Synthesis-dependent surface acidity and structure of SrTiO3 nanoparticles

Federico A. Rabuffetti, Peter C. Stair, Kenneth R. Poeppelmeier

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Chemisorption of pyridine and atmospheric CO2 followed by means of visible Raman and DRIFT spectroscopy were employed to investigate the surface acidity and structure of as-prepared SrTiO3 (STO) samples synthesized using three different approaches, solid-state reaction, molten salt, and sol-precipitation-hydrothermal treatment. Samples prepared via solid-state reaction consisted of irregularly shaped polycrystalline grains with a BET surface area of ∼2 m2/g, whereas those obtained via molten salt synthesis and sol-precipitation-hydrothermal treatment were single-crystalline nanocubes with the {100} faces primarily exposed and BET surface areas of ∼10 and 20 m2/g, respectively. Pyridine and atmospheric CO 2 chemisorption demonstrated that the differences in surface acidity between samples synthesized using different approaches are rather slight with a mixture of SrO-based and TiO-based terminations observed in all cases. In contrast, the typology of surface carbonate species arising from the reactive adsorption of atmospheric CO2 varied significantly between samples, indicating the atomic structure of STO surfaces depends strongly on the synthetic method employed. The presence of coordinatively unsaturated Ti 4+ acid centers and highly nucleophilic O2- anions is particularly relevant in the perspective of employing morphology-controlled perovskite nanoparticles as supports in catalytic applications such as the oxidation of hydrocarbons.

Original languageEnglish
Pages (from-to)11056-11067
Number of pages12
JournalJournal of Physical Chemistry C
Volume114
Issue number25
DOIs
Publication statusPublished - Jul 1 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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