Influence of Citric and Ascorbic Acids on Electrodeposited Au/FeAu Multilayer Nanowires

Abstract

AuFe electrodeposits onto a rotating disk electrode were examined to assess the composition and current efficiency behavior when citric acid, ascorbic acid, or a combination of both is present in the electrolyte. Nanowires were subsequently fabricated with pulsed current deposition to create compositionally, multilayered Au/FeAu nanowires. The FeAu layer of the nanowires was porous in a citrate electrolyte, but the porosity decreased with the addition of ascorbic acid in the electrolyte. Comparatively higher side reaction partial current densities ͑i sr ͒ in the citric acid electrolyte generated local alkaline conditions, inducing the chemical precipitation of Fe ions in the form of iron oxide nanoparticles inside the recess, which manifested as the regions of high porosity. Nonporous layers observed in the ascorbic acid bath, in combination with decreased i sr and increased current efficiency of the deposits, suggested that a similar mechanism of Fe precipitation inside the nanorecess is less likely.

Synthesis and Magnetic Anisotropy Analysis of Co/Au Multilayered Nanowires

“…Multilayered magnetic nanowires consisting of alternating magnetic and nonmagnetic layers are attracting increasing attention because they have unique magnetic, optical and catalytic properties and could be potentially used for biomolecular separation, microwave devices, high-density magnetic data storage and so on [5]- [8]. Various magnetic nanowire arrays, such as Co/Au [3], Co/Pt [9], CoPt/Pt [10], CoNi/Cu [11], Co/Ag [12], Ni/Cu [13], Fe/Au [14], [15] and Ni/Au [5], [16], have been extensively studied. Au is a noble metal with good bio-compatibility, excellent optical and catalytic properties [17], [18], and Co metal could have distinctly different magnetic properties because its crystalline anisotropy can be tuned due to the hexagonal closed-packed (HCP) structure [19].…”

Cu/Co-W nanolayers electrodeposited from single bath and investigations of their nanohardness

“…The electrodeposition of multilayers can be per formed from a single bath under pulse current or pulse potential mode and the periodicity of the current or potential pulses triggers the alternated growth of the noble (active) metal layer at low (high) values of cur rent or potential [10]. The electrodeposition of a num ber of multilayered coatings was reported, namely, of Cu/Ni, NiCo/Cu, Cu/Co, Cu/NiFe, Au/Co, Au/FeAu, and Cu/CoB/CoW(B)P [11][12][13][14][15][16][17]. Multi layered materials, tailored with a repetitive sequence of magnetic segments (e.g.…”

Magnetic Nanowires for Nanobarcoding and Beyond

“…Making MNWs as alloys of one magnetic (such as cobalt or iron) and one non-magnetic component allows the tailoring of the saturation magnetization from zero to the saturation magnetization of the magnetic component [ 50 ]. The common magnetic and non-magnetic components that can be easily co-electrodeposited are (1) iron with gold [ 31 , 51 ] or copper [ 52 ], (2) nickel with gold [ 53 ] or copper [ 54 , 55 ], or (3) cobalt with gold or copper [ 56 ].…”