Hydrothermal Synthesis of CrO2 Nanoparticle Arrays on Ti nano-pit Array Templates

Abstract

Chromium dioxide (CrO[Formula: see text] nanoparticle arrays were fabricated on Ti nano-pit array templates by hydrothermal synthesis using CrO3 aqueous solution as precursor. The Ti nano-pit array template was obtained by stripping TiO2 nanotube array formed on the Ti foil. CrO2 nanoparticles are arranged in honeycomb pattern in a large area and their surface density reaches [Formula: see text][Formula: see text]cm[Formula: see text]. The CrO2 nanoparticle arrays show typical magnetic behavior, and the easy axis is parallel to the plane of Ti nano-pit array template. The influence of the concentration of CrO3 aqueous solution on the CrO2 nanoparticle arrays is studied and the mechanism of the formation of the CrO2 nanoparticle arrays is briefly discussed.