表面科学
Online ISSN : 1881-4743
Print ISSN : 0388-5321
ISSN-L : 0388-5321
37 巻 , 12 号
選択された号の論文の12件中1~12を表示しています
巻頭言
特集: 最新の化学・物理イメージング
  • 河野 行雄
    原稿種別: 研究紹介
    2016 年 37 巻 12 号 p. 586-592
    発行日: 2016/12/10
    公開日: 2016/12/23
    ジャーナル フリー

    Near-field terahertz (THz) spectroscopic imaging, which enables sub-wavelength analysis, is a powerful method for investigating nano- and micro-scale objects such as nanomaterials, polymers, cells, and biomolecules. However, near-field imaging in the THz region remains to be fully explored, compared to other frequency regions. This review explains our chip-type near-field THz spectroscopic imaging technology. We develop a collection-mode near-field THz imager, which is based on an evanescently coupled THz sensor with a two-dimensional electron gas. The utilization of frequency-selective THz detection makes it possible to obtain near-field THz images in separate frequency bands. With this technology, we perform cryogenic near-field THz-emission imaging without external THz sources, and visualize the spatial distribution of THz radiation associated with electron injection from a source electrode in a semiconductor device. Finally, a graphene-based THz detector with wide-band frequency-tunability is presented, in which the detection mechanism is based on Landau-level formation of Dirac fermions of the graphene. This device is promising as a wide-band near-field THz spectroscopic imager.

  • 新間 秀一, 角倉 早紀, 安田 優太郎, 竹尾 映美, 福崎 英一郎
    原稿種別: 研究紹介
    2016 年 37 巻 12 号 p. 593-598
    発行日: 2016/12/10
    公開日: 2016/12/23
    ジャーナル フリー
    Recent development of matrix-assisted laser desorption/ionization-imaging mass spectrometry (MALDI-IMS) is summarized. Comparing about ten years ago when study of imaging mass spectrometry was started, sample preparation methodology is dramatically improved as well as instruments performance. Our group performs MALDI-IMS under microscope using iMScope TRIO (Shimadzu, Kyoto, Japan). In microscopic MALDI-IMS, special sample preparations are required to improve detection sensitivity and spacial definition. We consider “one-size-fits-all” sample preparation method cannot be available to date, therefore sample preparation methods should be selected for different sample types or target molecules.
  • 青木 弾, 松下 泰幸, 福島 和彦
    原稿種別: 研究紹介
    2016 年 37 巻 12 号 p. 599-603
    発行日: 2016/12/10
    公開日: 2016/12/23
    ジャーナル フリー
    Time-of-flight secondary ion mass spectrometry (TOF-SIMS) has been recognized gradually as a powerful analytical tool for plant materials. The availability of TOF-SIMS measurements in a research field of plant science is briefly introduced. Main polymer components of plant cell wall, cellulose, hemicellulose, and lignin are detected as fragment ions. Inorganics and low molecular-weight extractives are detectable as elemental and molecular ions. In living plant materials, there are various water-soluble organic/inorganic chemicals. There is a strong apprehension that such water-soluble chemicals can be moved by the sample preparation process of trimming, sectioning, and drying. Recently, the author and co-workers have analyzed freeze-fixed plant samples by cryo-TOF-SIMS. The latest topics of cryo-TOF-SIMS dealing with frozen-hydrated samples are introduced.
  • 久我 ゆかり
    原稿種別: 研究紹介
    2016 年 37 巻 12 号 p. 604-609
    発行日: 2016/12/10
    公開日: 2016/12/23
    ジャーナル フリー

    The high sensitivity of secondary ion mass spectrometry (SIMS) allows isotope imaging and the high spatial precision has a potential for the localization of isotopes corresponding to the ultrastructure of cell components. This paper reviews a study in which transfers of carbon and nitrogen from the fungus in a symbiotic orchid protocorm were analyzed, combining an isotope tracer experiment, sample preparation for transmission electron microscopy, and SIMS cellular imaging. The results showed that, 13C and15N transferred from young and senescent hyphae, and in the plant cells, they were localized differently in individual cells and organelles, depending on the colonization status (the presence or absence of fungal structures and the early or late developmental stage of the fungal structure). Stable isotope imaging at the cellular level provides new insights into cellular functions of the endosymbiosis.

    Editor’s picks

  • 武藤 俊介, 志賀 元紀
    原稿種別: 研究紹介
    2016 年 37 巻 12 号 p. 610-615
    発行日: 2016/12/10
    公開日: 2016/12/23
    ジャーナル フリー

    Recent development of digitized and automated measurement systems has inevitably accelerated applications of data mining techniques based on statistical/information processing. In the present article we outlined the recent progress in our chemical imaging techniques based on the statistical analysis of ‘spectral image’ datasets, obtained by a suite of scanning transmission electron microscopy and associated spectroscopy. Finally, we discuss the future prospects of the field to extend the present bilinear model to multi-way analysis for more robust modeling of low signal-to-noise ratio data.

  • 齊藤 結花, 馬越 貴之
    原稿種別: 研究紹介
    2016 年 37 巻 12 号 p. 616-621
    発行日: 2016/12/10
    公開日: 2016/12/23
    ジャーナル フリー

    Using near-field microscope, one can realize optical nano-imaging beyond the diffraction limit of incident light. The characteristic of this microscope is to combine variety of spectroscopic technique e. g. linear and non-linear vibrational spectroscopy, IR absorption, light scattering spectroscopy, fluorescence and photoluminescence. In this article, we will provide the basics of near-field microscope as well as reviewing recent 2-3 yearʼs publications related to this technique.

  • Dae Won MOON
    原稿種別: Current Topic
    2016 年 37 巻 12 号 p. 622-624
    発行日: 2016/12/10
    公開日: 2016/12/23
    ジャーナル フリー

    Briefly summarized are our present activities on how to utilize ion beams for bio imaging. We have been trying to extend the analysis scope of bio-SIMS from lipids and metabolites to proteins to make SIMS an omni-molecular imaging tool. To overcome the sample preparation requirement of mass spectrometry for vacuum compatibility, an ambient imaging mass spectrometer has been developed. A TOF-MEIS system developed for nano thin film interface analysis were used for liquid interface analysis, which can be extended further to cell membrane analysis. Ultimate spatial resolution of 0.5 nm with ion beams is provided by HIM. Complementary multimodal approaches are necessary for better understanding of nano and bio systems.

研究紹介
  • 野村 健太郎
    原稿種別: 研究紹介
    2016 年 37 巻 12 号 p. 625-630
    発行日: 2016/12/10
    公開日: 2016/12/23
    ジャーナル フリー

    Recent developments in the research field of Dirac and Weyl semimetals are reviewed. We introduce Weyl semimetal which has linear energy dispersion and nontrivial topology in the band structure. One of characteristic phenomena is negative magnetoresistance, which stems from three-dimensional linear dispersion. Another characteristic phenomenon is the anomalous Hall effect which occurs in Weyl semimetals with magnetic order. Fermi arc states appear as surface states localized at the boundary. Type II Weyl semimetals are also argued.

連載企画
安全な社会と表面科学
  • 小野 真理子
    2016 年 37 巻 12 号 p. 631-633
    発行日: 2016/12/10
    公開日: 2016/12/23
    ジャーナル フリー

    ナノマテリアルは微小な固体粒子である。粒子を構成する元素等が同じであっても,一次粒子のサイズが数十nmに微小化することによって,材料として新たな機能が発現することや分散性が向上することから生産量が増大している。ナノマテリアルの使用量は今後も増大が見込まれ,労働者の健康を維持するために労働環境におけるナノマテリアルのリスク管理は重要である。本解説では,粉じんの健康影響とリスク管理の考え方,ナノマテリアルエアロアゾルの曝露評価の考え方と曝露対策について簡単に述べる。

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