Scanning Tunneling Microscopy and Infrared Spectroscopy as Combined In- Situ Probes of Electrochemical Adlayer Structure: Cyanide on PT(111)

Abstract

The spatial structure of irreversibly adsorbed cyanide adlayers on a Pt(111) electrode is deduced by means of in-situ scanning tunneling microscopy (STM) combined with infrared reflection-absorption spectroscopy (IRAS). The latter data suggests atop-like Pt-CN coordination. The STM images display a (2 sq rt of 3 x 2 sq rt of 3)R30 deg-7CN structure, with cyanides bound in symmetric atop sites surrounded by hexagonal clusters of CN, likely bound in near-atop sites. This arrangement, stable over the applied potential range -0.5 to 0 V vs SCE, gives way to a (2 x 2) structure and disordered adlayers at lower potentials. These findings are compared with previous structural information deduced from ex-situ electron diffraction.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1994
Accession Number
ADA276715

Entities

People

  • Christopher Stuhlmann
  • Ignacio Villegas
  • Michael J. Weaver

Organizations

  • Purdue University

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Adsorbates
  • Aqueous Solutions
  • Chemistry
  • Diffraction
  • Electrochemical Cells
  • Electrodes
  • Electron Diffraction
  • Electron Energy
  • Electrons
  • Frequency
  • Frequency Shift
  • Infrared Spectra
  • Infrared Spectroscopy
  • Measurement
  • Microscopy
  • Spectra
  • Spectroscopy

Fields of Study

  • Physics

Readers

  • Electrochemical Surface Science
  • Materials Science and Engineering.
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene