无模板剂液相合成Ni(OH)2花状微球

采用一种简单的无模板剂液相合成方法制备了Ni(OH)2花状微球. 该Ni(OH)2花状微球由几十个相互连接的纳米片组成, 为α-Ni(OH)2和β-Ni(OH)2的混合晶型. 当溶液的其它条件固定时, Ni(OH)2花状微球的微观形貌随Ni(Ⅱ)浓度的变化而显著变化. 当溶液中Ni(Ⅱ)浓度为0.03 mol/L时, 花状微球粒径分布较均匀, 平均粒径约为2 μm, 微球由花瓣长度约为400 nm、厚度约为60 nm的纳米片花瓣组成. 通过观察反应过程中Ni(OH)2花状微球的微观形貌的变化, 提出了Ni(OH)2花状微球的纳米团聚-表面生长-表面溶解的形成机制.

Synthesis of Nickel Hydroxide Flower-like Microspheres by Template-free Liquid Process

Flower-like Ni(OH)2 microspheres were successfully synthesized with a facile template-free liquid process with hydrofluoric acid solution as the nickel ion ligand to form nickel-fluoro complex, NH3 aqueous solution as the OH- supplier and supplemental nickel ion ligand. The flower-like Ni(OH)2 microspheres were composed of dozens of nanoflakes with α-Ni(OH)2 and β-Ni(OH)2 mixed crystallinity. Morphologies of the Ni(OH)2 microspheres are influenced greatly by Ni(Ⅱ) concentrations while other solution conditions are fixed. When Ni(Ⅱ) concentration is 0.03 mol/L, the uniform flower-like Ni(OH)2 microspheres with average diameters of about 2 μm were obtained and composed of nanoflakes with length of about 400 nm and thickness of about 60 nm. The formation mechanism from aggregation growth and surface growth to surface dissolution was proposed, which was in good agreement with observation on the Ni(OH)2 samples during the reaction process.