Epitaxial growth of a palladium layer on an Au(100) electrode

Hideo Naohara, Shen Ye, Kohei Uosaki

Research output: Contribution to journalConference articlepeer-review

54 Citations (Scopus)

Abstract

The electrochemical deposition process of palladium from a PdCl42- complex on an Au(100) substrate was investigated using in situ scanning tunneling microscopy (STM). The reactant, i.e. the PdCl42- complex, was found to adsorb on the Au(100) surface with an ordered structure in the potential region where neither a cathodic nor an anodic current flowed. The electrochemical deposition of palladium on the Au(100) proceeded at potentials more negative than 1.0 V. The electrodeposition of the first palladium layer started not only on the terrace but also on gold islands which were formed as a result of the lifting process of the reconstructed Au(100) surface and then proceeded two-dimensionally. The following palladium layer was found to grow mainly from the deposited palladium region on top of the gold islands. The shape of the gold island could be identified even after four palladium layers were deposited. The bulk and surface structures of the deposited palladium layer were characterized by X-ray diffraction (XRD) and the copper underpotential deposition (upd) reaction, respectively, and the formation of the Pd(100) phase with a (1×1) surface structure was confirmed.

Original languageEnglish
Pages (from-to)2-9
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume473
Issue number1
DOIs
Publication statusPublished - 1999 Sep 8
Externally publishedYes
EventProceedings of the 1998 International Symposium on Electrochemistry of Ordered Interfaces - Sapporo, Jpn
Duration: 1998 Sep 111998 Sep 12

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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