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ナノメートルの電子スイッチは,金属クラスターと酸化還元対応グループで構成されています
D I Gittins1, D Bethell, D J Schiffrin
1Centre for Nanoscale Science, Department of Chemistry, University of Liverpool, UK.
Nature
|November 18, 2000
まとめ
研究者らは,酸化還元活性有機分子を用いて,金のナノ粒子を電極表面に結合させた. このブレークスルーにより,電子輸送の制御が可能になり,新しいナノスケール電子スイッチの道が開けています.
科学分野:
- ナノテクノロジー ナノテクノロジー
- 分子電子 (モレキュラー・エレクトロニクス)
- マテリアルサイエンス 材料科学
背景:
- ボトムアップ製造方法は,分子規模の電子機器を作成することを目的としていますが,電子輸送を制御することは重要な課題です.
- レドックスセンターを持つ有機分子は,共振トンネリングの有望性を示しているが,複雑なアセンブリに統合することは困難である.
- 機能化された金属ナノ粒子は,単一の電子特性と自己組み立て能力を提供し,ナノスケールの電子機器への興味を惹いています.
研究 の 目的:
- 金属ナノ粒子を電極表面に結合させるための酸化還元活性有機分子の使用を調査する.
- これらの分子結合器を使用して,金属ナノ粒子間の電子輸送の制御を実証する.
- ナノスケールの電子スイッチを開発するためのこのシステムの可能性を調査する.
主な方法:
- スキャントンネル顕微鏡 (STM) を用いて電子伝送を測定した.
- ポリメチレン鎖と中央のビピリジニウム部分で機能した金ナノクラスターを使用しました.
- レドックス活性分子を介してナノ粒子と電極の間の電子接触とトンネリング特性を調査しました.
主要な成果:
- 機能化された有機分子を用いて,金ナノクラスタを電極表面に成功裏に結合した.
- レドックス活性分子がナノ粒子間の電子輸送を制御できることを実証した.
- 分子に電荷を注入すると,トンネリング特性が大幅に変化することが観察されました.
結論:
- レドックス活性有機分子は,金属ナノ粒子を電極表面に効果的に橋渡しすることができます.
- この分子架け橋は,ナノスケールデバイスの機能性における重要な要因である制御された電子輸送を可能にします.
- 開発されたシステムは,分子電荷状態を操作することによって,高度なナノスケール電子スイッチを作成するための基盤を提供します.
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