表面科学
Online ISSN : 1881-4743
Print ISSN : 0388-5321
ISSN-L : 0388-5321
35 巻 , 7 号
選択された号の論文の14件中1~14を表示しています
巻頭言
第33回表面科学学術講演会特集号 [I]
  • 胡 春平, 嶋田 恵, 岡本 裕司, 土方 啓暢, 渡辺 一之
    原稿種別: 論文
    2014 年 35 巻 7 号 p. 340-344
    発行日: 2014/07/10
    公開日: 2014/07/23
    ジャーナル フリー
    We studied the adsorption and dynamical behavior of pyrene molecules on single-wall carbon nanotubes (CNT), using both first-principles density functional theory (DFT) and classical molecular dynamics methods. For the energetics, the van der Waals corrected DFT-D2 method was used to determine the stable adsorption sites and adsorption energies. In the (6,6) CNT/pyrene system, the adsorption energy was determined to be 0.73 eV by DFT-D2, in comparison to the result of 0.46 eV within local density approximation. This has shown that it is hard to peel pyrene from CNT at room temperatures. On the other hand, finite-temperature nonequilibrium molecular dynamics simulation has revealed that following the temperature gradient the pyrene molecule can readily move along the CNT sidewall, indicating that it is plausible to peel pyrene when it has moved to the end of the CNT. We have also studied the effect of pyrene adsorption on the thermal conductivity of CNT.
  • 半田 紗織, 鈴木 悠宜, 千葉 駿人, 二又 政之
    原稿種別: 論文
    2014 年 35 巻 7 号 p. 345-350
    発行日: 2014/07/10
    公開日: 2014/07/23
    ジャーナル フリー
    A gap mode in surface enhanced Raman scattering (SERS) can provide single molecule sensitivity and spatial resolution of a few nanometers. To establish a gap mode Raman spectroscopy, we investigated three distinct geometries of a flocculate of silver nanoparticles (AgNP), a gap mode with a metal substrate/molecule/metal nanoparticle sample under an external, and attenuated total reflection (ATR) geometry. We succeeded to elucidate adsorbed state of different thiol molecules in flocculates of AgNPs as well as counter ions in solutions. A large number of AgNPs were immobilized on Ag films via various thiol molecules using van der Waals and electrostatic interaction, which provided enormous SERS enhancement of 108-109 at a nanogap. A propagating surface plasmon (PSP) combined with a gap mode under ATR geometry yielded significantly larger SERS enhancement than that under an external geometry.
  • 藤井 麻樹子, 宍戸 理恵, 鳥居 聡太, 中川 駿一郎, 瀬木 利夫, 青木 学聡, 鈴木 茂, 松尾 二郎
    原稿種別: 論文
    2014 年 35 巻 7 号 p. 351-355
    発行日: 2014/07/10
    公開日: 2014/07/23
    ジャーナル フリー
    In recent years, the analysis of biological samples has been extensively performed in pharmacokinetic and metabolic studies. The use of Secondary Ion Mass Spectrometry (SIMS) with conventional monomer ion beams, such as Ar+, Cs+ or Ga+, in biological applications is difficult because of the low secondary ion yield of large organic molecules and the complicated fragment ion signals. The use of cluster ions as primary projectiles in SIMS has spread dramatically in the past decade. Bismuth (Bi) cluster ions are now the most familiarized primary ions in cluster SIMS because of the high convergence property and the high molecular ion yield. Argon gas cluster ion beam (Ar-GCIB) is also one of the most attractive primary projectiles for biological application because of the soft sputtering without damage accumulation. However, our knowledge of detection limit and sensitivity is still insufficient for the practical analysis of complex biological samples with cluster SIMS. In addition, imaging mass spectrometry with high spatial resolution is crucially essential for tissue and cell analysis. In this study, lipid standard samples were measured in order to examine the detection limit and the spatial resolution of our Ar-GCIB SIMS, and the results were compared with those of the commercial Bi cluster SIMS. The results indicated that Ar-GCIB SIMS has a capability to obtain the valuable information in biological analysis, however, the improvement on spatial resolution and sensitivity is still required.
  • 花田 明紘, 三浦 寛基, 野津 武志, 大沢 仁志, 伊奈 稔哲, 鈴木 基寛, 河村 直己, 水牧 仁一郎, 宇留賀 朋哉, 木村 滋, ...
    原稿種別: 論文
    2014 年 35 巻 7 号 p. 356-360
    発行日: 2014/07/10
    公開日: 2014/07/23
    ジャーナル フリー
    We fabricated resistive random access memory (ReRAM) structure of Pt/Bi2Sr2CaCu2O8+δ(Bi−2212) bulk single crystal/Pt, and investigated Cu electronic states of the Bi−2212 by X−ray absorption near−edge structure. Hydrogen atoms are efficiently introduced into Bi−2212 with the assistance of catalytic effect of Pt by annealing Pt/Bi−2212 structure in hydrogen atmosphere. Resistive switching effect was generated by the reduction of Cu valence due to the formation of chemical bonding between in−plane oxygen of CuO2 layer and hydrogen (O−H bond), which corresponds to the formation of Cu(OH)2−like material, in the Bi−2212 in the vicinity of the Pt electrode. It is, therefore, suggested that the resistive switching effect occurred by bonding/dissociation of the O−H bond due to the migration of the hydrogen ions.
  • 山下 良之, 吉川 英樹, 知京 豊裕, 小林 啓介
    原稿種別: 研究紹介
    2014 年 35 巻 7 号 p. 361-364
    発行日: 2014/07/10
    公開日: 2014/07/23
    ジャーナル フリー
    We employed hard X-ray photoelectron spectroscopy in operating devices. This method allows us to investigate bias dependent electronic states while keeping device structures intact. Using this method we have investigated electronic states and potential distribution in a Pt gate metal/high-k gate stack structure under device operation. We have found that a potential gradient was formed at the Pt/HfO2 interface by analyzing the shifts of the core levels as a function of the applied bias voltage. Angle resolved photoelectron spectroscopy revealed that a SiO2 layer was formed at the Pt/HfO2 interface, which is the origin of the potential gradient formed at the Pt/HfO2 interface.
  • 三宅 丈雄, 小川 雄大, 西澤 松彦
    原稿種別: 研究紹介
    2014 年 35 巻 7 号 p. 365-370
    発行日: 2014/07/10
    公開日: 2014/07/23
    ジャーナル フリー
    We have developed a totally flexible, sheet-shaped biofuel cell by stacking a bioanode fabric, a hydrogel sheet containing electrolyte and fuel (fructose), and an O2-diffusion biocathode fabric. The results presented include two strategies to improve the performance of the device. (1) An anode modified with an appropriate CNT dispersion showed higher activity. (2) The gas-diffusion biocathode was improved by optimizing its hydrophobicity. The improved biofuel cell sheet produced a maximum power density of 1.0 mW cm−2 at 0.36 V even when bent. Such a flexible, sheet-shaped power source could be combined in the future with flexible electronic to make wearable devices.
  • 一柳 光平, 関口 博史, 野澤 俊介, 佐藤 篤志, 足立 伸一, 佐々木 裕次
    原稿種別: 研究紹介
    2014 年 35 巻 7 号 p. 371-376
    発行日: 2014/07/10
    公開日: 2014/07/23
    ジャーナル フリー
    We report direct observations of laser-induced coherent lattice vibration in gold nanocrystals on the fused quartz substrate using picoseconds time-resolved X-ray diffraction. The single-layered gold nanocrystal film is formed by means of vapor-evaporated gold film. The lattice constant change and vibration period of lattice constants of 111, 200, 311, 220, and 222 of gold nanocrystals after femtosecond laser irradiation at 400 nm are almost similar within nanosecond region. These results indicate that the strain generated from laser-induced expansion within a few picoseconds and propagates into the finite size gold crystals. The feature of these photo-induced lattice vibrations in gold nanocrystals is discussed.
  • 岡 博文, Safia OUAZI, Sebastian WEDEKIND, Guillemin RODARY, Dirk SANDER, ...
    原稿種別: 研究紹介
    2014 年 35 巻 7 号 p. 377-382
    発行日: 2014/07/10
    公開日: 2014/07/23
    ジャーナル フリー
    An outstanding challenging in nanomagnetism is the quantitative understanding of magnetization reversal process of nanostructures. We investigate the magnetization reversal of individual Co islands on Cu(111). We measure switching fields HSW of single Co islands using spin-polarized scanning tunneling microscopy/spectroscopy at 8 K. The switching field changes with island size. The switching field increases with size and reaches a maximum value of 2.4 T at a size of 5500 atoms, and decreases for larger islands. To discuss magnetization reversal processes, we extract the energy barrier ΔE for magnetization reversal as a function of island size. Our analysis reveals a crossover of the magnetization reversal from an exchange-spring behavior to domain wall formation with increasing size at around 7500 atoms.
論文
連載企画
資源問題と表面科学
  • 谷 泰弘
    2014 年 35 巻 7 号 p. 389-390
    発行日: 2014/07/10
    公開日: 2014/07/23
    ジャーナル フリー
    ガラスを鏡面に研磨する際に,その相性の良さから酸化セリウムが多用されている。しかし,酸化セリウムはレアアースの一つであり,供給リスクが高い。そこで,希少金属代替材料開発プロジェクトの対象鉱種に選択された。これに対して,コンソーシアムを形成し研究開発を行った結果,代替砥粒としては酸化ジルコニウムが有望であることが判明した。その化学的作用および滞留性を高める添加剤を付与した結果,酸化セリウムと同等の研磨特性を得た。また砥粒の滞留性に着目して研磨パッド材質の見直しを行った結果,エポキシ樹脂研磨パッドが従来のウレタン樹脂研磨パッドよりはるかに優れる研磨特性を有することが判明した。
談話室
海外研究体験記
表面科学技術者資格認定試験例題
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