Abstract:

The nanoparticles of NiO precursor were prepared by a low temperature solid state reaction under ultrasonic airflow. The precursor was converted into NiO nanorods after annealing at 650~900 ℃ in a molten salt medium. The structure and morphology of NiO precursor and nanorods were investigated by XRD, SEM and TEM technologies. The results indicated that the prepared precursor was spheric particles with a diameter of about 25 nm, and grew gradually to NiO nanorods with a diameter of about 300 nm and a length of several micrometers along with rising calcinging temperatures. The key factor in the process for the grwoth of NiO nanorods is the molten salt medium.

Key words: ultrasonic airflow method, low temperature solid state reaction, NiO nanorods, molten salt medium