Effects of anodization and electrodeposition conditions on the growth of copper and cobalt nanostructures in aluminum oxide films

Abstract

International audienceAnodic aluminum oxide (AAO) films were prepared by alternative current (ac) oxidation in sulfuric acid and phosphoric acid solution. The porous structure of the AAO templates was probed by ac electrodeposition of copper. AAO templates grown using an applied square waveform signal in cold sulfuric acid solution exhibit a greater pore density and a more homogeneous barrier layer. UV–vis–NIR reflectance spectra of the Cu/AAO assemblies exhibit a plasmon absorption peak centered at 580 nm, consistent with the formation of Cu nanostructures slightly larger than 10 nm in diameter. Spectroscopic data also indicate that there is little or no oxide layer surrounding the Cu nanostructures grown by ac electrodeposition. The effect of pH of the cobalt plating solution on the magnetic properties of the Co/AAO assemblies was also investigated. Co nanowire arrays electrodeposited at pH 5.5 in H2SO4-grown AAO templates exhibit a fair coercivity of 1325 Oe, a magnetization squarness of about 72%, and a significant effective anisotropy

Characterization of nanopores arrangement of anodic alumina layers synthesized on low-(AA1050) and high-purity aluminum by two-step anodizing in sulfuric acid with addition of ethylene glycol at low temperature

“…One of the most commonly used approach of manufacture nanomaterials such as nanodots [1,2], nanowires [3][4][5][6][7] and nanotubes [8,9] of metal, oxide or semiconductor [10,11] is template assisted method with the use of anodic aluminium oxide (AAO) as a template. In this aspect the arrangement of nanopores of the nanoporous aluminium oxide template is very important parameter, because it determines the arrangement of the fabricated nanomaterials [12].…”

Synthesis, Characterization, and Formation Mechanism of Crystalline Cu and Ni Metallic Nanowires under Ambient, Seedless, Surfactantless Conditions

“…Panels A and B of Figure 6 features UV–visible spectra of Cu and Ni NWs produced under ambient conditions. The absorption spectrum for Cu highlights a surface plasmon peak centered at ∼594 nm, which is somewhat red-shifted from what has been previously shown in the literature, but this observation may possibly be due to an increase in diameter and aspect ratio as well as to a higher degree of aggregation by comparison with conventional Cu nanoparticles previously studied. − The absence of a peak near 370 nm, normally ascribed to Cu 2 O, indicates that there is no observable sign of widespread sample oxidation, although we cannot rule out the presence of localized oxidation upon air exposure, evident from the XRD data. Figure B highlights the presence of UV–visible absorption spectra of Ni NWs with an absorbance peak of ∼387 nm, which is in good agreement with the literature. , …”

Antimicrobial Aluminum Surfaces for Curbing Healthcare-Associated Infections—A Short Review

“…Their results showed a 95% antimicrobial efficiency for E. coli, P. aeruginosa, Streptococcus faecalis, and S. aureus. On the other hand, for DC silver electrodeposition, it is necessary to separate the AAO/Al templates from the base aluminum metal by chemical etching, followed by the metallization of the former [27]; while DC silver electrodeposition on aluminum is feasible, in practice, it can be challenging due to the increased complexity of the overall electrodeposition process [28].…”