Study of chemical evolution process by the fabrication of model soil surfaces

通过制作模型土壤表面来研究化学演化过程

• 批准号: 11640485
• 负责人: EGAWA Chikashi
• 金额: $ 2.37万
• 依托单位: Utsunomiya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640485/
• 关键词: NiO (111) thin film; Surface formate; Surface isocyanate; Magnetic thin film; STM; double modulation FT-IRS; RHEED; モデル酸化物表面; 偏光変調反射赤外分光; ギ酸

1. Fabrication of model oxide surfacesThe growth condition of NiO (111) films on Ni (100) surface has been established. The NiO (111) films grow preferentially along the [011] direction of Ni (100) substrate at 300 K for the oxygen exposure above 500 L.The oxide films have ca. 11% shorter lattice spacing than in the bulk of NiO.Surface structure model for Cu (100) c (4x2)-O LEED pattern is newly proposed by the observation of atomic images in STM.RHEED patterns from magnetic thin films grown on MgO (100) surface show the morphological change of films depending on the thickness and annealing temperature.2. Molecular orientation on model oxide surfacesThe adsorption and decomposition reaction of formic and isocyanic acids on Ni (100) and NiO (111) oxide films have been investigated by double-modulation FT-IR reflection absorption method. Surface formate derived from formic acid was perpendicularly adsorbed on both surfaces showing the symmetric OCO stretch mode. On the contrary, surface NCO from the dissociative adsorption of isocyanic acid inclined on NiO (111) surface estimated from the NCO asymmetric stretch mode.

1.模型氧化面的制备建立了NiO(111)膜在Ni(100)表面的生长条件。在300K下，当氧暴露在500L以上时，NiO(111)薄膜沿Ni(100)衬底的[011]方向优先生长。氧化膜的晶格间距比NiO体相的晶格间距小约11%。通过对STM中原子像的观察，新提出了Cu(100)c(4x2)-O LEED图形的表面结构模型。用双调制FT-IR反射吸收法研究了甲酸和异氰酸在Ni(100)和NiO(111)氧化膜上的吸附和分解反应。甲酸衍生的表面甲酸盐垂直吸附在两个表面上，呈现对称的OCO拉伸模式。相反，从NCO不对称拉伸模式估算，异氰酸解离吸附产生的NCO在NiO(111)表面发生倾斜。

项目成果

C.Egawa: "Adsorption and reaction of ethylene and hydrogen on Rh (100) surface"Surface Science. 454-456. 222-226 (2000)

C.Ekawa：“乙烯和氢在Rh(100)表面上的吸附和反应”表面科学。

C.Egawa: "Adsorption and reaction of ethylene and hydrogen on Rh (100) surface"Surface Sci.. 454-456. 222-226 (2000)

C.Ekawa：“乙烯和氢在Rh(100)表面上的吸附和反应”表面科学.454-456。

C,Egawa.H.Iwai: "Ethylene hydrogenation on fcc ultra thin Fe films on a Rh (001) surface "Studies in Surface Science and Catalysis. (2001)

C,Ekawa.H.Iwai：“Rh (001) 表面上的 fcc 超薄 Fe 薄膜上的乙烯氢化”表面科学和催化研究。

C.Egawa, S.Endo, H.Iwai and S.Oki: "Ethylene hydrogenation on Pt thin films on Ni (100) surface"Surface Sci.. 474. 14-20 (2001)

C.Ekawa、S.Endo、H.Iwai 和 S.Oki：“Ni(100) 表面 Pt 薄膜上的乙烯氢化”Surface Sci.. 474. 14-20 (2001)

C.Egawa,H.Iwai: "Ethylene hydrogenation on fcc Co and Fe thin films grown on Ni(100)"Surface Science. 454-456. 347-351 (2000)

C.Ekawa、H.Iwai：“在 Ni(100) 上生长的 fcc Co 和 Fe 薄膜上的乙烯氢化”表面科学。