1996 Fiscal Year Final Research Report Summary
Development of In-situ Non-lenear Spectroscopic Probe microscope and its Application to the Surface Phenomena
| Project/Area Number |
07554088
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
分離・精製・検出法
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
TERAMAE Norio Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (70114569)
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| Co-Investigator(Kenkyū-buntansha) |
SUGIMURA Hiroyuki Nikon Co.Ltd., Tsukuba Laboratory, Chief Researcher, 筑波研究所, 主任研究員
NISHIZAWA Seiichi Tohoku University, Graduate School of Science, Assistant, 大学院・理学研究科, 助手 (40281969)
UCHIDA Tatsuya Tohoku University, Graduate School of Science, Assistant, 大学院・理学研究科, 助手 (30261548)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Scannning Probe Microscope / Scanning Tunnel Microscope / Non-Linear Laser Spectroscopy / Electrochemistry / Sum Frequency Generation / Second Harmonic Generation |
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| Research Abstract |
Chemical and physical processes occured at solid-liquid interfaces have been paid attentions from the fundamental and technological points of view. In recent years, scanning probe microscopes and non-linear surface spectroscopies have began to reveal new aspects for the interfacial phenomena. In the present study, chemical reactions occured at electrode surfaces were studied at a molecular level by scanning tunnel microscope (STM) and non-linear laser spectroscopies such as second harmonic generation and sum frequency generation (SFG).
In the electrochemical STM study, several preparation methods were examined for obtaining an optimum tip which can be used for the measurements of STM and cyclic voltammetry. The tips prepared were also evaluated by SEM.An electrode was immersed in an aqueous solution of Fe (III) protoporphyrin (Fe-PP), and then transferred to an electrochemical cell after rinsing with distillled water. STM meaaurements were carried out in a buffer solution (pH 10). It wa
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s found that Fe-PP absorbed on a graphite electrode showed multi-layred structure when the amount of adsorption is rich, and that the well-ordered structure having a regular lattice constant was observed for each adlayr. In contrast to this observation, Fe-PP was found to form a linear chain when the amount of adsorbed molecules is poor. These observations clarified the chemical process occured at the electrode surface, that is, the physical structures of Fe-PP depend on the coverage.
To obtain chemical structure of adsorbate, resonant second harmonic spectroscopy was applied to the analysis of redox behaviors of methylene blue at the sulfer coated electrode surface. As a result, dependence of amount of adsorbate on the orientation and electronic structure could be discussed. As for SFG,measurement system was developped based on a pulsed Nd : YAG laser with a differential frequency generator, and fundamental factors which affect the measurements were examined. Although spectral resolution was not enough high, vibrational spectra of octadecanetiol on Au (111) electrode could be measured with a resolution of ca 20 cm^<-1>.
As mentioned above, chemical processes occured at solid-liquid interfaces could be analyzed at a molecular level by combining the electrochemical STM with surface sensitive non-linear laser spectroscopies. Less
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Research Products
(3 results)
