Abstract
The paper scrutinizes the peculiarities of porous alumina growth during electrochemical anodic oxidation in the orthophosphoric acid solution at constant potential of 100 Volt. On the basis of atomic-force microscopy data the paper presents consecutive stages of ordering pores in the oxide with the formation of hexagonal dense package after two-stage anodic treatment.
Highlights
Oxide films on the surface of metals and semiconductors are widely used as electric isolation, corrosion-inhibiting covering, and intermediate buffer layers during hermetic metal brazing with different glasses, etc
The presence of some concentration of noncorroded imperfections leads to the uneven distribution of electric field force lines, and to the uneven growth of the oxide film in the shape of the islands (Figure 1a)
Thereby, this paper scrutinized the peculiarities of electrochemical formation of porous alumina
Summary
Oxide films on the surface of metals and semiconductors are widely used as electric isolation, corrosion-inhibiting covering, and intermediate buffer layers during hermetic metal brazing with different glasses, etc. Nowadays much attention is given to nanoporous oxides [1, 2], which are anodestructured in oxygen-containing electrolytes Such structures often have nonstandard physical, optical and electric properties, including high photosensitivity [3] and catalytic selectivity, which gives an opportunity of practical use of nanoporous structures as extremely sensitive sensors of gas environment components [4]. The priority of such structures is noticeable in photocatalysis [5], in production technique of lithium-ion batteries of extended capacity [6], in solar cells of new generation [7]. Within the scope of the research this paper will present consecutive stages of the growth of porous anodic alumina, having an ordered honeycomb structure
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