Formation of ordered multilayers from polyoxometalates and silver on electrode surfaces

Jongwon Kim, Lien Lee, Brian K. Niece, Jia X. Wang, Andrew A Gewirth

Research output: Contribution to journalArticle

Abstract

We show that multilayers of a common polyoxometalate-silicotungstic anion (STA), α-SiW 12O 40 4--are formed on a Ag electrode surface or other electrode surfaces in the presence of Ag + poised in the cathodic potential region. This effect is not observed on either Au surfaces or C surfaces absent Ag +. Surface X-ray scattering, quartz crystal microbalance, X-ray photoelectron spectroscopy, and scanning tunneling microscopy measurements show that the silicotungstic acid apparently stabilizes the Ag + cation, which electrostatically assembles with the STA anion or the one-electron reduced species to form ordered multilayers. In contrast to other electrostatically assembled multilayer systems, those formed here exhibit considerable order.

Original languageEnglish (US)
Pages (from-to)7927-7933
Number of pages7
JournalJournal of Physical Chemistry B
Volume108
Issue number23
DOIs
StatePublished - Jun 10 2004

ASJC Scopus subject areas

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

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