On the Hopping Efficiency of Nanoparticles in the Electron Transfer across Self‐Assembled Monolayers

Feng Liu, Kamran Khan, Jing‐Hong Liang, Jia‐Wei Yan, De‐Yin Wu, Bing‐Wei Mao, Palle Skovhus Jensen, Jingdong Zhang, Jens Ulstrup

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Redox reactions of solvated molecular species at gold‐electrode surfaces modified by electrochemically inactive self‐assembled molecular monolayers (SAMs) are found to be activated by introducing Au nanoparticles (NPs) covalently bound to the SAM to form a reactive Au–alkanedithiol–NP–molecule hybrid entity. The NP appears to relay long‐range electron transfer (ET) so that the rate of the redox reaction may be as efficient as directly on a bare Au electrode, even though the ET distance is increased by several nanometers. In this study, we have employed a fast redox reaction of surface‐confined 6‐(ferrocenyl) hexanethiol molecules and NPs of Au, Pt and Pd to address the dependence of the rate of ET through the hybrid on the particular NP metal. Cyclic voltammograms show an increasing difference in the peak‐to‐peak separation for NPs in the order Au
Original languageEnglish
JournalChemPhysChem
Volume14
Issue number5
Pages (from-to)952-957
ISSN1439-4235
DOIs
Publication statusPublished - 2013

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