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Acidity-Mediated Metal Oxide Heterointerfaces: Roles of Substrates and Surface Modification.

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Summary
This summary is machine-generated.

Surface acidity controls electron behavior in nanostructured oxides. Modulating interfaces with acidic or basic additives tunes conductivity, crucial for functional oxide applications.

Keywords:
electrical conductivitiesheterointerfacesnanostructured functional oxidespraseodymium‐doped ceria nanowire arraysspace charge potentialssurface acidity

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Direct observation of conductivity changes due to interfacial electron modulation by surface acidity is lacking.
  • Understanding local space charge effects is crucial for functional oxides.

Purpose of the Study:

  • To demonstrate tunable electrical properties of nanostructured oxides by controlling interfacial electron concentrations.
  • To investigate the influence of surface acidity on the conductivity of Pr0.2Ce0.8O2-δ nanowire arrays (PCONA).

Main Methods:

  • Fabrication of well-aligned PCONA as a model platform.
  • Infiltration with Li2O to alter surface acidity.
  • Investigating conductivity changes in response to substrate acidity variations.

Main Results:

  • Acidity-modulated heterointerfaces predict electron depletion or accumulation, tuning electrical properties.
  • A three-orders-of-magnitude increase in PCONA conductivity was observed with basic Li2O infiltration.
  • Substrate acidity significantly influences the electronic properties of PCONA.

Conclusions:

  • Surface acidity is a key factor in modulating the conductivity of nanostructured functional oxides.
  • Observed conductivity changes are attributed to acidity-mediated space charge potentials and cation in-diffusion at grain boundaries.
  • Substrate and surface treatments offer a strategy to control conductive properties in nanostructured oxides.