Electroless Deposition of Ferromagnetic Cobalt Nanoparticles in Propylene Glycol
Electroless Deposition of Ferromagnetic Cobalt Nanoparticles in Propylene Glycol
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DOI：
10.1149/1.3169776
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发表时间：
2009-09
影响因子：
3.9
通讯作者：
M. Balela;Shunsuke Yagi;Z. Lockman;A. Aziz;A. Amorsolo;E. Matsubara
中科院分区：
文献类型：
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作者：
M. Balela;Shunsuke Yagi;Z. Lockman;A. Aziz;A. Amorsolo;E. Matsubara
在沸腾的丙二醇中，采用化学沉积法制备了直径约为40~400 nm的铁磁性钴纳米粒子。通过改变原料浓度和添加成核剂，在一定程度上减小了Co的颗粒尺寸。为了解多元醇体系中钴纳米粒子的形成过程，通过现场混合电位测量研究了丙二醇的电化学行为。混合电势随温度的升高和氢氧化钠的存在而降低，表明丙二醇的分解速度较快。当添加成核剂时，它也会突然转变为更负的值。这表明，成核剂既能催化丙二醇氧化反应，又能催化Co(II)物种的还原反应，并有助于Co纳米颗粒作为异相成核点的形成。
Ferromagnetic Co nanoparticles with diameters of about 40-400 nm are synthesized by electroless deposition in boiling propylene glycol. The Co particle size is decreased to a certain degree by varying the concentration of starting materials and by adding nucleating agents. The electrochemical behavior of propylene glycol is investigated by in situ measurements of mixed potential to understand the formation of Co nanoparticles in polyol systems. The mixed potential decreases with an increase in temperature and in the presence of NaOH, which suggests the faster decomposition of propylene glycol. It also shifts abruptly to a more negative value when nucleating agents are added. This indicates that nucleating agents catalyze both the oxidation reaction of propylene glycol and the reduction reaction of Co(II) species, as well as aid in the formation of Co nanoparticles as heterogeneous nucleation sites.