Properties of an electrochemically deposited Pb monolayer on Cu(111)

Yong S. Chu, Ian K. Robinson, Andrew A. Gewirth

Research output: Contribution to journalArticle

Abstract

The structure of the electrochemically deposited Pb monolayer on Cu(111) in 0.1M HCIO4 was studied using in situ surface x-ray diffraction. The Pb monolayer forms an unrotated incommensurate hexagonal structure. The nearest-neighbor spacing of the Pb monolayer compresses continuously from 1.4% to 3.2% of the bulk spacing as the electrode potential is varied, with no apparent tendency to lock in. The measured isothermal two-dimensional (2D) compressibility of the Pb monolayer, 0.95±0.07 Å2/eV, is in good agreement with the value expected from the 2D free-electron gas model. The surface normal structure of the Pb monolayer on Cu( 111) was studied using reflectivity measurements. Fitting analysis based on a layered model revealed a contracted Pb-Cu spacing and an expanded topmost Cu layer. Unlike the in-plane structure, the surface normal structure showed little potential dependence.

Original languageEnglish (US)
Pages (from-to)7945-7954
Number of pages10
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number12
DOIs
StatePublished - Jan 1 1997

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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