Coverage-dependent adsorption thermodynamics of oxygen on ZnO(0001)

Research output: Contribution to journalArticle

Abstract

The equilibrium behavior of oxygen adsorbed on metal oxide surfaces such as ZnO(0001) often affects their behavior in applications such as gas sensing. The present work attempts to bridge this distinct gap to applications from an alternate perspective by employing the optical technique of photoreflectance (PR) to measure the enthalpy ΔH ads and entropy ΔS ads of oxygen adsorption as a function of coverage on Zn-terminated ZnO(0001). The large and strongly coverage-dependent parameters, stemming from a multiplicity of sites, chemical species and reconstructions, lead to a nonmonotonic coverage variation in both ΔH ads and ΔS ads . The entropic contribution to the free energy is comparable to the enthalpic contribution even near room temperature, so that temperature effects on oxygen adsorption may be uncommonly large.

Original languageEnglish (US)
Pages (from-to)220-225
Number of pages6
JournalApplied Surface Science
Volume397
DOIs
StatePublished - Mar 1 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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