Thermodynamic aspects of bis(3-sulfopropyl) disulfide and 3-mercapto-1-propanesulfonic acid in Cu electrodeposition
- Authors
- Shen, Huizi; Kim, Hoe Chul; Sung, Minjae; Lim, Taeho; Kim, Jae Jeong
- Issue Date
- May-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Cu electrodepositlon; Accelerator; SPS; MPS; Reduction potential
- Citation
- JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v.816, pp.132 - 137
- Journal Title
- JOURNAL OF ELECTROANALYTICAL CHEMISTRY
- Volume
- 816
- Start Page
- 132
- End Page
- 137
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/31713
- DOI
- 10.1016/j.jelechem.2018.03.048
- ISSN
- 1572-6657
- Abstract
- Organic additives play an important role in regulating film growth and properties in Cu electrodepositlon. 3-Mercapto-1-propane sulfonate (MPS) and its dimer bis(3-sulfopropyl) disulfide (SPS) are representative accelerators that promote Cu electrodeposition rate. In this study, the formal reduction potential of SPS to MPS was determined by measuring the equilibrium constants of thiol-disulfide interchange reactions with the reference thiol/disulfide pairs by H-1 nuclear magnetic resonance (H-1 NMR) spectroscopy. The calculated formal reduction potential of SPS to MPS was 0.153 V (vs. standard hydrogen electrode). Based on this calculation, the cell potentials of Cu(I)(thiolate) formation reaction with either SPS or MPS, which is a key reaction in accelerating mechanism, were also estimated by ultraviolet-visible absorption and H-1 NMR spectroscopies: they were found to be 0.202 V and 0.214 V for SPS and MPS, respectively. The positive cell potential indicates that the formation of Cu(I)(thiolate) complexes is thermodynamically favorable in the presence of additives.
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Collections - College of Engineering > Department of Chemical Engineering > 1. Journal Articles
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