Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (09): 1733-1738.doi: 10.3866/PKU.WHXB20080937

• Note • Previous Articles    

Influence of CO2-3 on Copper Electrodeposion from 1-Hydroxyethylidene-1,1-diphosphonic Acid Baths

ZHENG Jing-Wu; JIANG Mei-Yan; QIAO Liang; JIANG Li-Qiang; SHENG Jia-Wei; ZHANG Cheng   

  1. College of Chemistry and Materials Engineering, Zhejiang University of Technology, Hangzhou 310032, P. R. China
  • Received:2008-03-28 Revised:2008-05-22 Published:2008-09-10
  • Contact: JIANG Li-Qiang

Abstract: The effect of CO2-3 on copper electrodeposits from 1-hydroxyethylidene-1,1-diphosphonic acid (HEDPA) baths was investigated over a wide range of concentration by electrochemical measurements, XRD, and IR spectra of the complex. It could be seen from potentiodynamic polarization curves that CO2-3 in the bath could not only enhance the cathodic polarization but also promote anodic dissolution. The X-ray diffraction results indicated the changing of preferred orientation of the copper deposits, from a preferential growth orientation (222) plane containing little CO2-3 to (111) plane containing more CO2-3. The IR spectra of the solid complex purified from the bath showed that CO2-3 could enter the complex and stabilize Cu2+ in the structure as the second ligand, so the potential of copper deposition was negatively shifted and the (111) plane orientation was preferred.

Key words: 1-Hydroxyethylidene-1,1-diphosphonic acid, Copper deposits, Preferred orientation