VBLセミナー・講習会 (2012年度)

平成24年度 第5回VBLセミナー

• 日時：平成24年12月5日（金）16時30分〜18時
• 場所：名古屋大学VBL4F セミナー室

• 16:30〜
• 講師： N. Sokolov (VBL招聘研究員, ヨッフェ物理工学研究所研究グループ長/教授(ロシア))?
• 題目： “LASER MOLECULAR BEAM EPITAXY:GROWTH OF METALS AND OXIDES”

• 17:00〜
• 講師： S. Suturin (VBL招聘研究員, ヨッフェ物理工学研究所 シニア研究員(ロシア))?
• 題目： “A look inside epitaxial cobalt (nickel) nanoparticleswith a 3D reciprocal space imagingcarried out by GIXD, RHEED and GISAXS”

• 17:30〜
• 講師： L. Pasquali (VBL招聘研究員, モデナ/ レッジオ エミリア大学 助教(イタリア))
• 題目： “Dichroic Soft X-ray reflectivity as a tool to study ultrathin anisotropic organic layers”

• 問い合わせ先：

名古屋大学 シンクロトロン光研究センター

田渕 雅夫

Tel: 052-789- 5430

E-mail: m.tabuchi nusr.nagoya-u.ac.jp

 

平成24年度 第4回VBLセミナー

• 日時：平成24年11月16日（金）16時〜17時30分
• 場所：工学部3号館　322講義室
• 講師：Prof. Cheol Jin Lee （ VBL招聘研究員, 高麗大学教授）
• 題目：Electrial Properties and Electronic Devices Based on Low Dimensional Nanomaterials

• 問い合わせ先：

名古屋大学 大学院工学研究科 量子工学専攻

齋藤弥八

Tel: 052-789-4459, Fax: 052-789-3703

E-mail:ysaitosurf.nuqe.nagoya-u.ac.jp

 

平成24年度 第3回VBLセミナー

• 日時：平成24年9月6日（木）15時〜16時30分
• 場所：名古屋大学VBL4階セミナー室
• 講師：Prof. F. Boscherini （ VBL招聘研究員, ボローニャ大学/准教授(イタリア)）
• 題目： Local structure of dilute and concentrated nitride semiconductors and hydrogenation effects

• 要旨： A review will be made of recent applications of X-ray absorption fine structure (XAFS) and related techniques to the study of the local atomic and electronic structure of dilute and concentrated nitride seiconductors, with special emphasis on the identification of the defects induced by low energy hydrogen irradiation.?? I will make a brief introduction to the XAFS technique with synchrotron radiation, illustrating the basic physical mechanism, the measurement method and how information on the local structural properties of materials is obtained.?? Dilute nitrides of the type GaAs_1-xN_x (x ~ 1%) exhibit a range of interesting and useful physical properties, including an unexpected red shift of the band gap caused by N incorporation. The red shift can be reversibly eliminated by exposure to low energy hydrogen beams. By using N K-edge XAFS aided by DFT and full multiple scattering structural and spectral simulations we have been able to determine that the defect responsible for the band gap variation consists in two H atoms linked to a N one in a quasi C2v symmetry geometry [1?3]. Complementary to our XAFS investigations (which probe the conduction band DOS), we have very recently used X-ray Emission Spectroscopy (XES) to probe the changes in the valence band DOS induced by hydrogenation by analyzing the lineshape of the valence ? to ? N 1s transitions. The XES results show that the opening of the band gap induced by H is locally due to an upward shift of the conduction band minimum while the position of the valence band maximum is unaffected.?? Concentrated nitrides such as In_xGa_1-xN alloys are attracting considerable interest since the band gap spans a wide spectral range as a function of x. Also in this case, hydrogen irradiation causes an increase in the band gap. We will present and discuss high quality N edge XANES spectra of pristine InxGa1- xN alloys and atom ? specific spectral simulations which illustrate the link between local structural distortions and the XAFS lineshape. Also in this case, the effects of hydrogenation have been studied by a combination of XAFS and DFT simulations of candidate defective structures.

  　

• 問い合わせ先：

名古屋大学 シンクロトロン光研究センター

田渕 雅夫

Tel: 052-789- 5430

E-mail: m.tabuchi nusr.nagoya-u.ac.jp

 

平成24年度 第2回VBLセミナー

• 日時：平成24年7月31日（火）16時〜17時30分
• 場所：名古屋大学フロンティアプラザ（VBL）3階ミーティングルーム
• 講師：Prof. Wei Zhou （VBL 招聘研究員）上海大学化学系
• 題目：Ionic liquids: electrochemical basics and metal deposition study
• 要旨： Ionic liquids as liquid salts have attracted much interests, especially in electrochemistry. As novel alternatives to conventional electrolyte solvent, ionic liquids give electrochemists numerous possibilities of new applications and devices. Herein, the electrode/ionic liquids interface has been studied by differential capacitance measurements, which proves that the ionic liquids present special characteristics at the electrode interface comparing with aqueous solution. Electrodeposition of magnesium, which could not be accomplished in aqueous solution, has been realized by the employment of ionic liquids.

• 問い合わせ先：

名古屋大学大学院理学研究科

物質理学専攻化学系

大内幸雄

Tel: 052-789-2485, Fax: 052-789-2944

E-mail: ohuchichem.nagoya-u.ac.jp

平成24年度 第1回VBLセミナー

• 日時： 平成２４年７月１１日（水） 13：00 〜14：30

• 場所： 名古屋大学工学研究科1号館3階 131講義室

• 講師： Prof. Chaskar Manohar Ganpat　（VBL招聘研究員）　Baburaoji Gholap大教授

• 題目： Synthesis of fine calcium titanate particles by flux method and their photocatalytic performances for hydrogen production

• 要旨： Fine calcium titanate particles were synthesized by the flux method: The fine particles were obtained by heating a mixture of solutes (calcium carbonate and titanium oxide) in flux such as NaCl at high temperature such as 1100 0C, holding this temperature for a long time such as 10 h, and then cooling gradually or rapidly. Several samples were synthesized by using this method in various condition with different ratio of the solutes in the flux (5, 10, 15, 20 mol% of solutes in the NaCl flux), and characterized by DR-UV-VIS, XRD, SEM and BET measurements. As a result, some samples with fine particles were successfully obtained. These samples were loaded with Pt-cocatalyst by the photodeposition method and examined for the photocatalytic tests for hydrogen production. In this seminar, the correlation among the synthesis condition, the structure of the photocatalysts and the photocatalytic activity will be presented and discussed.

• 問い合わせ先：

  名古屋大学大学院工学研究科

  化学・生物工学専攻応用

  吉田寿雄

  Tel:052-789-4609、Fax:052-789-3178

  E-mail: yoshidahapchem.nagoya-u.ac.jp