シリコン上のキラル金属表面のエピタキシアル電位
Meagan V Kelso1, John Z Tubbesing2, Qingzhi Chen2
1Department of Materials Science and Engineering and Graduate Center for Materials Research , Missouri University of Science and Technology , Rolla , Missouri 65409-1170 , United States.
Journal of the American Chemical Society
|October 27, 2018
まとめ
研究者は,電化学的にシリコンウエーフェルに金を積むことで,触媒と分離のためのキラル表面を作成しました. この方法はエナチオメア表面を生成し,グルコースエナチオメアの選択的酸化を可能にし,高価な単一結晶の使用を避けます.
科学分野:
- 表面科学
- 材料化学
- カタリシス
背景:
- アキラル表面は,面中心立方金属の (643) 表面のように,鏡対称性が欠けている場合,二次元キラリティを示すことができます.
- キラル表面は,非対称合成,キラル分離,結晶化における応用が有望である.
- 以前は,キラル表面を作るには高価な単一結晶が必要でした.
研究 の 目的:
- キラルの表面を作るための対称性の要件を明らかにする.
- 電子沈着を用いたエナティオメリックキラル表面の製造方法の開発.
- 選択的化学プロセスにおけるこれらのキラル表面の有用性を実証する.
主な方法:
- エピタキシアルゴールドフィルムの電気化学的堆積は,商業的に利用可能なシリコン (Si) ウェーファーに (643) 方向性がある.
- 制御された堆積は,ワッフルの反対側のエナティオメールAu ((643) とAu ((6̅4̅3̅) 表面を生成する.
- その後,他の金属 (Pt,Ni,Cu,Ag) を金膜に放電して,オーダーされた多層構造を作り出します.
主要な成果:
- Si ((643)) ウェファーの上にエナティオメリックゴールドの表面,Au ((643) とAu ((6̅4̅3̅) を成功裏に生成した.
- 表面のキラリティも表している.
- これらの金膜に収まった他の金属は 高い構造的秩序を示しています
- 分別,Ag/Au/Si ((643) とAg/Au/Si ((6̅4̅3̅) 表面におけるd-グルコースとl-グルコースのエナチオセレクティブ電気化学的酸化を示した.
結論:
- 電気化学的堆積法では,高価な単一結晶なしで多様なキラル表面を製造するためのスケーラブルな経路を提供します.
- 生成されたキラル表面は,グルコース酸化などのエナチオセレクティブ化学反応のプラットフォームとして機能する.
- このアプローチは,新しいキラル触媒と分離材料の開発の道を開きます.
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