Influence of PVP in magnetic properties of NiSn nanoparticles prepared by polyol method

Synthesis and Characterization of Pure Ni and Ni-Sn Intermetallic Nanoparticles

“…Furthermore, Ni-Sn NPs synthesized via the first route consisted partly of pure Ni which caused them to be ferromagnetic. Such a magnetic behavior of nanoparticles synthesized with an initial molar ratio Ni:Sn = 3:1 was also indicated by Bobadilla et al [ 3 ]. Therefore, such nanoparticles could be of interest for industrial applications as possible bimetallic ferromagnetic materials in nano-sized form.…”

“…In addition, XRD patterns of Ni-Sn nanoparticles showed two broad peaks with low intensity for compositions Ni:Sn = 3:2 and 1:1, similar to those for nanoparticles with initial a molar ratio Ni:Sn = 3:1 in Ref. [ 3 ]. In contrast, the XRD pattern for nanopowder with a molar ratio Ni:Sn = 3:1 showed one broad peak at 2 θ = 43.05 0 which is typical for amorphous materials.…”

“…The abovementioned heterogeneous nucleation leads to the production of nanoparticles with local concentration gradients compared to the initial composition, a fact mentioned also in Refs. [ 3 , 7 , 8 , 14 ]. For instance, based on the EDX analysis it was estimated that the concentration of Ni in the Ni-Sn NPs produced via the second route with initial molar ratios Ni:Sn = 3:1, 3:2, and 3:4 changes in the range 67–82 at.%, 55–62 at.%, and 56–68 at% Ni, correspondingly.…”

“…A similar variation of the amount of PVP in relation to the other reagents was used by Roshanghias et al [ 2 ], investigating the impact of the added amount of PVP on the size and morphology of the synthesized Sn-based (Sn-Ag-Cu) nanoparticles. A similar study was performed by Bobadilla et al [ 3 ] who tried to control the size and morphology of as-synthesized Ni-Sn nanoparticles by the amount of PVP added. Zhang et al [ 4 ] synthesized Ag nanoparticles by reducing silver nitrate with hydrazine hydrate, controlling the particle size by the PVP/AgNO 3 molar ratio (up to 2.25).…”

“…For instance, Bobadilla et al [ 3 ] synthesized Ni-Sn nanoparticles with an initial molar ratio Ni:Sn = 3:1 while the diffraction lines in the XRD pattern of the obtained nanopowder corresponded to the intermetallic compound (IMC) Ni 3 Sn 2 . The solution was firstly heated to 323 K, and after addition of NaBH 4 refluxed at 473 K for 2.5 h. The produced nanopowder was washed and dried at 373 K for 12 h. The authors concluded that several XRD peaks could be referred to Ni 3 Sn; however, taking into account the very poor signal-to-noise ratio, this appears to be an overly optimistic assumption.…”