Synthesis and magnetic properties of face-centered-cubic and hexagonal-close-packed Ni nanoparticles through polyol process

Chinnasamy, C. N.; Jeyadevan, B.; Shinoda, Kōzō; Tohji, Kazuyuki; Narayanasamy, A.; Sato, Kazuhisa; Hisano, S.

doi:10.1063/1.1851951

Cited by 79 publications

(74 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Recently, the synthesis and characterization of nanocrystalline hcp Ni have been attracting widespread attention because of their unique magnetic properties and improved performances by their particle sizes, crystal structures and inter-particle interaction [14][15][16]. Nanosized Ni can be fabricated by a variety of physical and chemical methods including pyrolysis, sputtering, reversed micelles, aqueous and nonaqueous chemical reduction, sonochemical deposition, and polyol [17][18][19][20]. Mi et al [14], Chinnasamy et al [17], and Jeon et al [18] successfully synthesized pure fcc Ni nanoparticles, hcp Ni nanoparticles and a mixture of fcc and hcp Ni nanoparticles in different organic solvents using a chemical reduction method under free-standing conditions.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of hexagonal close-packed Ni nanoparticles

et al. 2008

View full text Add to dashboard Cite

Hexagonal close-packed Ni nanoparticles were synthesized using a heat-treating technique with the precursors prepared by the sol-gel method. The synthesis condition, structure, and morphology of the samples were characterized and analysed by thermogravimetric analysis (TG), differential thermal analysis (DTA), X-ray diffraction (XRD) and transmission electron microscopy (TEM). Results indicate that the hexagonal close packed Ni nanoparticles were synthesized at a heat-treating temperature of 300uC. The cell constants are calculated at a 5 0.2652 nm and c 5 0.4334 nm. The average grain size of the hexagonal close-packed Ni particles evaluated by Scherrer equation is about 12 nm. The phase transformation from a hexagonal close-packed Ni to a face-centered cubic Ni structure occurred when the heat-treating temperature was increased.

show abstract

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of hexagonal close-packed Ni nanoparticles

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Previously, it has been reported that the hexagonal phase synthesized in the polyol solution changes to the fcc phase by annealing. 7) Hence a significant change of magnetization due to the crystallographic transition is expected by annealing for the specimen synthesized with PVP. To appear the crystallographic transition temperature, Fig.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the hexagonal phase synthesized in the polyol solution has been characterized as non-magnetic because the saturation magnetization becomes lower as the volume fraction of the hexagonal phase increases with decreasing Ni salt concentration. 7) Since the saturation magnetization for the fcc phase is much larger than that for the hexagonal phase, the magnetization measurement is meaningful to examine the influence of PVP on the volume fraction of the fcc phase in more detail. for the specimen synthesized with 15 g/L PVP.…”

Section: Resultsmentioning

confidence: 99%

“…It has been reported that the volume fraction of the hexagonal and fcc phases in precipitated particles can be controlled by adjusting the reaction conditions in Ni saltpolyol system. 7) For example, the volume fraction of the hexagonal phase in precipitated particles increases with decreasing Ni salt concentration. 7) Moreover, the volume fraction of the hexagonal phase in precipitated particles obtained at a relatively high reaction temperature is more than that obtained at a relatively low reaction temperature.…”

Section: Introductionmentioning

confidence: 99%

“…7) For example, the volume fraction of the hexagonal phase in precipitated particles increases with decreasing Ni salt concentration. 7) Moreover, the volume fraction of the hexagonal phase in precipitated particles obtained at a relatively high reaction temperature is more than that obtained at a relatively low reaction temperature. It has been suggested that the volume fraction of the hexagonal and fcc phases is influenced by the precipitated particle size in the polyol solution 7,9) because the precipitated particle size becomes smaller with decreasing the Ni salt concentration and with increasing reaction temperature.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Ni Carbide Nanoparticles with Ni<sub>3</sub>C-Type Structure in Polyol Solution Containing Dispersant

et al. 2012

View full text Add to dashboard Cite

Nanoparticles of Ni carbide of about 50 nm in diameter were synthesized by the reduction of Ni salt in a polyol solution in the presence of polyvinylpyrrolidone (PVP). It was found that the aggregation of nanoparticles was suppressed when PVP was added to the polyol solution during synthesis. Diffraction peaks of the fcc and hexagonal structures were observed for the specimen synthesized without PVP. On the other hand, no peaks assigned to the fcc structure and no spontaneous magnetization were observed for the specimen synthesized with 50 g/L PVP, although pure bulk Ni are fcc structure and ferromagnetic at room temperature. Additionally, small peaks were observed in the X-ray diffraction pattern at 2ª = 26.2, 35.7 and 47.8°, originated not from the impurity phase but from the hexagonal phase. The specimen synthesized with 50 g/L PVP was fundamentally identified as Ni carbide with a Ni 3 C-type structure, as small peaks mentioned above were assigned to superlattice peaks. The structure parameters of the Ni carbide were refined by Rietveld analysis. It is concluded that the formation of the Ni carbide nanoparticles with Ni 3 C-type structure in the polyol solution is enhanced by the addition of PVP.

show abstract

Highly Stable Ni‐Based Flexible Transparent Conducting Panels Fabricated by Laser Digital Patterning

Nam

Shin

Yoon

et al. 2019

Adv Funct Materials

108

View full text Add to dashboard Cite

A novel simple laser digital patterning process to fabricate Ni-based flexible transparent conducting panels using solution-processed nonstoichiometric nickel oxide (NiO x ) thin films and their applications for flexible transparent devices are reported in this study. A largescale synthesis route to produce NiO x nanoparticle (NP) ink is also demonstrated. A low-power continuous-wave laser irradiation photothermochemically reduces and sinters selected areas of a NiO x NP thin film to produce Ni electrode patterns. Owing to the innovative NiO x NP ink and substantially lowered applied laser power density, Ni conductors can be fabricated, for the first time to the best of the authors' knowledge, even on a polyethylene terephthalate substrate, which is known to have one of the lowest glass-transition temperatures among polymers. The resultant Ni electrodes exhibit a high-temperature oxidation resistance up to approximately 400 °C, and high corrosion resistance in tap water and even in seawater. Moreover, a superior mechanical stability of the Ni conductors is confirmed by tape-pull, ultrasonic-bath, bending/twisting, and cyclic bending (up to 10 000 cycles) tests. Finally, flexible transparent touch screen panels and electrical heaters are fabricated with mesh-type Ni conductors to demonstrate possible applications.market. However, ITO suffers from several limitations such as brittleness and lack of flexibility of ITO layers, and costly deposition method requiring vacuum-based equipment, which hinders its application to the next-generation electronics, particularly to flexible or stretchable electronics. Therefore, the demand for alternative materials and deposition methods of TCEs is rapidly increasing. Among alternatives to conventional deposition or patterning methods for conducting/semiconducting electrodes, a laser digital patterning process on solution-processed nanoparticle (NP) thin films [2] has recently attracted significant attention since it enables to achieve a photolithography-free, low-cost, and ondemand electrode fabrication. The laser digital patterning process, in particular, can be applied to fabricate flexible electronic devices owing to lowered thermal stress exerting on thermally vulnerable polymer substrates (see expanded discussion in Section S1, Supporting Information). As materials for laser digital patterning in the early stage, NPs or nanocomposites composed of noble metals such as Ag or Au have been widely employed [3] because these nanomaterials are oxidation resistant, and thus can be easily formed to conducting electrodes simply by sintering. However, nowadays, there is an increasing demand to diversify the electrode materials not only owing to the high price of the noble metals but also particularly owing to the need for unique properties of relevant Flexible Conducting PanelsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.

show abstract

Synthesis and magnetic properties of face-centered-cubic and hexagonal-close-packed Ni nanoparticles through polyol process

Cited by 79 publications

References 7 publications

Preparation and characterization of hexagonal close-packed Ni nanoparticles

Preparation and characterization of hexagonal close-packed Ni nanoparticles

Synthesis of Ni Carbide Nanoparticles with Ni<sub>3</sub>C-Type Structure in Polyol Solution Containing Dispersant

Highly Stable Ni‐Based Flexible Transparent Conducting Panels Fabricated by Laser Digital Patterning

Contact Info

Product

Resources

About