2014年3月
Additive Electron Pathway and Nonadditive Molecular Conductance by Using a Multipodal Bridging Compound
JOURNAL OF PHYSICAL CHEMISTRY C
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- 巻
- 118
- 号
- 10
- 開始ページ
- 5275
- 終了ページ
- 5283
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/jp4100262
- 出版者・発行元
- AMER CHEMICAL SOC
We designed and synthesized a new quadrivial anchoring unit 4-TEB, to construct a stable single-molecule junction with gold electrodes, which should have equivalent conducting electron pathways between two electrodes. The conductances of single-molecule junctions comprising 4-TEB and its bidirectional counterpart 2-TEB were determined to be 2.7 x 10(-4)G(0) (2e(2)/h) and 5.0 X 10(-5)G(0), respectively, by using scanning tunneling microscope break junction (STM-BJ) techniques. The single 4-TEB molecule junction had higher stability and conductivity compared to those of the single 2-TEB molecule junction. Although the number of electron pathways from/to the electrode to/from the molecule was additive using the equivalent multianchoring the conductance of the single-molecule junction was not additive. From first-principles electronic transport calculations, the mechanism for the new quadrivial 4-TEB single-molecule junction involved an overlap resonance effect to the HOMO conducting orbital, giving rise to tunneling. Using fixed nanogap electrodes, we constructed stable molecular junctions of 4-TEB and observed symmetric peaks in the derivative of the conductance-voltage (G-V) curves, which were assigned to electron transport through the HOMO on the basis of theoretical calculations.
- リンク情報
- ID情報
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- DOI : 10.1021/jp4100262
- ISSN : 1932-7447
- ORCIDのPut Code : 51221037
- Web of Science ID : WOS:000333005700024