Interactions of Pt single atoms with the vitreous silica surface; Adsorption and thermal accommodation

S. M. Levine, Steve Garofalini

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The interaction of platinum single atoms with a pristine vitreous silica substrate was investigated using a molecular dynamics computer simulation technique. The simulation involved a combination of a modified Born-Mayer-Huggins potential and a simple Lennard-Jones (12-6) potential. The parameters used were those established previously for applicability to this system. The Pt adatoms were deposited on substrates held at various temperatures (300-1500 K) as well as on a substrate with artificially immobilized atoms. This allowed a direct evaluation of the thermal accommodation process and its temperature dependence, as well as the overall effect of substrate relaxations on the behavior of the Pt adatoms. The simulations showed rapid thermal accommodation of the Pt adatoms on the 300 K substrates, whereas this effect was lessened considerably on the heated (1500 K) substrates. The inefficient accommodation of the hotter substrate resulted in penetration of the Pt into the subsurface region of the film. In those runs where the substrate atoms were held immobilized, the behavior of the Pt adatoms was significantly different.

Original languageEnglish
Pages (from-to)157-168
Number of pages12
JournalSurface Science
Volume177
Issue number1
DOIs
Publication statusPublished - Nov 2 1986

    Fingerprint

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this