Cobalt oxide nanorings prepared from hexagonal cobalt hydroxide nanosheets

Abstract

Hexagonal cobalt hydroxide nanosheets over a size range from 100 nm to 1 µm were synthesized using a simple hydrothermal route with cobalt naphthenate as the cobalt source. Additionally, hexagonal cobalt oxide nanorings over a size range from 100 nm to 1 µm consisting of cubic nanocrystals were obtained via a hydrothermal method using as-prepared cobalt hydroxide nanosheets as the precursors.