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Seeded growth fabrication of Cu-on-Si electrodes for in situ ATR-SEIRAS applications |
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| Authors: | Hui-Feng Wang Sheng-Juan Huo Qun-Jie Xu |
| Affiliation: | a Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials and Department of Chemistry, Fudan University, Shanghai 200433, China b Department of Enviromental Engineering, Shanghai University of Electric Power, Shanghai 200090, China c Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan |
| Abstract: | A seeded-growth approach has been developed to fabricate a Cu nanoparticle film (simplified hereafter with nanofilm) on Si for electrochemical ATR surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS). The approach comprises an initial activation of the reflecting plane of hemicylindrical Si prism by introducing a Cu seed layer in a CuSO4-HF solution and the subsequent electroless deposition of the Cu nanofilms from an electroless Cu plating bath. The as-deposited Cu nanofilm exhibited strong SEIRA effect for the CO probe and interfacial free H2O. ATR-SEIRAS was also applied to characterize the adsorbed geometries of pyridine at the Cu/electrolyte interface. Only vibrational bands assignable to the A1 symmetry modes were detected in the entire potential window investigated, suggestive of an end-on adsorption via the ring N-atom on a Cu electrode. |
| Keywords: | ATR-SEIRAS Cu nanofilm electrode Si Seeded-growth Carbon monoxide Pyridine |
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