直接電気化学的方法を使用して合成されたAuPtナノ粒子の実験的および理論的構造調査
Aliya S Lapp, Zhiyao Duan, Nicholas Marcella1
1Department of Materials Science and Chemical Engineering , Stony Brook University , Stony Brook , New York 11794 , United States.
Journal of the American Chemical Society
|May 12, 2018
まとめ
黄金のナノ粒子にヒドリド末端の電極沈着は,期待されるコア-シェルの配置ではなく,ランダムな合金構造を生成します. これはナノスケールの物質の性質が 質量特性の違いを示しています
科学分野:
- ナノ材料科学
- 電気化学
- 表面科学
背景:
- ハイドリッド末端 (HT) の電解は,散発金 (Au) の表面に単一のプラチナ (Pt) モノレイヤを生成する.
- この方法は,PtCl4(2-) 溶液と,多層の堆積を防ぐため,水素原子のキャピング層を含みます.
研究 の 目的:
- 黄金ナノ粒子 (AuNPs) へのHT電解によって準備された二金属金・プラチナ (AuPt) ナノ材料の構造を調査する.
- ナノスケール構造の形成を 確立された量相堆積行動と比較する.
主な方法:
- 固定された約1.6nmのAuNPで利用されたHT電極置換.
- 電気化学的方法,電子顕微鏡,X線吸収光譜,理論的計算 (DFTとMD) を組み合わせて構造を決定した.
主要な成果:
- 準ランダムなAuPt合金ナノ粒子の形成を観察した.
- これは,散発したAu表面で見られる,明確に定義された,分離されたAu/Pt構造と対比する.
- ナノ粒子に対する予想されたコア・シェル構造に挑戦した.
結論:
- AuNPにHT電位埋着は,コアシェルではなく合金構造を生成することを実証しました.
- マクロ材料とナノ材料の相性における重要な違いを強調した.
- 材料の性質を理解するためにナノスケール構造の決定の重要性を強調した.
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