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Citation: YANG Fang-Zu, YANG Bin, LU Bin-Bin, HUANG Ling, XU Shu-Kai, ZHOU Shao-Min. Electrochemical Study on Electroless Copper Plating Using Sodium Hypophosphite as Reductant[J]. Acta Physico-Chimica Sinica, ;2006, 22(11): 1317-1320. doi: 10.1016/S1872-1508(06)60065-X shu

Electrochemical Study on Electroless Copper Plating Using Sodium Hypophosphite as Reductant

1.
State Key Laboratory of Physical Chemistry of the Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China

Received Date: 25 April 2006
Available Online: 6 November 2006

The process of electroless copper plating, using sodium hypophosphite as the reductant and sodium citrate as the chelating agent, was studied using linear sweep voltametry. The effects of temperature, pH, and concentration of nickel ion on the anodic oxidation of hypophosphite and the cathodic reduction of copper ion were tested. The results indicated that the higher ultrasonic bath temperature accelerated both the anodic and the cathodic processes. The increasing pH value promoted hypophosphite oxidation, whereas it blocked the reduction of the copper ion. The nickel ion not only intensively catalyzed the hypophosphite oxidation, but also codeposited with the copper ion to form the Cu-Ni alloy. With regard to its catalytic activity, this alloy enabled the continuation of the electroless copper plating reaction.
- Electroless copper plating;Sodium hypophosphite;Re-active agent;Anodic oxidation;Cathodic reduction
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