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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
Published on: October 27, 2018
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ナノラミネートされたMAXフェーズとMXENを合成するために,ルイス酸性溶解塩との反応による元素置換アプローチ
1Engineering Laboratory of Advanced Energy Materials , Ningbo Institute of Industrial Technology, Chinese Academy of Sciences , Ningbo , Zhejiang 315201 , China.
Journal of the American Chemical Society
|March 2, 2019
まとめ
研究者は,新しい Zn ベースの MAX フェーズと Cl 末端の MXenes を置換反応を用いて合成する新しい方法を開発した. このアプローチは,これらの高度なナノラミネート材料を生産するための,より環境にやさしい,HFフリーな経路を提供します.
科学分野:
- 材料科学
- ナノテクノロジー
- 無機化学
背景:
- MAXフェーズやMXenesなどのナノラミネート材料は,多様な用途に不可欠なユニークな性質を備えています.
- MAXフェーズとMXenesの伝統的な合成方法は,しばしば高温とフッ素酸 (HF) のような苛酷な化学物質を含みます.
研究 の 目的:
- 新しいZnベースのMAXフェーズと独占的にCl末端のMXenesのための一般的で効率的な合成アプローチを開発する.
- 熱力学的に不安定なMAXフェーズを合成するための新しい経路と,MXene生産のための緑の方法を探求する.
主な方法:
- MAX相前駆体と溶けた亜鉛塩化物 (ZnCl2) の間の置換反応を含む上から下への合成戦略.
- 溶けたZnCl2をMAX相前駆体 (Ti3AlC2,Ti2AlC,Ti2AlN,V2AlC) のAlを代用して,Znベースの新しいMAX相を形成した.
- 余剰ZnCl2を用いた合成されたZnベースのMAX相の後の剥離により,Cl末端のMXenesが得られる.
主要な成果:
- Ti3ZnC2,Ti2ZnC,Ti2ZnN,V2ZnCという4つの新しいZnベースのMAXフェーズを成功裏に合成した.
- 剥離によって初めてCl末端のMXenes (Ti3C2Cl2,Ti2CCl2) を分離した.
- 脱皮プロセスにおける溶けたZnCl2のルイス酸性の有効性を実証した.
結論:
- 開発された代替反応方法は,高温で熱力学的に安定していないものを含め,新しいMAX相を合成するための汎用的な経路を提供します.
- この研究は,従来の方法の限界を克服して,Cl-terminated MXenesのみを生産するための,グリーンな,HFフリーな化学的アプローチを提示しています.
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