Printable Hierarchical Nickel Nanowires for Soft Magnetic Applications

Abstract

Hierarchical nickel nanowires (h-NiNWs) were synthesized by a simple reduction method and their electrical, magnetic, and electromagnetic characteristics were investigated. These nanowires possess a high magnetic saturation ( M s ) of 51 emu/g and also a coercivity ( H c ) of 34.5 Oe, which makes them suitable for soft magnetic sensor applications. Hall transport is being reported for the first time for h-NiNWs, and electrical conductivity at room temperature was studied to assess their applicability as a Hall sensor wherein the Hall coefficient R H was found to be −1.39 × 10 –12 Ω cm/Oe. Electromagnetic characterization of synthesized h-NiNWs shows excellent microwave shielding effectiveness of above 24 dB for the Ku band (12.4–18 GHz) and a maximum value of 32 dB at 14 GHz for a sample with a thickness of about 1 mm. A room-temperature-curable screen-printable ink was formulated using the synthesized magnetic nanostructures and printed on different flexible substrates. Printed patterns show promising ferromagnetic properties, and they could be potential candidates for soft magnetic sensor applications.

Prudent electrochemical pretreatment to promote the OER by catalytically inert “Iron incorporated metallic Ni nanowires” synthesized via the “non-classical” growth mechanism

“…These larger spheroids then assembled along a particular direction into necklace-like chains due to the anisotropic magnetic forces. [17][18][19][20] The fact that the average diameter of the wires remained similar to that of the spheroids, while the length increased with increase in reaction time validates this point. As highlighted in Fig.…”

Template- and Magnetic Field-Free Chemical Reduction of Ni Nanochains for Ni–Al2O3 Cermet Films: Growth Control, Characterization, and Application

“…To clarify the formation mechanism of Ni NCs, according to the chemical reduction reaction expressed in eq 1 : 10 …”

“… 9 The morphology and structure of anisotropic NPs has a great deal of impact on their properties arising from their size and shape. 10 An NC configuration consists of individual NPs attached to one another and orienting themselves in a chain-like structure. With this unique nanostructure of Ni particles dispersed in the Al 2 O 3 layer, the overall solar absorption can be significantly enhanced due to multiple scatterings in which the light can be reflected back and forth within the coating, minimizing thermal emittance losses.…”

Wettability, Diffusion Behaviors, and Modeling of Ni Nanoparticles and Nanowires in Brazing Inconel 718

“…Ni NW Synthesis: The NW synthesis procedure was modified from the study by Remadevi et al [42] A 1 g of K-30 PVP (M.W. ¼ 40 000) was added to 200 mL of a 61 mM solution of nickel chloride hexahydrate in an ethylene glycol-water mixture (3:1 ratio by volume).…”

“…The reaction was allowed to continue for 20 min then was allowed to cool naturally. The resulting Ni NWs were first collected by a permanent magnet, then washed with ethanol via centrifugation three times at 8000 rpm for 5 min, [ 42 ] and dried in a freeze dryer. A 0.12 g of dry Ni NWs was loaded into a rectangular die press (12 mm × 12 mm) without any binder material and uniaxially pressed under 400 MPa of pressure.…”