ZnO-CuO core-branch nanocatalysts for ultrasound-assisted azide-alkyne cycloaddition reactions.

ZnO-CuO core-branch hybrid nanoparticles, synthesized by copper oxide growth and controlled oxidation on ZnO nanospheres, exhibited remarkable enhancement of catalytic activity and stability for ultrasound-assisted [3+2] azide-alkyne cycloaddition reactions, due to their high surface area and active facets of the CuO branches.