formation of hollow species are proposed.

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“…Nevertheless, Ni(COD) 2 has been used as a starting material for the production of molecular magnetic materials [5]. Since Ni(COD) 2 decomposes in air, or on exposure to heat (T Dec ≈ 60 • C) [6], to produce bulk Ni readily, it has become a favourable starting material for making Ni nanoparticles [7,8,9,10], typically by the thermal decomposition of Ni(COD) 2 in colloidal systems [11,12,13,14]. Here we report that Ni(COD) 2 is also a suitable material for the synthesis and study of magnetic Ni clusters following partial thermal decomposition.…”

Section: Introductionmentioning

confidence: 99%

A Magnetic Study of Low Moment Nickel Clusters Formed from the Solid-State Decomposition Reaction of Nickel bis-1,5-Cyclooctadiene

2013

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(2013) 'A magnetic study of low moment nickel clusters formed from the solid-state decomposition reaction of nickel bis-1,5-cyclooctadiene.', Journal of custer science., 24 (4).pp. 1057-1066. Further information on publisher's website:http://dx.doi.org/10.1007/s10876-013-0597-9Publisher's copyright statement:The nal publication is available at Springer via http://dx.doi.org/10.1007/s10876-013-0597-9.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. (COD)2) is reported. The material is shown to be a mixed phase magnetic system where the Ni(COD)2 behaves as a diamagnet containing a paramagnetic component at low temperatures which we believe consists of elemental Ni clusters arising from the decomposition of the material. The magnetic response of the Ni clusters can be described by the combination of two Langevin functions, which indicate cluster magnetic moments of 1.8 µB and 15 µB suggesting Nin clusters with n = 2 − 3 and n = 14 − 19. However, we demonstrate that these clusters appear to show a spin transition to an S = 0 state at low temperatures, which may be a consequence of interactions between the clusters and the surrounding organic medium. Nevertheless, our results suggest that Ni(COD)2 is a novel material for the study of Ni clusters embedded in a diamagnetic background material.

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Superparamagnetic nickel nanoparticles obtained by an organometallic approach

Cited by 33 publications

References 56 publications

Liquid Nickel Salts: Synthesis, Crystal Structure Determination, and Electrochemical Synthesis of Nickel Nanoparticles

Liquid Nickel Salts: Synthesis, Crystal Structure Determination, and Electrochemical Synthesis of Nickel Nanoparticles

Synthesis of Ni Nanoparticles by Femtosecond Laser Ablation in Liquids: Structure and Sizing

A Magnetic Study of Low Moment Nickel Clusters Formed from the Solid-State Decomposition Reaction of Nickel bis-1,5-Cyclooctadiene

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