Novel Functions in Organic-Inorganic Surface Nanostructures

• Project/Area Number: 16K13969
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Functional solid state chemistry
• Research Institution: Gunma University
• Principal Investigator: Fujisawa Jun-ichi 群馬大学, 大学院理工学府, 准教授 (20342842)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: ナノ構造 / 光誘起分子移動 / 無機－有機複合体 / 無機―有機複合体 / 界面ナノ構造 / 機能 / 酸化チタン / 無機-有機ハイブリット / 無機-有機複合材料 / 光機能 / 包接機能

Outline of Final Research Achievements

I have studied surface nanostructures of organic compounds on inorganic semiconductors and their functions using various inorganic semiconductor nanoparticles and organic compounds in a wide range from a strong adsorption regime (chemisorption) to a weak adsorption regime (physisorption). I found that bisphenol derivatives form nanocavity structures on TiO2 surfaces in a strong adsorption regime. The cavity nanostructures feature the photoinduced charge change due to interfacial charge-transfer transitions. In a weak adsorption regime, methylene blue forms H-aggregates on SrTiO3 surfaces due to photoinduced diffusion motion. The photoinduced molecular transfer occurs by one-cycle charge-distribution change in methylene blue due to electronic excitation and relaxation. These results provide new knowledge for the construction of surface nanostructures.

Research Products

• [Journal Article] Facile and Rapid Visualization of Colorless Endocrine Disruptor Bisphenol A by Interfacial Charge-Transfer Transitions with TiO2 Nanoparticles (2017)
  • Author(s): J. Fujisawa, S. Matsumura and M. Hanaya,
  • Journal Title: ChemistrySelect Volume: 2 Issue: 21 Pages: 6097-6099
  • DOI: 10.1002/slct.201700590
  • Peer Reviewed
• [Journal Article] Light Absorption and Photoluminescence due to Interfacial Charge-Transfer Transitions in Aromatic Amine-Functionalized Silicon Nanoparticles (2017)
  • Author(s): J. Fujisawa and M. Hanaya
  • Journal Title: Chem. Phys. Lett. Volume: 684 Pages: 285-289
  • DOI: 10.1016/j.cplett.2017.06.057
  • Peer Reviewed
• [Journal Article] A Surface Nanocavity Structure of Bisphenol P on TiO2 Showing Interfacial Charge-Transfer Absorption (2016)
  • Author(s): J. Fujisawa, S. Matsumura and M. Hanaya
  • Journal Title: ChemistrySelect Volume: 1 Issue: 17 Pages: 5590-5593
  • DOI: 10.1002/slct.201600357
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 界面電荷移動遷移の生体・薬剤分子への応用と界面ナノ構造体への展開 (2017)
  • Author(s): 藤沢 潤一, 江田 匠, 松村 信吾, 菊池 なつみ, 花屋 実
  • Organizer: 第97春季年会
  • Place of Presentation: 慶応大学日吉キャンパス
  • Year and Date: 2017-03-17
• [Presentation] Mechanism of Efficient Photoluminescence in Amine-Functionalized Si Nanoparticles (2017)
  • Author(s): J. Fujisawa, C. Takahashi and M. Hanaya
  • Organizer: 2017年光化学討論会
• [Presentation] 酸化チタンとフェノール誘導体から生成する無機－有機複合物質の光電変換機能 (2017)
  • Author(s): 松村 信吾，藤沢 潤一，花屋 実
  • Organizer: 日本化学会関東支部群馬地区研究交流発表会（2017）
• [Remarks]
  • URL: http://bussei-kagaku.chem-bio.st.gunma-u.ac.jp/index_fujisawa.html