1,3-二甲基-2-咪唑啉酮-AlCl_(3)-Cu_(2)O离子液体电沉积金属铜

Electrodeposition of copper in 1,3-dimethyl-2-imidazolidinone AlCl_(3)-Cu_(2)O ionic liquid

为找到一种电沉积金属铜的新方法,选用1,3-二甲基-2-咪唑啉酮(DMI)、AlCl_(3)和Cu_(2)O(摩尔比为90∶10∶4)的溶剂化离子混合液体进行铜的恒电位电沉积,并分析了电解质的离子结构、电导率、黏度和密度等。拉曼光谱和核磁共振分析表明DMI-AlCl_(3)-Cu_(2)O体系中存在[AlCl2(DMI)_(4)]^(+)、AlCl_(3)(DMI)2和[AlCl_(4)]^(-)等离子团,DMI-AlCl_(3)-Cu_(2)O体系的电导率、黏度和密度随温度在323~373 K区间内呈线性变化。循环伏安研究表明,铜的起始还原电位为-0.4 V(vs Al),还原峰电位为-1.35 V;在-1.1 V至-1.4 V条件下恒电位电沉积得到金属铜,在-1.1 V和-1.4 V电位下电沉积得到的产物表面较平整,在-1.2 V和-1.3 V电位下电沉积得到的产物为纳米针状结构的铜颗粒,直径约为20~40μm。

In order to find a new method for electrodeposition of metallic copper,1,3-dimethyl-2-imidazolinone(DMI)-AlCl_(3)-Cu_(2)O solvated ionic liquid with molar ratio of 90∶10∶4 was chosen for the potentiostatic electrodeposition of copper in the paper,and the ionic structure,conductivity,viscosity and density of the electrolyte were analyzed.Raman spectroscopy and NMR analysis results show the presence of[AlCl2(DMI)4]+,AlCl_(3)(DMI)_(2),and[AlCl_(4)]^(−)species in the DMI-AlCl_(3)-Cu_(2)O system.The conductivity,viscosity and density of the DMI-AlCl_(3)-Cu_(2)O system vary with temperature by a linear law at 323−373 K.The cyclic voltammetry study results show that−0.4 V is the starting reduction potential of copper,and the reduction peak appears at−1.35 V.Copper metal can be obtained by potentiostatic electrodeposition at potentials ranging from−1.1 V to−1.4 V,with diameters of about 20−40μm.The coatings obtained at−1.1 V and−1.4 V have a flat surface,and copper particles with nano-needle-like structures can be obtained at−1.2 V and−1.3 V.