肼还原法制备镍纳米粒子及其机理_胡爱平.pdfVIP

第 38 卷第 6 期 中南大学学报( 自然科学版) Vol.38 No.6 2007 年 12 月 J. Cent. South Univ. (Science and Technology) Dec. 2007 肼还原法制备镍纳米粒子及其机理 胡爱平，唐元洪，彭 坤，罗小兰，朱文海 (湖南大学 材料科学与工程学院，湖南 长沙，410082) 摘 要：在乙二醇中用肼作还原剂还原Ni2+制备镍纳米粒子。用 X 射线衍射仪测定出产物的相结构，用扫描电 子显微镜观察产物的微观结构。根据反应现象和产物的相结构，研究温度、pH 值调节剂种类和 pH 值对镍纳米 粒子形成的影响，并推断其形成机理。研究结果表明，用肼作还原剂还原 Ni2+制备纳米 Ni 的最佳反应温度为 60 ℃，用NaOH 作 pH 值调节剂调 pH 值到 10~11 得到的镍纳米粒子为体心立方结构，平均粒径为 25 nm 。在 Ni 纳米粒子的形成过程中，NaOH 不仅起到调节 pH 值的作用，还起催化作用。 关键词：Ni 纳米粒子；肼；合成；形成机理 中图分类号：O781 ；TN304.3 文献标识码：A 文章编号：1672-7207(2007)06−1063−04 Synthesis and formation mechanism of nickel nanoparticles by hydrazine reduction HU Ai-ping, TANG Yuan-hong, PENG Kun, LUO Xiao-lan, ZHU Wen-hai (College of Materials Science and Engineering, Hunan University, Changsha 410082, China) Abstract: Nickel nanoparticles were obtained by hydrazine reduction of nickel chloride in ethylene glycol in an air atmosphere. The resultant particles were characterized by X-ray diffractometer and scanning electron microscope. The effects of temperature and alkalinity on the reaction were studied. The results show that the optimal conditions are as follows: temperature of 60 ℃, and NaOH as pH value adjusting reagents, pH value of 10−11. Under the optimal conditions, the resultant particles is pure crystalline nickel with an face centered cubic (fcc) structure and mean diameter of about 25 nm. According to the experiment phenomena in the process of reaction and the phase structure of resultant particles, it can be concluded that the reaction can be ca