単一分子ワイヤの並列経路の形成による近弾性電子輸送の制御

Albert C Aragonès^1,2, Nadim Darwish³, Simone Ciampi³

¹Department of Chemistry, Faculty of Natural & Mathematical Sciences , King's College London , Britannia House, 7 Trinity Street , London SE1 1DB , United Kingdom.

Journal of the American Chemical Society

|December 6, 2018

まとめ

オリゴフェロセンの単分子ワイヤで高効率のコヒーレントトンネリングが観察されました. 電極への直接結合により電子輸送が強化され,導電性はフェロセンの単位数に依存する.

科学分野:

分子電子
量子トランスポート
ナノテクノロジー

背景:

単一分子電子は,個々の分子を導電成分として利用することを目的としています.
ナノスケールの電子機器の開発には効率的な電荷輸送が不可欠です
導電性を最適化するには,電極-分子インターフェースを理解することが重要です.

研究の目的:

オリゴ・フェロセンの単一分子線でコヒーレントトンネリングを調査する.
導電性に対するフェロセンの直接結合の影響を調査する.
分子ワイヤの長さと電荷輸送効率の関係を決定する.

主な方法:

スキャニング・トンネル顕微鏡 (STM) のブレイク・ジャンクションを用いた単分子ジャンクションの製造.
異なる長さのオリゴフェロセンのワイヤのゼロ電圧バイアスの導電性を測定する.
不均衡のグリーン関数の計算を用いた理論的モデリング.

主要な成果:

フェロセンのユニットと電極の直接結合は,非常に効率的な電子輸送を容易にした.
導電性は,フェロセンの単位を加えることで,導電量に近付いて,大幅に (5倍) 増加した.
導電性は温度に関係なく,輸送メカニズムとして一貫したトンネリングを確認しました.

結論:

直接フェロゼン電極結合は,低トンネルバリアを持つ効率的な分子導管を生成します.
これらの分子ワイヤの伝導性は,フェロセンの単位数によって調整できます.
オリゴ・フェロセンの分子線は弾性電子輸送の可能性を示しています

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