Preparation of porcupine-like Bi 2O 3 needle bundles by anodic oxidation of bismuth

摘要

AbstractA new Bi2O3structure resembling bundles of needles was prepared by anodic oxidation of a bismuth substrate in H2SO4electrolyte followed by annealing in air. Needle growth occurred on the timescale of minutes. The resulting porcupine-like needle bundles were characterized using SEM and XRD before and after annealing. The as-grown needles consisted of bismuth aqua sulfate hydroxide; however, upon annealing at 250°C in air, tetragonal β-Bi2O3was produced without any morphological change.Graphical abstractDisplay OmittedHighlights?Breakdown anodization of Bi substrates in H2SO4electrolyte was carried out.?