Gold-catalytic green synthesis of Cu₂O/Au/CuO hierarchical nanostructure and application for CO gas sensor

Hierarchical Cu₂O/Au/CuO nanostructures have been achieved by water-based green fabrication at a low temperature. Precluding the requirement of the template removal, the generation of hierarchical architecture relied on the catalytic activity of gold nanoparticles attached on the Cu₂O nanocubes. Notably, we creatively developed the dual-roles catalytic ability of gold, which not only remarkably increased the specific surface area of this architecture, but also provided the enhanced performance for gas sensing.