Synthesis of copper sulphide nanoparticles in carboxylic acids as solvent.
Synthesis of copper sulphide nanoparticles in carboxylic acids as solvent.
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DOI：
10.1166/jnn.2006.916
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发表时间：
2006-02
影响因子：
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通讯作者：
L. Armelao;Daniele Camozzo;S. Gross;E. Tondello
中科院分区：
文献类型：
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作者：
L. Armelao;Daniele Camozzo;S. Gross;E. Tondello
提出了一种基于硫化物快速成核法制备CuS纳米粒子的新方法。在相应的羧酸(醋酸、丙酸)溶剂中，硫代乙酸与水和羧酸铜(醋酸铜、丙酸铜)反应合成了纳米粒子。使用羧酸有几个优点：(I)有利于C-S键的水解，从而产生快速的CuS过饱和度和高成核率；(Ii)前体分子的迁移率受到限制，因此有利于粒子的生长；(Iii)介质的低介电常数通过降低临界凝聚浓度来稳定纳米颗粒的分散。用紫外-可见光谱、X射线光电子能谱、原子力显微镜和动态光散射对所制备的纳米粒子进行了表征。纳米颗粒悬浮液是透明的，其特征是相对于块状CuS具有蓝移的吸附边缘。对醋酸悬浮液进行的光散射测量表明，形成了平均直径约为5 nm的单分散纳米颗粒。
A novel method for the preparation of CuS nanoparticles based on the fast nucleation of the sulphide has been developed. The particles have been synthesized by reaction of thioacetic acid with water and copper carboxylates (acetate, propionate) in the corresponding carboxylic acid (acetic, propionic) as a solvent. The use of carboxylic acids presents several advantages: (i) the hydrolysis of the C-S bond is favoured thus producing a fast CuS supersaturation and a high nucleation rate; (ii) the mobility of the precursor molecules is limited so that nucleation events are favoured with respect to particle growth; (iii) the low dielectric constant of the medium stabilises the nanoparticles dispersion by reducing the critical coagulation concentration. The prepared nanoparticles were investigated by UV-Vis spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy and dynamic light scattering. The nanoparticle suspensions are clear and characterized by a blue-shifted adsorption edge with respect to bulk CuS. Light scattering measurements performed on acetic acid suspensions evidence the formation of monodispersed nanoparticles with an average diameter of about 5 nm.