超音速气流粉碎下NiO纳米棒的低温固相制备

采用超音速气流粉碎技术低温固相合成NiO纳米颗粒前驱体，并通过在650～900 ℃下， NaCl熔盐介质中对前驱体进行焙烧，制备得到NiO纳米棒。采用XRD、SEM、TEM测试技术对NiO前驱体、NiO纳米棒的结构和形貌进行了表征。结果表明，前驱体为直径约25 nm球形颗粒，随着焙烧温度升高，逐渐生成直径为300 nm，长度约十几微米的纳米棒。反应过程中熔盐介质是纳米颗粒前驱体生长的关键因素。

Preparation of NiO Nanorods by a Solid State Reaction at Low Temperatures under an Ultrasonic Airflow

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.