Synthesis of metal-organic framework glasses with high impact resistance and semiconducting properties

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K22200
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 34:Inorganic/coordination chemistry, analytical chemistry, and related fields
• Research Institution: Kyoto University
• Principal Investigator: Horike Satoshi 京都大学, 高等研究院, 准教授 (70552652)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: ガラス / 金属－有機構造体：MOF / 半導体 / 機械的特性

Outline of Final Research Achievements

We have synthesized metal-organic framework (MOF) glasses composed of a metal and a ligand, which are both impact-resistant and electrically conductive. Various electrically conductive MOF crystals were attempted to be vitrified by melt-quenching or milling, and mechanical and electrochemical properties were investigated in combination. It was found that MOFs with cyano-nitrile ligands showed good vitrification, low Young's modulus and hardness. This is suggested to be due to the high degree of freedom in the bonding properties of these ligands. In particular, glasses made from Prussian blue derivatives exhibit electrical conductivities exceeding 10^-4 S/cm at around room temperature, indicating that softness and semiconducting properties coexist in these glasses.

Free Research Field

錯体化学・固体化学

Academic Significance and Societal Importance of the Research Achievements

ガラス材料は身の回りの様々な場面で用いられている。一般的にガラスは脆弱であり割れやすい。また電気伝導性を示すことは限られることが知られている。本研究では、割れにくく、電気伝導性を示すガラスの創出を行った。金属と分子をつなげたMOFと呼ばれる構造を利用した。十分に高い電気伝導性を持つものが見つかったことから、ガラス固有の透明性や均質性を併用し、センサーや電気化学触媒などへの応用が期待される。柔らかい特徴を持つことから、他の物質とのハイブリッド化や、ウェアラブルデバイスへの搭載なども検討できる。