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柠檬酸盐凝胶法制备纳米氧化镍的研究

景茂祥1; 沈湘黔1,2; 沈裕军1

  

  1. 1. 长沙矿冶研究院研发中心 长沙 410012; 2. 江苏大学材料科学与工程学院, 镇江 212013
  • 收稿日期:2003-03-24 修回日期:2003-05-08 出版日期:2004-03-20 网络出版日期:2004-03-20

Preparation of Nanometer Nickel Oxide by The Citrate-Gel Process

JING Mao-Xiang1; SHEN Xiang-Qian1,2; SEHN Yu-Jun1

  

  1. R&D Center; Changsha Research Institute of Mining and Metallurgy; Changsha 410012; China; School of Material Science and Engineering; JiangSu University; Zhenjiang 212013; China
  • Received:2003-03-24 Revised:2003-05-08 Published:2004-03-20 Online:2004-03-20

摘要: 优化了柠檬酸盐凝胶法制备纳米氧化镍粉体的工艺条件.采用傅立叶红外光谱(FTIR)、热分析(TG/DTA)、X射线衍射(XRD)、扫描电镜(SEM)和BET法对柠檬酸镍络合物的形成,凝胶热分解过程,产物的形貌、粒径和比表面积大小以及同材料配比、热处理温度、热处理时间之间的关系进行了研究,确定了制备纳米氧化镍的最佳工艺条件(柠檬酸与镍离子摩尔比1.2:1.0,400℃热处理1h),并在此条件下成功制备了粒径达30nm,比表面积达181.29m2/g的NiO粉体.通过热力学计算,解释了在凝胶热分解过程中金属镍相出现的可能原因.

关键词: 柠檬酸盐凝胶法, 纳米氧化镍, 热处理

Abstract: The optimum process for preparing nanometer nickel oxide by the citrate-gel method was studied.
The gel and products derived from the consequent thermal decomposition were characterized by FTIR, XRD, SEM and BET techniques.The thermal decomposition
of the gel was analysed by TG/DTA. The effects of heat-treatment temperature, time on particle shape, size and specific surface area were studied and the
preparation process was optimized. The NiO prepared in the optimum conditions (CA: Ni2+ mole ratio 1.2:1.0, 400℃ heat-treatment for 1h) has
particle size <50nm, specific surface area >180m2/g. The metallic nickel formation during the gel heat treatment is due to the in situ reduction
of nickel oxide by carbon or carbon monoxide produced from the gel precursor.

Key words: citrate-gel process, nanometer nickel oxide, thermal treatment

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