CO32-对羟基乙叉二膦酸体系铜电结晶的影响

采用循环伏安和计时安培法研究了羟基乙叉二膦酸(HEDPA)镀铜液中铜在玻碳电极上电结晶的初期行为。结果表明：羟基乙叉二膦酸(HEDPA)镀铜体系中，铜的电沉积过程经历了晶核形成过程；当溶液中不含CO32-时，其电结晶按连续三维成核方式进行，而CO32-的加入，使得铜电结晶按瞬时三维成核方式进行；成核数密度都随着电位的提高而增加。这可能是CO32- -以第二配体形式进入HEDPA和Cu2+构成的络合结构，从而形成更稳定的络合物吸附在电极表面所致。

Influence of CO3 2- on Copper Electrocrystallization from 1-Hydroxyethylidene-1,1-Diphosphonic Acid Baths

The initial stage of copper electrodeposition and the influence of CO32- ions on the nucleation and growth of copper on glass carbon from a 1-hydroxyethylidene-1,1-diphosphonic acid (HEDPA) electrolyte was investigated using cyclic voltammetry (CV) and chronoamperometry (CA) techniques. The nucleation is in a good agreement with the progressive nucleation and three-dimensional (3D) growth for the solutions without CO32-, while instantaneous nucleation with three-dimensional growth was found for the electrolyte with CO32-.There was an increase in the nuclear number density of nuclei at the surface with the increase of potential.The possible explanation for this result was that CO32- could enter the complex to stable the Cu in the structure as the second ligand and formed a kind of more stable complex compound ,which was adsorbed on the surface of electrode.