室温 酸化によって誘発された金属-有機枠組における金属伝導性
Andrew J Clough1, Nicholas M Orchanian1, Jonathan M Skelton2
1Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States.
Journal of the American Chemical Society
|September 26, 2019
まとめ
高品質の鉄金属有機フレームワーク (MOF) は,冷却時に半導体から金属へのユニークな移行を示しています. 空気への曝露は 金属の伝導性をさらに高め 先進的な電子機器への道を切り開きます
科学分野:
- 材料科学
- 固体物理学
- 化学について
背景:
- 酸化還元活性リンク器を備えた金属有機フレームワーク (MOF) は,高い電気伝導性により,電子と電気触媒に希望を示しています.
- 多くの2D MOFは金属であると計算的に予測されているが,実験データは冷却時に導電性が低下する半導体行動を示している.
- 導電性が冷却時に増加する金属特性を示すMOFはほとんどなく,導電性の起源に関するさらなる研究が必要である.
研究 の 目的:
- 高結晶性の鉄2,3,6,7,10,11-トリフェイレンヘキサチオラート (THT) MOF,FeTHTの電気伝導性を調査する.
- FeTHTの電子特性に対するゲスト種と空気被曝の影響を理解する.
- 化学抵抗感知と光電子学の応用におけるFeTHTの可能性を調査する.
主な方法:
- 非常に結晶性の高い鉄2,3,6,7,10,11-トリフェイレンヘキサチオラート (FeTHT) MOFを最小限の寄宿種で合成する.
- 電子トランジションを観察するための可変温度伝導度測定.
- FeTHTを空気に照射し,導電性と移行温度への影響を研究する.
主要な成果:
- 高結晶性のFeTHTは,冷却 (100〜300K) 時に複合的な半導体から金属への移行を示します.
- 空気への曝露は,過渡温度を大幅に変化させ,室温以上で金属のような伝導性をもたらします.
- FeTHTはドーピングに対する耐性を示し,充電移転と伝導性の向上につながります.
結論:
- 高結晶度を達成し,ゲスト種を除去することは,MOFの固有の電子特性を観察するために不可欠です.
- 空気への曝露は,FeTHTの電子特性を調節し,金属伝導性を促進する方法である.
- FeTHTの調節可能な金属のような伝導性は,化学抵抗性センサーと光電子装置の有望な候補となります.
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