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半導体ナノクリスタル・レドックス・ポテンシャルの電位測定

Gerard M Carroll¹, Carl K Brozek¹, Kimberly H Hartstein¹

¹Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States.

Journal of the American Chemical Society

|March 16, 2016

まとめ

新しい電位測定法により,半導体ナノ結晶 (NC) の酸化還元電位が測定されます. このテクニックは,異なるNCタイプ間の電子移転の研究を可能にする,NC減量レベルをリドックスポテンシャルと相関させます.

科学分野:

材料科学
電気化学
ナノテクノロジー

背景:

半導体ナノ結晶 (NC) は光電子学において極めて重要です.
電子の転移を制御する鍵となるのです
NCリドックスポテンシャルを測定するための既存の方法には限界があります.

研究の目的:

コロイド半導体ナノ結晶 (NC) のリドックスポテンシャルを測定するためのポテンチオメトリクスの開発と検証.
NCリドックスポテンシャルとインサイト測定中の還元レベルを相関させる.
電子伝送のダイナミクスと駆動力を研究する.

主な方法:

NCフェルミレベルを現地で測定するためのポテンチオメトリック技術の開発.
この方法をZnOとCdSeのコロイドナノ結晶に適用する.
電気化学的および光学的なリドックスインジケーター方法による電位測定結果の比較

主要な成果:

フォトドーピングの際に,ポテンチオメトリック法では,コロイド性ZnONCのリドックスポテンシャルを正確に測定します.
潜在測定法と既定の還元指数法との間には優れた一致性が見られた.
コロイドCdSeNCはZnONCよりも負の伝導帯域エッジポテンシャルを示した.
CdSeからZnOのNCへの自発的な電子移転は定量化され,NC間の電子移転の推進力を評価するメソッドの有用性を実証した.

結論:

ポテンチオメトリーは,コロイド半導体ナノ結晶の酸化還元特性を特徴付けるための堅牢な方法を提供します.
この技術は,高度なナノ材料の設計に関連する電子転送プロセスに関する洞察を提供します.
この方法は,光触媒と太陽エネルギー変換などの分野で潜在的応用があります.

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