Structural and surface design of inorganic nanoblocks programmed with autonomous nano-array functions

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K19026
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
• Research Institution: Osaka University
• Principal Investigator: Sekino Tohru 大阪大学, 産業科学研究所, 教授 (20226658)
• Co-Investigator(Kenkyū-buntansha): 趙 成訓 大阪大学, 産業科学研究所, 助教 (50776135) ; 後藤 知代 大阪大学, 高等共創研究院, 准教授 (60643682)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Keywords: 無機ナノブロック / ナノキューブ / 無機-有機ハイブリッド / チタン酸バリウム / リガンド交換 / 分子修飾 / 親水疎水制御 / 自律的配列機能

Outline of Final Research Achievements

Barium titanate nanocubes (BTNCs) were synthesized by hydrothermal method and molecular modification with various functional groups and ligand exchange protocols were established. Hydrophobic properties were confirmed for as-synthesized BTNCs and MDB-modified BTNCs that had CH3 end-groups, while hydrophilic BTNCs were obtained in both cases when K+ or H+ was added at the end-groups by ligand exchange substitution.
The optical band gap was lower than that of BT (around 3.2 eV), 2.1 eV for MDB-modification, and PDB- and DHBA-modified BTNCs had multiple absorption edges around 2 eV and 3.2 eV, the former considered to be due to interfacial charge transfer from the organic molecules to the BT. In summary, we have obtained the basis for the creation of new nanomaterials with nanoscale morphological specificity which have function as for building blocks.

Free Research Field

セラミックス材料学、ナノ材料工学

Academic Significance and Societal Importance of the Research Achievements

均一形状のナノ構造体（ナノブロック：ナノキューブ・多面体等）をビルディングブロックとし、自律的に多彩な連結、集合構造を形成する機能を持つナノ材料を創発することを目的とした研究を実施し、サイズの揃ったBTNCsを得ると共に、リガンド交換法を用いる事で多彩な有機分子で修飾させる基礎を得た。この結果、修飾有機分子との相互作用により物理化学的・光学的性質を制御できること、有機分子同士の化学反応（縮合反応等）により、NCs自体を連結させる機能を付与させる「自律的ナノ構造化プログラム機能」を持つ材料創製の基礎を得ることができた。