“…However, more work is still needed to simplify the synthesis method and to improve the sensitivity. In this work, on the basis of previous works about the synthesis of ZnO nanoarrays [19][20][21][22], we deposited Ag nanoparticles onto the surfaces of ZnO nanoarrays through a photocatalytic process in which sunshine was applied as the light source. This method is very simple, economical, and low carbon.…”