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制御されたアスペクト比と表面修正を持つ超薄金ナノ棒:形成機構と局所化された表面プラズモン共鳴
Ryo Takahata1, Seiji Yamazoe1,2,3, Kiichirou Koyasu1,2
1Department of Chemistry, School of Science , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-0033 , Japan.
Journal of the American Chemical Society
|April 26, 2018
まとめ
超薄金ナノ棒 (AuUNR) を合成しました 調整可能な長さで直径が2nmです これらのナノスケールの金構造は 従来のナノ棒とは異なる独特の光学特性を示した.
科学分野:
- ナノテクノロジー
- 材料科学
- 物理化学
背景:
- 黄金のナノ棒 (AuNR) は近赤外線 (NIR) 領域で局所的な表面プラズモン共鳴 (LSPR) を示し,アスペクト比によって調節することができます.
- 超薄なナノ構造の合成を制御することは 独特の量子閉じ込め効果を 探求するのに不可欠です
- リガンドと表面の相互作用を理解することは,ナノマテリアルの特性を調整する鍵です.
研究 の 目的:
- 制御された寸法 (直径 ~2 nm,長さ 5 ~ 20 nm) の超薄金ナノ棒 (AuUNR) を合成する.
- 時間解像度の高い光学スペクトロスコーピーを用いて,AuUNRの形成メカニズムを調査する.
- AuUNRの光学特性に対するリガンド交換の効果を研究する.
主な方法:
- オレイラミン (OA) を表面活性剤として用いて,黄金の緩やかな還元によるAuUNRの合成.
- トランスミッション電子顕微鏡 (TEM) と光学絶滅スペクトロスコピーを用いた特徴付け.
- グルタチオネートまたはドデカネチオレートを用いたリガンド交換
- 時間解像度の高い光学スペクトロスコーピーは,探査機形成メカニズムを検出する.
主要な成果:
- 調節可能な長さ (5-20 nm) と定直径 (∼2 nm) のAuUNRが成功して合成されました.
- AuUNRsの形成は,OAミセル内のクラスターアセンブリによって起こると考えられている.
- OAからチオラートへのリガンド交換は,AR < 5のNIR帯の青いシフトを誘導し,非プラズモンの起源 (単電子刺激) を示唆しました.
- 化学界面のダッピングにより,チオラート受容がLSPRを弱めた.
- AuUNRは,電子の有効質量増加に起因する,類似の面比の従来のAuNRと比較して,著しく赤にシフトしたLSPR波長を示した.
結論:
- 超薄金ナノ棒は,直径が小さいため,従来の金ナノ棒と比べて異なる光学特性を有しています.
- 低アスペクト比を持つチオラートで保護されたAuUNRで観測されたNIR帯は,プラズモンの現象ではなく,量子効果によるものである可能性が高い.
- ナノノード直径の縮小は光学反応に大きな影響を及ぼし,新しいナノスケール光学アプリケーションの道を開きます.
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