Vacuum and Surface Science
Online ISSN : 2433-5843
Print ISSN : 2433-5835
Volume 61 , Issue 6
Showing 1-16 articles out of 16 articles from the selected issue
Preface
Transaction of the Joint Conference on Vacuum and Surface Science 2017 [III]
  • Riku TAMURA, Yuji HIRAI, Hiroyuki MAYAMA, Yasutaka MATSUO, Takahiro OK ...
    Type: Regular article
    2018 Volume 61 Issue 6 Pages 348-353
    Published: June 10, 2018
    Released: June 10, 2018
    JOURNALS FREE ACCESS

    There have been a lot of artificial superhydrophobic surfaces, however, those are difficult to use in daily purposes because of their brittle, stiff and breakable properties. We have been reported fabrication of superhydrophobic microstructured vulcanized rubber surfaces by using silicon microstructures as mold during their vulcanization process. Furthermore, the arrangement of microstructures could be repeatedly transformed from a hexagonal to linear patterns by elongations and superhydrophobicity was kept during elongation process. In this report, we prepared other type of superhydrophobic microstructured vulcanized rubber surfaces, which can be changed surface wettability by stretching. The superhydrophobic microstructured vulcanized rubber surfaces were prepared by using a silicon microstructures as mold. After observation of surface structures and wettability by laser microscopy and water contact angle analyzer, we took high-speed photography of water droplets felled to the rubber surfaces with different elongation rates, and theoretically discussed the differences of water behaviors.

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  • Kengo TAKASHIMA, Takahiro YAMAMOTO
    Type: Current Topics
    2018 Volume 61 Issue 6 Pages 354-359
    Published: June 10, 2018
    Released: June 10, 2018
    JOURNALS FREE ACCESS

    We theoretically and computationally examined carrier localization in semiconducting edge-disordered graphene nanoribbons (ED-GNRs) with sub-100 nm lengths that correspond to the typical gate length for field-effect transistors. We numerically found that the localization length of ED-GNRs is proportional to the square of ribbon width and inversely proportional to the edge-disordered concentration. Furthermore, we obtained an analytical formula of the localization length in terms of the GNR width and the roughness concentration.

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  • Keisuke ISHIZEKI, Kenji SASAOKA, Satoru KONABE, Satofumi SOUMA, Takahi ...
    Type: Current Topics
    2018 Volume 61 Issue 6 Pages 360-365
    Published: June 10, 2018
    Released: June 10, 2018
    JOURNALS FREE ACCESS

    We propose a new quantum transport simulation method to investigate electronic transport with thermal atomic vibrations. Advantages of the simulation method are applicable to a super-micro-scale open system and to the direct evaluation of quantum decoherence from time-dependent current unlike conventional methods. In the present study, we investigate ballistic-diffusive crossover of metallic carbon nanotubes at room temperature and estimate mean free path characterizing the crossover and confirm that the results coincide with previous studies. Moreover, utilizing usefulness of our method, we succeed in evaluation of coherent-incoherent crossover and estimation of phase coherence length characterizing the crossover.

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  • Yuri HASEGAWA, Yoichi YAMADA, Masahiro SASAKI
    Type: Current Topics
    2018 Volume 61 Issue 6 Pages 366-371
    Published: June 10, 2018
    Released: June 10, 2018
    JOURNALS FREE ACCESS

    Molecular arrangements and electronic states of well-ordered Dinaphtho[2,3-b:2′3′-f]Thieno[3,2-b]-Thiophene (DNTT) and picene thin film on single crystal were measured by means of scanning tunneling microscope (STM) and angle-resolved photoemission spectroscopy, respectively. DNTT and picene form single crystalline-like molecular arrangement on inert Au(111) substrate. Splitting of HOMO energy due to overlapping with adjacent molecules was suggested by ultraviolet photoemission spectroscopy (UPS) and density functional theory (DFT) calculation. On the other hand, one-dimensional ordering of those molecule was observed on anisotropic Ag(110) substrate. However, the HOMO band dispersion was found to be 200 meV at maximum, showing that the overlapping of HOMO was smaller in such arrangement comparing with that in their single crystal.

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  • Tatsuhiko YAJIMA
    Type: Current Topics
    2018 Volume 61 Issue 6 Pages 372-377
    Published: June 10, 2018
    Released: June 10, 2018
    JOURNALS FREE ACCESS

    According to the Wenzel model, the wetting properties can be tuned by controlling the two factors, the surface energy and the surface roughness. Evaluating the chemical and/or physical characteristics of PTFE surfaces before and after plasma treatment using XPS and FE-SEM, and radical species in plasma using OES cleared that an Ar/NH3-H2O plasma could provide that tuning, simultaneously generating a hydrophilic chemical structure and effective morphological roughness on PTFE surfaces and thus readily changing the highly hydrophobic surface to super hydrophilic.

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  • Kenichi UMEDA, Lidija ZIVANOVIC, Kei KOBAYASHI, Peter SPIJKER, Adam S. ...
    Type: Current Topics
    2018 Volume 61 Issue 6 Pages 378-383
    Published: June 10, 2018
    Released: June 10, 2018
    JOURNALS FREE ACCESS

    Local hydration structures around boundary edges on heterostructures are essential for development of novel functional materials and devices. Recently we succeeded in visualizing atomic-scale local 3D hydration structures by using ultra-low noise frequency-modulation atomic force microscopy. However, a time-consuming 3D measurement on uneven heterogeneous surfaces has never been reported due to experimental difficulties. In this work, we investigate the local hydration structures around boundary edge between oppositely charged surfaces of a phyllosilicate by the previously established fast and nondestructive protocol and molecular dynamics simulation.

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  • Noriyuki TAOKA
    Type: Current Topics
    2018 Volume 61 Issue 6 Pages 384-389
    Published: June 10, 2018
    Released: June 10, 2018
    JOURNALS FREE ACCESS

    Control of an insulator and Ge, InGaAs, or GaN interface for metal-oxide-semiconductor field-effect transistors (MOSFETs) to overcome the limit of the Si material properties and the electrical properties have been discussed. An importance of a suitable interface control for each material properties was maintained for deriving the material properties in the MOSFETs. The author hope that the suitable interface control based on the well-understood interface structure and material properties leads to a robust fabrication process.

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Regular article
Current Topics
  • Yasuyuki KOBAYASHI, Keiko GOTOH
    Type: Current Topics
    2018 Volume 61 Issue 6 Pages 396-403
    Published: June 10, 2018
    Released: June 10, 2018
    JOURNALS FREE ACCESS

    To control the contamination resistance of polymer surface, hydrophilization and hydrophobization of polymer were attempted by two atmospheric pressure plasma (APP) treatments. Poly(ethylene terephthalate) film and fabric were treated by using APP-oxidation with nitrogen gas and APP-coating with hexametyldisiloxane (HMDSO). Wettability of polymer film and fabric was evaluated by the sessile drop and the Wilhelmy method. The APP-coating increased water and oil repellency, and the APP-oxidation remarkably reduced water contact angle. Characterization of polymer surface was conducted by X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM), and scanning electron microscope (SEM). The antifouling property of fabrics was investigated using carbon black and red clay as a model particulate soils.

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