Synthesis and magnetic properties of nickel and cobalt nanoparticles obtained in DMF solution

Zhang, Zhongjie; Chen, Xiangying; Zhang, Xingfa; Shi, Chengwu

doi:10.1016/j.ssc.2006.06.040

Cited by 46 publications

(30 citation statements)

References 14 publications

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“…Recently, Zhang et al [32] have shown that DMF can also reduce Ni 2þ and Co 2þ ions, but only under extreme conditions (in an autoclave at 160 8C for 12 h), to produce nickel and cobalt nanoparticles, respectively, through the oxidation of DMF to carboxylic acid. Interestingly, the obtained nanoparticles presented ferromagnetic behavior.…”

Section: Capping Agents Other Than Pvpmentioning

confidence: 99%

N,N‐Dimethylformamide as a Reaction Medium for Metal Nanoparticle Synthesis

Pastoriza‐Santos

Liz‐Marzán

2009

Adv Funct Materials

379

254

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The versatility of wet chemical methods has rendered them extremely popular for the preparation of metal nanoparticles with tailored size and shape. This Feature Article reviews the use of N,N‐dimethylformamide (DMF) for the reduction of metal salts, mainly Au and Ag, while also acting as a solvent. Apart from describing the ability of DMF to reduce metal salts, the effect of different parameters, such as the concentration of capping agent and metal precursors, the presence of preformed seeds acting as catalysts or their crystalline structure, on particle morphology are analyzed. Published reports on the use of different capping agents are summarized, with particular emphasis on the role of poly(vinylpyrrolidone) to determine the morphology of the particles. Finally, a brief overview is provided on the modulation of the optical response in DMF‐based metal nanoparticle colloids with tunable size and shape.

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Section: Capping Agents Other Than Pvpmentioning

confidence: 99%

N,N‐Dimethylformamide as a Reaction Medium for Metal Nanoparticle Synthesis

Pastoriza‐Santos

Liz‐Marzán

2009

Adv Funct Materials

379

254

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“…The related values of coercive field H c and of squareness S , defined as the ratio of the remanent magnetization M r to the saturation magnetization M s , are reported in Table 1. The coarser particles exhibit a weaker H c (≈50 Oe) than the smaller ones (≈100 Oe) and a higher M s (165 vs. 145 emu/g) typical of bulk characteristics 26. Surface oxidation or, as previously observed, residual solvent molecules adsorbed on the surface 27, 28 could explain the observed reduction of M s for the small particles relative to the bulk value.…”

Section: Resultsmentioning

confidence: 56%

Magnetic properties of ultrafine‐grained cobalt samples obtained from consolidated nanopowders

Fellah

Chérif

Bouziane

et al. 2011

Physica Status Solidi (a)

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Co powders having nominal average particle size of 50 and 240 nm were synthesized using a polyol method and then consolidated by hot isostatic pressing (HIP) or the emerging spark plasma sintering (SPS) compaction processes. Bulk polycrystalline aggregates were obtained, having average grain sizes of about 200 and 300 nm, respectively. It is found that both nanoparticles and consolidated samples exhibit a soft ferromagnetic behavior. The magnetization reversal likely occurs by nucleation/propagation process. However, a curling process can be involved in the magnetization reversal for the smaller particles. The dynamic measurements provide for the consolidated samples magnetic parameters corresponding to bulk cobalt with vanishing anisotropy. The contribution of the intergranular region is found to be negligible. We can infer that the used consolidation routes insure a good magnetic interfacial contact between the particles.

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“…The hexagonal phase can be obtained directly by high temperature chemical synthesis in the temperature range of 200-270°C using NaBH 4 as a reducing agent in tetraglyme. Although higher coercivity values have been reported [8][9][10][11][12][13][14][15], none have been able to obtain moderate coercivity and saturation magnetization values close to that of bulk Co. We have shown that spherical Co particles can be synthesized with a high magnetization (143 emu/g) and with a moderate coercivity of around (500 Oe). After annealing a saturation magnetization of (160 emu/g) and coercivity of (540 Oe) is obtained.…”

Section: Resultsmentioning

confidence: 67%

“…Previous wet chemical methods such as thermal decomposition of metal precursors, sonochemical, solvothermal process, metal salt reduction, reverse micelles and polyol process [7][8][9][10][11][12][13][14] have been shown to produce low dimensional single crystal cobalt. In this study, we have investigated a new wet chemical method for producing crystalline Cobalt nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

New approach for direct chemical synthesis of hexagonal Co nanoparticles

Abel

Tzitzios

Hadjipanayis

2016

Journal of Magnetism and Magnetic Materials

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a b s t r a c tIn this paper, we explore the possibility of producing hexagonal Cobalt nanoparticles, with high saturation magnetization by direct chemical synthesis. The nanoparticles were synthesized by reduction of anhydrous cobalt (II) chloride by NaBH 4 in tetraglyme at temperatures in the range of 200-270°C under a nitrogen-hydrogen atmosphere. The reactions were done at high temperatures to allow for the formation of as-made hexagonal cobalt. The size of the particles was controlled by the addition of different surfactants. The best magnetic properties so far were obtained on spherical hexagonal Co nanoparticles with an average size of 45 nm, a saturation magnetization of 143 emu/g and coercivity of 500 Oe. the saturation magnetization and coercivity were further improved by annealing the Co nanoparticles leading to saturation magnetization of 160 emu/g and coercivity of 540 Oe.

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Synthesis and magnetic properties of nickel and cobalt nanoparticles obtained in DMF solution

Cited by 46 publications

References 14 publications

N,N‐Dimethylformamide as a Reaction Medium for Metal Nanoparticle Synthesis

N,N‐Dimethylformamide as a Reaction Medium for Metal Nanoparticle Synthesis

Magnetic properties of ultrafine‐grained cobalt samples obtained from consolidated nanopowders

New approach for direct chemical synthesis of hexagonal Co nanoparticles

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