液体細胞伝送電子顕微鏡を用いた個々のAuスパイキーナノ粒子の成長動態
Wan-Gil Jung1, Jeung Hun Park2,3, Yong-Ryun Jo1
1School of Materials Science and Engineering , Gwangju Institute of Science and Technology (GIST) , 123 Cheomdangwagi-ro, Buk-gu , Gwangju , Korea.
Journal of the American Chemical Society
|July 11, 2019
まとめ
研究者らは,液体細胞伝達電子顕微鏡を用いて,金色の尖ったナノ粒子 (SNP) の成長を観察した. この研究は,添加物なしで金SNPのサイズ,形状,および表面プラズモン共鳴 (SPR) を制御するための新しい方法を示しています.
科学分野:
- ナノテクノロジー
- 材料科学
- 物理化学
背景:
- 調節可能な表面プラズモンの共鳴 (SPR) において,黄金の尖ったナノ粒子 (Au SNP) のサイズと形状を正確に制御することが重要です.
- Au SNPの成長メカニズムと形態学的移行を理解するには,ナノメートルの解像度でリアルタイムで観察する必要があります.
- 現在の合成方法は,多くの場合,精密な制御を制限する還元剤またはキャピング剤に依存しています.
研究 の 目的:
- 液体細胞伝達電子顕微鏡 (LCTEM) を使用して,AU SNPsのインシット成長機構と形態学的移行を調査する.
- 化学的添加物なしで,サイズ,形態,SPR,密度を含むAu SNP特性を操作する方法を確立する.
- 粒子の進化と表面プラズモンの共鳴特性との相関性を調べる
主な方法:
- 液体細胞伝達電子顕微鏡 (LCTEM) を利用して,単一および複数のAu SNPの増殖を観察した.
- 観測中に電子ビームのパラメータ (サイズ,用量) とHAuCl4溶液濃度が変化した.
- 理論モデルと組み合わせた定量分析を行い,成長体制と移行期間を決定した.
主要な成果:
- 観察されたAU SNPの進化は,異なる成長段階を経て,反応制限と黄金形成制限の成長が続いた.
- UV-VISのプラズモン帯の変化と相関する 面状から荒らされた表面への移行を特定しました
- 移行時間 (tc) は粒子密度によって調節可能であり,これはDLVO理論に基づく実験パラメータによって調節される.
結論:
- 制御されたサイズ,形態,SPR,および密度のAu SNPを合成するための新しい方法を開発した.
- 電子ビームと前駆体濃度を調整することで,AU SNPの特性を操作する能力を示し,減少剤やキャピング剤の必要性を回避しました.
- リアルタイムでのLCTEM観測を通じて,Au SNPの成長動態と形態学的進化に関する基本的な洞察を提供しました.
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