Electrochemical potential dependence of an ultrafast nonequilibrium electron dynamics at Au(111) electrode/aqueous solution interfaces modified with alkanethiols

Research output: Contribution to journalArticlepeer-review

Abstract

Femtosecond transient reflectivity measurements were performed for Au(111) electrode/aqueous solution interfaces under electrochemical potential control. Electrode interfaces modified with and without a self-assembled monolayer of alkanethiols were studied in aqueous solutions of HClO4 and H2SO4. Dependence on electrochemical potential, interface modification, and kind of solute anions are observed concerning the transient reflectivity response in 3ps. For Au electrodes in an aqueous HClO4 solution, the rate of the initial relaxation at an unmodified interface, 6-10 ps-1, decreased with the electrochemical potential at the potential range where a water dipole rearranged. The rate for alkanethiol-modified interfaces showed a tendency depending on the hydrocarbon chain length. A relative deposited energy from absorbed photon energy was estimated, indicating that interface modification with alkanethiols restricted energy dissipation from the interface. Our trial could contribute not only to develop a study of interaction between a substrate and adsorbed molecules in an ultrafast time scale but also to elucidate elementally processes of electrochemical reactions such as oxidation/reduction reactions at an electrode interface.

Original languageEnglish
Pages (from-to)4740-4745
Number of pages6
JournalJournal of Physical Chemistry B
Volume106
Issue number18
DOIs
Publication statusPublished - May 9 2002

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Electrochemical potential dependence of an ultrafast nonequilibrium electron dynamics at Au(111) electrode/aqueous solution interfaces modified with alkanethiols'. Together they form a unique fingerprint.

Cite this