Preparation of fine nickel powders via reduction of nickel hydrazine complex precursors

• Published in: Transactions of Nonferrous Metals Society of China Vol. 19; no. 2; pp. 389 - 393
• Main Author: 黄国勇 徐盛明 徐刚 李林艳 张立峰
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2009; Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China%Department of Materials Science and Engineering, Missouri University of Science and Technology,223 McNutt Hall, Rolla, MO 65409, USA
• Subjects: chemical reduction; multilayer ceramic capacitors; nickel hydrazine complex; nickel powders; precursor; 反应摩尔比; 平均粒径; 氢氧化钠; 配体交换反应; precursor; multilayer ceramic capacitors; chemical reduction; nickel powders; nickel hydrazine complex
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(08)60283-6

Fine nickel（Ni） powders with controllable particle sizes were synthesized via the reduction of nickel hydrazine complex precursors of pure [Ni（N2H4）2]Cl2 and a mixture of [Ni（N2H4）2]Cl2 and [Ni（N2H4）3]Cl2 in aqueous solution. The mechanism of the formation of metallic Ni powders experiences the reduction of nickel hydroxide by hydrazine released from the ligand exchange reaction between nickel hydrazine complex and NaOH. In comparison with the method of preparing Ni powders from nickel salts, the method of making Ni powders via the reduction of nickel hydrazine complex precursors shows the advantages of using half dosage of hydrazine for complete reduction of nickel ions in.solution, and the obtained Ni particles show less agglomeration and better dispersibility. Moreover, the average particle size of nickel powders can be controlled from 180 to 260 nm by adjusting the reaction molar ratio and concentration.