Hyomen Kagaku
Online ISSN : 1881-4743
Print ISSN : 0388-5321
ISSN-L : 0388-5321
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Volume 28, Issue 7
Displaying 1-12 of 12 articles from this issue
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Preface
Transaction of the 26th Conference on Surface Science [I]
Originals
  • XPS Depth Profile Analysis of ArF Immersion Resists by using C60 Ion Beam
    Yuichi YAMAMOTO, Naoko SHIROTA, Kiyoshi YAMAMOTO
    Article type: Original
    2007 Volume 28 Issue 7 Pages 348-353
    Published: July 10, 2007
    Released on J-STAGE: July 22, 2007
    DOIhttps://doi.org/10.1380/jsssj.28.348
    JOURNAL FREE ACCESS
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    Argon ion sputtering is one of the most accepted techniques for depth profiling in practical X-ray photoelectron spectroscopy (XPS) analysis, while this technique is known to cause severe degradation especially with organic materials. Sputtering system using buckminsterfullerene (C60) ion beam has recently been introduced to XPS apparatus as a new sputtering tool for depth profiling. It enables the XPS depth analysis of organic materials such as photoresists without chemical damages. In this paper, the XPS analysis using the C60 ion sputtering was applied to examine the depth distributions of a fluoropolymer in ArF immersion resists to clarify the mechanism of the water-repellency change between the co-polymer and blend polymer. In addition, the depth profiling of the resist is compared to those observed with other techniques such as angle resolved XPS analysis and XPS analysis on the gradient shaved surfaces.
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  • Surface Dynamics of Water Monomers and Dimers on Pt(111) Surface
    Kenta MOTOBAYASHI, Chikako MATSUMOTO, Yousoo KIM, Maki KAWAI
    Article type: Original
    2007 Volume 28 Issue 7 Pages 354-360
    Published: July 10, 2007
    Released on J-STAGE: July 22, 2007
    DOIhttps://doi.org/10.1380/jsssj.28.354
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    Isolated water molecules such as monomers and dimers on Pt(111) surfaces with low degree of coverage were directly observed by scanning tunneling microscopy (STM) at low temperatures. A water monomer is shown as a single protrusion in the STM image. While, a dimer appears as a 6-fold symmetric “flower-like” protrusion, which can be explained by the model that one of the water molecules in the dimer is rotating around the other. The adsorption sites of a dimer were also determined as both molecules on atop sites. Indeed, we have succeeded in forming and breaking dimers by exciting molecular vibrations with inelastically tunneled electrons from an STM tip. It turns out that a dimer is more stable than a monomer when the sample bias voltage is shifted. We also report on vibrationally induced lateral hopping motion of both monomer and dimer molecules by injecting tunneling electron.
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  • Control of the Stability of Ni and Pd Atomic Contact by Electrochemical Potential
    Manabu KIGUCHI, Tatsuya KONISHI, Kei MURAKOSHI
    Article type: Original
    2007 Volume 28 Issue 7 Pages 361-366
    Published: July 10, 2007
    Released on J-STAGE: July 22, 2007
    DOIhttps://doi.org/10.1380/jsssj.28.361
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    We have mechanically fabricated Ni and Pd nanoconstrictions and investigated their conductance characteristics in solution under electrochemical potential control. When the electrochemical potential of the Ni and Pd nanoconstrictions was kept at the hydrogen evolution potential, clear features appeared at 1−1.5 G0 (G0 = 2e2/h) and at 1 G0 in the conductance histogram of Ni and Pd, respectively. Based on the experimental results previously obtained in ultra high vacuum at ultra low temperature and theoretical calculation, the peaks observed in the present system (1−1.5 G0 for Ni, 1 G0 for Pd) were assigned to the mono atomic contact. While the fabrication of mono atomic contacts of Ni and Pd is difficult at room temperature, the mono atomic contacts could be stabilized in solution by hydrogen adsorption. The stability of the Pd atomic contact was qualitatively analyzed using conductance traces. The atomic contact could be stretched 0.4 nm in length just before breaking, suggesting the formation of the Pd wire.
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  • NC-AFM and STM Studies on the Rutile TiO2(011) Surface
    Toshitaka KUBO, Hideo ORITA, Hisakazu NOZOYE
    Article type: Original
    2007 Volume 28 Issue 7 Pages 367-371
    Published: July 10, 2007
    Released on J-STAGE: July 22, 2007
    DOIhttps://doi.org/10.1380/jsssj.28.367
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    Surface geometric structures of rutile TiO2(011) are determined by a combination of non-contact atomic force microscopy (NC-AFM), scanning tunneling microscopy (STM) and density functional calculations. Microfaceting missing-row structural models proposed instead of a previous titanyl (Ti=O) double-bond model can explain the experimental results very well. Calculated images for NC-AFM and STM are in good agreement with the experimental data. Decreasing the density of dangling bonds stabilizes the surface energy, which results in the microfaceting missingrow (n×1) reconstructions.
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  • Fabrication of Metallic Nanoarrays using DNA Templates
    Hidenobu NAKAO, Futoshi IWATA, Hidenori KARASAWA, Hideki HAYASHI, Kazu ...
    Article type: Original
    2007 Volume 28 Issue 7 Pages 372-377
    Published: July 10, 2007
    Released on J-STAGE: July 22, 2007
    DOIhttps://doi.org/10.1380/jsssj.28.372
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    We report a simple method for fabricating metal nanoarrays with DNA templates. After DNA-stretching and fixation on surfaces, highly aligned and integrated Au nanoarrays were fabricated via electroless depositions of Au on DNA. The direct visualization of metallic nanoarrays and interaction with optical near-filed have been studied by atomic force microscopy (AFM) and scanning near-field optical microscopy (SNOM). The resulting metallic nanoarrays are attractive prospects in nano-optics and an important step toward the construction of plasmon waveguids.
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  • Vibrationally Induced Inelastic Structures in Laser Photoemission Spectra
    Ryuichi ARAFUNE, Kei HAYASHI, Noriaki TAKAGI, Maki KAWAI, Yoichi UEHAR ...
    Article type: Original
    2007 Volume 28 Issue 7 Pages 378-384
    Published: July 10, 2007
    Released on J-STAGE: July 22, 2007
    DOIhttps://doi.org/10.1380/jsssj.28.378
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    We have succeeded in observing vibrationally induced inelastic structures in the photoemission spectra of carbon monoxide or oxygen covered Cu(001) surfaces excited by laser light. The structure appears as a step at the vibrational energy below the Fermi level. We found that the CO/Cu(001) spectra contain two step structures arising from the C-O internal stretching mode and the frustrated rotation mode. These steps shift to lower energy for 13C18O. In the O/Cu(001) spectra we have observed the inelastic structures originating from not only adsorbate-substrate vibrations but also substrate surface phonons.
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  • Fabrication of a Planar Type Patch-clamp Biosensor using Silicon on Insulator Substrate
    Toshifumi ASANO, Zheng Long ZHANG, Hidetaka UNO, Ryugo TERO, Koichi SU ...
    Article type: Original
    2007 Volume 28 Issue 7 Pages 385-390
    Published: July 10, 2007
    Released on J-STAGE: July 22, 2007
    DOIhttps://doi.org/10.1380/jsssj.28.385
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    We have fabricated a planar type ion channel biosensor useful for the high throughput screening by using SOI (Silicon On Insulator) substrates. The micro-pore of about 1μm diameter was formed through the SOI substrate and controlled the structure of the pore. The substrate was assembled into the micro fluid circuit. Comparing with classical patch-clamp using the pipette, the planar type patch-clamp has advantages not only in the miniaturization and the high integration, but also in easiness of intracellular fluids exchange and of simultaneous measurement of ion channel current and fluoresce imaging. The HEK293 (Human Embryonic Kidney 293) cell with transfected TRPV1 (transient receptor potential vanilloid type 1) channels, which are mainly expressed in sensory nerve cells, was positioned on the micro-pore, and the capsaicin, which is a pungent ingredient of the hot pepper, was added to the external cell solution as a ligand molecule, then the whole-cell current of the ion channel was measured.
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