In Situ Scanning Tunneling Microscopy for Analysis of Surface

用于表面分析的原位扫描隧道显微镜

• 批准号: 63850160
• 负责人: ITAYA Kingo
• 金额: $ 4.1万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63850160/
• 关键词: Scanning tunneling microscope(STM); Electrochemistry; In situ observation; Electrodeposition; Dissolution; Single crystal metal electrode

We have constructed a scanning tunneling microscope(STM) for operation in electrochemical conditions in electrolyte solutions. The electrochemical potentials of the tunneling tip and the substrate with respect to a reference electrode can be simultaneously controlled. The apparatus offers a new possibility for complete. in situ observation of electrode surfaces in electrolyte solutions under potentiostatic conditions. The electrochemical deposition and dissolution of Ag have been investigated with this instrument.In situ STM was applied to single-crystal platinum(111) surfaces both before and after electrochemical potential cycling in an aqueous sulfuric acid solution. Steps observed on a Pt(111)facet were usually located on nearly parallel straight lines or on the directions forming an angle of close to 60ﾟ, as expected for a surface with threefold symmetry. The height of each step was in accord with the monatomic step height of 0.238nm on the Pt(111) surface. Randomly oriented islands a few atoms in height were clearly observed on the terraces after five potential cyclings. It was suggested that Pt adatoms produced by the reduction of the oxide are coagulated on the terraces.The topography and the surface electronic structure of various semiconductor electrodes have been examined in aqueous solutions by means of STM. It is shown, for example, that hydrogen-terminated Si surface are resistant to oxidation even in aqueous solutions. The tunneling current-electrode potential(I- E)curve suggests the existence of surface states. STM images of photoelectrochemically oxidized surfaces have been obtained.

我们已经在电溶液中构建了用于电源的电化溶液中的电化学溶液中的显微镜（STM）。将原位STM应用于单晶铂（111）在硫酸水溶液中的电势循环。对于具有三重对称性的表面，每个步骤的高度与PT上的0.238nm的台阶（111）相符。通过STM显示了各种半导体电极的地形和各种半导体电极的表面结构。 I-e）曲线表明，已经获得了光电化学上氧化ididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididididind的表面状态。

项目成果

K.Itaya and E.Tomita: "Scanning Tunneling Microscopy of Semiconductor(n-ZnO)/Liquid Interface under Potentiostatic Conditions" Surf.Sci. 219. L515-L520 (1989)

K.Itaya 和 E.Tomita：“恒电位条件下半导体 (n-ZnO)/液体界面的扫描隧道显微镜” Surf.Sci。

K.Itaya;E.Tomita: Chemistry Letters. 285-288 (1989)

K.Itaya；E.Tomita：化学快报。

K. Itaya, K. Higaki and S. Sugawara: "In-Situ Scanning Tunneling Microscopy of Platinum Electrodes in Sulfuric Acid" Chem. Lett.421-424 (1988)

K. Itaya、K. Higaki 和 S. Sukawara：“硫酸中铂电极的原位扫描隧道显微镜” Chem。

K.Itaya;E.Tomita: Surface Science. 201. L507-L512 (1988)

K.Itaya；E.Tomita：表面科学。

K.Itaya and E.Tomita: "Scanning Tunneling Microscope for Electrochemistry-A New Concept for the In Situ Scanning Tunneling Microscope in Electrolyte Solutions" Surf.Sci. 201. L507-L512 (1988)

K.Itaya 和 E.Tomita：“用于电化学的扫描隧道显微镜 - 电解质溶液中原位扫描隧道显微镜的新概念”Surf.Sci。