Coverage-dependent adsorption thermodynamics of oxygen on ZnO(0001)
Source abstract
Abstract
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 Δ H ads and entropy Δ S 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 Δ H ads and Δ S 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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: ZnO doping and properties · Gas Sensing Nanomaterials and Sensors · Electronic and Structural Properties of Oxides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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