Facile Synthesis and Growth Mechanism of Flowerlike Ni−Fe Alloy Nanostructures

Abstract

Flowerlike Ni−Fe alloy nanostructures composed of nanorods have been synthesized via a facile hydrothermal approach at relatively low temperature (100 °C) independent of surfactants or external magnetic field. The concentrations of NaOH and FeCl3 play a crucial role in determining the morphology of the Ni−Fe alloy via adjusting the reaction rate. The excessive amount of NaOH favors the formation of alloyed phase without segregation. Such flowerlike architectures follow a stepwise growth mechanism with initial formation of nanocores aggregated from nuclei and a subsequent site-specific anisotropic growth of nanorods along their easy magnetic axis under kinetic control. The Ni−Fe flowers showed enhancement of their ferromagnetic properties, which may be attributed to the anisotropic shape and the incorporation of Fe compared to pure Ni. Our work may shed light on the designed fabrication of complex 3D architectures of other alloyed materials.

Three-dimensional FeSe2 microflowers assembled by nanosheets: Synthesis, optical properties, and catalytic activity for the hydrogen evolution reaction

“…In addition, threedimensional flower-like micro/nanostructures have been reported to exhibit unique properties and have potential applications in the fields of transistors, superconductors, photodetectors, solar cells and lithium ion batteries. [10][11][12] New methods to achieve the facile synthesis of threedimensional FeSe 2 micro/nanostructures with improved performance are thus highly needed, and several attempts in this direction have been reported. Flower-like FeSe 2 particles has been reported by Luan et al, [13] whereas Son and coworkers developed an organometallic approach to synthesize the FeSe 2 nanostructures.…”

Sol–gel preparation and characterization of NiCo and Ni3Fe nanoalloys

“…Ni-Fe and Ni-Co alloys have been focused among researchers because of their useful magnetic properties, such as high saturation magnetization, high Curie temperature, and low coercive force [3][4][5]. These nanoalloys have been prepared by thermodecomposition of organometallic precursors [3,[6][7][8][9][10][11][12], co-reduction of metallic ions by hydrazine [13][14][15], magneto-sputtering [16], electrodeposition [17,18], and ball-milling [19][20][21]. For instance, thermo-decomposition of organometallic precursors, such as Fe(acac) 3 [3], Co(acac) 2 [3] (acac denotes acetylacetone), Fe(CO) 5 [6][7][8], Co 2 (CO) 8 [7], Ni(CO) 4 [9], Fe[{N(SiMe 3 ) 2 } 2 ] (Me means methyl) [10], Ni[(COD) 2 ](COD represents 1,5-cyclooctadiene) [10], N(C 4 H 9 ) 4 ) 3 [Fe(CN) 6 ] [11], and Co( 3 -C 8 H 13 )( 4 -C 8 H 12 ) [12] have been used to fabricate these nanoalloys with grain sizes less than 20 nm or even less than 10 nm.…”

“…For instance, thermo-decomposition of organometallic precursors, such as Fe(acac) 3 [3], Co(acac) 2 [3] (acac denotes acetylacetone), Fe(CO) 5 [6][7][8], Co 2 (CO) 8 [7], Ni(CO) 4 [9], Fe[{N(SiMe 3 ) 2 } 2 ] (Me means methyl) [10], Ni[(COD) 2 ](COD represents 1,5-cyclooctadiene) [10], N(C 4 H 9 ) 4 ) 3 [Fe(CN) 6 ] [11], and Co( 3 -C 8 H 13 )( 4 -C 8 H 12 ) [12] have been used to fabricate these nanoalloys with grain sizes less than 20 nm or even less than 10 nm. However, it is worth noting that these methods [3][4][5][6][7][8][9][10][11][12][13][14][15] have some shortcomings, for example, the organometallic precursors are relatively expensive and hydrazine and carbonyl complexes (Fe(CO) 5 , Co 2 (CO) 8 , Ni(CO) 4 ) are highly toxic. Nontoxic agents have also been used to synthesis these nanoalloys [16][17][18][19] while the grain sizes of alloys prepared by these methods are larger than 20 nm.…”

The Effect of pH on Electroless Ni-Fe-P Alloy Plating on Poplar Veneer

“…NiFe alloys exhibit excellent electrical conductivity and magnetic performance. High magnetic permeability and low coercive force make NiFe alloys suitable for magnetic shielding materials, alloy cores, and transformer preparation (Duhamel et al 2005;Zhou et al 2005;Liu et al 2010). In addition, their processability and corrosion resistance are also excellent because of the relatively high Ni content.…”