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Structural Study of Electrochemically Deposited Cu on p-GaAs(100) in H2SO4 Solution by In Situ Surface-Sensitive X-ray Absorption Fine Structure Measurements
| Title: | Structural Study of Electrochemically Deposited Cu on p-GaAs(100) in H2SO4 Solution by In Situ Surface-Sensitive X-ray Absorption Fine Structure Measurements |
| Authors: | Tamura, Kazuhisa Browse this author | | Oyanagi, Hiroyuki Browse this author | | Kondo, Toshihiro Browse this author | | Koinuma, Michio Browse this author | | Uosaki, Kohei Browse this author →KAKEN DB |
| Issue Date: | 28-Sep-2000 |
| Publisher: | American Chemical Society |
| Journal Title: | Journal of Physical Chemistry B |
| Volume: | 104 |
| Issue: | 38 |
| Start Page: | 9017 |
| End Page: | 9024 |
| Publisher DOI: | 10.1021/jp0011286 |
| Abstract: | The local structures of electrochemically deposited Cu on p-GaAs(100) of various coverages in 0.1 M H2SO4 solution containing 0.1 mM CuSO4 have been investigated by in situ surface-sensitive X-ray absorption fine structure (XAFS). The Cu K-edge extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) were obtained over a wide range of coverages, i.e., several monolayers down to 1/20 monolayer. The results of multishell parameter fitting of EXAFS data showed that Cu nanoclusters with a short Cu-Cu bond length were formed on the p-GaAs(100) electrode below the critical surface coverage of 0.25 monolayer. The nanoclusters were found to be coordinated with the oxygen atoms of water molecules and/or sulfate anions. They were formed in an early stage of electrochemical deposition and grew in size to approach a densely packed coordination with an fcc structure. XANES spectra showed that the coordination number changed systematically but that a metallic state was retained throughout the electrochemical deposition. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/50235 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 魚崎 浩平
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