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非金属Au246から金属Au279への鋭い移行
Tatsuya Higaki1, Meng Zhou1, Kelly J Lambright2
1Department of Chemistry , Carnegie Mellon University , Pittsburgh , Pennsylvania 15213 , United States.
Journal of the American Chemical Society
|April 17, 2018
まとめ
原子的に正確な金ナノクラスター (Au279) は,より小さなクラスターとは異なり,金属の性質を示す. この発見は,金属ナノ粒子のエクシトニック状態からプラズモニック状態への移行に関する新しい洞察を提供します.
科学分野:
- ナノテクノロジー
- 材料科学
- 物理化学
背景:
- 金属ナノ粒子の光学特性には大きな関心があります.
- エクシトン状態からプラズモンの状態への移行を理解することは,金属ナノ粒子の研究にとって極めて重要です.
- 2nm以上の原子精度の高いナノ粒子を 製造することは大きな課題でした
研究 の 目的:
- 原子的に正確な金ナノクラスター (Au279(SR) 84を合成し,特徴づけること.
- 金ナノクラスターにおける非金属から金属の電子構造への移行を調査する.
- Au279ナノクラスターの光学特性と表面プラズモン共鳴 (SPR) 振る舞いを調査する.
主な方法:
- 原子精度の高い Au279 ((SR) 84 ナノクラスターの合成
- 興奮状態のダイナミクスを分析するフェムト秒間吸収スペクトロスコーピー.
- 定常状態の吸収スペクトロスコーピーは,さまざまな温度で光学特性を研究します.
主要な成果:
- Au279ナノクラスターは,金属状態を示し,レーザー電源に依存する興奮状態の寿命を示した.
- これは,より小さなAu246 ((SR)) 80ナノクラスターで観察された非金属電子構造と対照的です.
- Au279ナノクラスターは,プラズモンの行動と一致する60Kまでの有意なピークシフトなしに506nmで新生プラズモンの帯を示した.
結論:
- Au246とAu279のナノクラスターの間に非金属から金属への急激な移行が観察されました.
- Au279ナノクラスターは,プラズモンの振る舞いを含む金属ナノ粒子の特徴を示しています.
- これらの発見は,金属ナノクラスターにおける電子トランジションとプラズモンの形成に関する将来の理論研究のための基礎を提供します.
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