Abstract
Self-assembled dual-working electrode electrolytic cells were designed to produce twin alumina-Co composite films with highly symmetrical microstructures using a deflected electric field-assisted alternating current electrodeposition method. The results show that the deposition current density, microstructure, and optical and magnetic properties of the twin composite films exhibit a high degree of symmetry. The distribution of magnetic Co particles in the alumina nanopores can be changed by adjusting the magnitude of the deflected electric field, resulting in a synchronous symmetrical change in the microstructure of the composite films, which enables the fine-tuning of the magneto-optical properties of the twin alumina-Co composite films at the microscopic scale. The current density distribution on the surface of the twin composite films along the direction of the deflected electric field was quantitatively analyzed by theoretical calculations and numerical simulations. The results show that the deposition current density gradually increases from 0.024 A/m2 in region C to 0.056 A/m2 in region A at 6 V deflection voltage. The saturation magnetization intensity gradually increases along the radial direction, which is 118, 130, and 150 kA/m, respectively
Highlights
As porous alumina films [1–3] have promising applications in biomedicine [4–6], optoelectronic devices [7,8], solar cells [9,10], decorative coating [11], catalysis [12,13], etc., and are of growing interest to many research groups
A series of twin alumina films were prepared under the below conditions: an oxidation voltage of 20 V, oxidation times of 7, 7.5, 9, 10, and min as templates, a deposition voltage of V, an electrode spacing of 10 cm, and an electrodeposition time of 5 s, without the application of a deflecting electric field
Twin alumina-Co composite films with highly symmetrical microstructure and physical properties were prepared by alternating current (AC) electrodeposition with dual working electrodes under a deflected electric field
Summary
As porous alumina films [1–3] have promising applications in biomedicine [4–6], optoelectronic devices [7,8], solar cells [9,10], decorative coating [11], catalysis [12,13], etc., and are of growing interest to many research groups. The preparation of alumina composite films with highly symmetrical microstructure and physical properties and gradient structural colors is a technical challenge due to the sensitivity of the film microstructure to experimental conditions during anodic oxidation and electrodeposition This kind of highly symmetrical alumina composite film has application value in the fields of miniaturized devices with symmetrical optical and magnetic properties, symmetrical decoration, color printing, and biological drug delivery, and is of great significance for perfecting the theoretical system of nano-assembly technology [26,27]. The regulation mechanism of the deflected electric field on the microstructure and magneto-optical properties of the composite films was analyzed, providing theoretical and experimental support for the fine-tuning the twin alumina-Co composite films This proposed method for designing magnetic alumina-Co composite films with highly symmetrical microstructure and physical properties is of high importance for diversifying the lattice structure of nanoporous alumina, enriching the functional applications of magnetic alumina composite films in biomedicine, optoelectronic devices, solar cells, and information storage, and improving the assembly technology of nanomaterials
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