Effects of annealing temperature on the properties of ZnO/SnO2 core/shell nanorod arrays

Oxygen induced strained ZnO nanoparticles: an investigation of Raman scattering and visible photoluminescence

“…This indicates that the nanoparticles can be melted at about 900 C, which is much lower than the melting point of bulk ZnO. Similar results have been reported in a ZnO nanorod system, 18,19 in which ZnO nanorods melted and changed into particles at 950 C and 900 C. Moreover, theoretical investigation has also demonstrated that the melting temperature will decrease with the reduction of the sizes of nanostructures. 20 In order to further understand the effect of annealing on the properties of ZnO nanoparticles, we characterize the oxygen concentration in ZnO nanoparticles aer annealing treatment, nding the evolution in the ratio of oxygen and zinc with an increase in both annealing temperature and particle size.…”

High-temperature solid-state reaction induced structure modifications and associated photoactivity and gas-sensing performance of binary oxide one-dimensional composite system

“…Moreover, the Bragg reections of the SnO 2 phase were absent in the XRD pattern, revealing that the SnO 2 was fully transformed into the ZTO phase during the hightemperature solid-state reaction with the ZnO core. A successful formation of ternary Zn-Ti-O compound from the solidstate reaction of the constituent binary compounds in a onedimensional structure has been reported in ZnO-TiO 2 system with a temperature higher than 800 C. 18 Moreover, it has been shown that the solid-state reaction between ZnO and SnO 2 generate a phase formation of the ternary ZTO when the annealing temperature is higher than 900 C. 21 The XRD results herein demonstrated that the annealing temperature of 900 C in this study is enough to induce the solid-state reaction between the ZnO core and SnO 2 shell of the composite nanorods and the formation of the ZTO shell layer on the residual ZnO core. the {110} and {200} lattice plane of the tetragonal SnO 2 structure, respectively.…”