高導電性π結合の分子結合は,金電極に共振結合して金電極に結合する

Wenbo Chen¹, Jonathan R Widawsky, Héctor Vázquez

¹Department of Chemistry, Columbia University, New York, New York 10027, USA.

Journal of the American Chemical Society

|September 24, 2011

まとめ

研究者は,金電極で直接の共電結合を形成することによって,単一の結合分子で高伝導性を達成しました. 分子電子学のこの突破は,将来の電子機器のための有望な経路を提供します.

科学分野:

分子電子 (モレキュラー・エレクトロニクス)
ナノテクノロジーナノテクノロジー
凝縮物質物理学凝縮物質物理学

背景:

分子の金属電極への直接的共電結合は,効率的な電荷輸送に不可欠である.
以前の研究は,しばしば,より弱い物理吸収またはより少ない導電性結合に依存していました.

研究の目的:

直接の金-炭素共電結合を持つ単一の結合分子における電子伝導性を調査する.
分子構造が導電性と伝導機構に与える影響を調査する.

主な方法:

スキャニング・トンネル顕微鏡 (STM) ベースのブレイク・ジャンクション・テクニックを使用します.
トリメチルチンの末端グループを持つ分子を合成して,in situ cleavageとAu-C結合形成を行う.
計算分析のための密度関数理論 (DFT) を採用する.

主要な成果:

1,4-ジメチレンベンゼンの1量子 (G(0) に近い伝導性を達成した.
メチレン関連オリゴフェニルとアミン関連オリゴフェニルの導電性が100倍増加した.
より長いオリゴマーの伝導機構としてトンネリングが実証され,長さの指数関数依存性がある.

結論:

直接のAu-C共電結合は,単一分子結合における電子結合と伝導性を大幅に強化する.
分子設計,特に結合した背骨とメチレンリンクナーの使用は,分子導電性を最適化するための鍵です.
発見は,新しい分子電子部品の開発への道を開く.

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