We observed that, by heating in air, the ZnO nanorods could start to melt at a temperature
of∼ 750 C⁠, which is greatly reduced comparing with that of the bulk form. Prolonged
annealing at this temperature resulted in partial melting of individual nanorods and the
coalescence of the nanorods with their neighbors, leading to a great change in their optical
properties, ie, a new photoluminescence peak emerged at∼ 468 nm⁠. Further analysis
indicated that the new photoluminescence is closely related to the melting and the …