Electron Transport Across the Alkanethiol Self-assembled Monolayer/Au(111) Interface:  Role of the Chemical Anchor

Electron Transport Across the Alkanethiol Self-assembled Monolayer/Au(111) Interface:  Role of the Chemical Anchor

Alkanethiol self-assembled monolayers (SAMs) on Au(111) are model systems for molecular electronics. We probe the role of the chemisorption bond on electron dynamics at the SAM/Au interface using time-resolved two-photon photoemission. Formation of the Au−S bond is evidenced by a localized σ* resona...

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Veröffentlicht in:The journal of physical chemistry. B 2005-11, Vol.109 (46), p.21492-21495
Hauptverfasser: Lindstrom, C. D, Muntwiler, M, Zhu, X.-Y
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container_title The journal of physical chemistry. B
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creator Lindstrom, C. D
Muntwiler, M
Zhu, X.-Y
description Alkanethiol self-assembled monolayers (SAMs) on Au(111) are model systems for molecular electronics. We probe the role of the chemisorption bond on electron dynamics at the SAM/Au interface using time-resolved two-photon photoemission. Formation of the Au−S bond is evidenced by a localized σ* resonance, which broadens and shifts upward in energy when the lying-down chemisorbed molecules stand up. The localized chemisorption bond does not affect the electronic coupling between delocalized image resonances and the metal substrate. Instead, lifetimes of image resonances are decreased due to scattering with S atoms within the thiol or thiolate monolayer.
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title Electron Transport Across the Alkanethiol Self-assembled Monolayer/Au(111) Interface:  Role of the Chemical Anchor
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