Novel Development of Asymmetry Chemistry in Inorganic Nanocrystals

2021 Fiscal Year Final Research Report

• Project Area: Coordination Asymmetry: Design of Asymmetric Coordination Sphere and Anisotropic Assembly for the Creation of Functional Molecules
• Project/Area Number: 16H06520
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kyoto University
• Principal Investigator: Teranishi Toshiharu 京都大学, 化学研究所, 教授 (50262598)
• Project Period (FY): 2016-06-30 – 2021-03-31
• Keywords: ナノ材料 / アシンメトリー / イオン結晶 / 結晶系変化 / 異方構造

Outline of Final Research Achievements

In this research, we develop a new field of chemistry, asymmetry chemistry, by fabricating the asymmetric structures composed of various inorganic nanocrystals. An anisotropic assembly of near-infrared plasmonic nanocrystals and carrier acceptor nanocrystals was successfully achieved while controlling their band positions. Then we achieved high quantum yield and charge separation lifetime exceeding microseconds in near-infrared light-induced directional charge separation by utilizing trap levels etc. of plasmonic nanocrystals. We also succeeded in synthesizing pseudo-tetrahedral Au nanocrystals planarly coordinated with four porphyrin derivatives, and demonstrated that the electrochemical hydrogen evolution reaction activity is enhanced by the charge transfer from porphyrin to the Au core.

Free Research Field

無機合成化学

Academic Significance and Societal Importance of the Research Achievements

ヘテロ界面やバンド位置を緻密に制御することにより、これまでに得ることができなかった近赤外プラズモニックナノ結晶とキャリアアクセプターナノ結晶を非対称に異方集積化したヘテロ構造ナノ結晶の合成法を開発した。このヘテロ構造体の近赤外光誘起指向性電荷分離における高い量子収率とマイクロ秒を超える長い電荷分離寿命を利用することで、近赤外光を用いた水分解水素生成や光電変換を実証した。