A template-assisted growth of a flat, covering, and single-crystalline IrO 2 (110) film with controlled film thickness is reported that is suitable for use in model catalysis and as model electrodes in electrocatalysis. The template consists of a single-crystalline covering RuO 2 (110) layer grown on Ru(0001). In the first step, we formed IrO 2 seeds on the RuO 2 (110) layer, which then continue to grow by deposition of Ir in an oxygen atmosphere of 3 × 10 –7 mbar at a sample temperature of 700 K. The IrO 2 seeds are prepared by depositing nanometer size metallic Ir particles on RuO 2 (110) (in total 0.3–0.5 monolayer (ML) of Ir) at room temperature. Subsequently, the Ir particles are oxidized in 10 –5 mbar of O 2 at a sample temperature of 700 K. The techniques of scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy, and low-energy electron diffraction (LEED) are employed to characterize the morphology, crystallinity, and electronic structure of the prepared ultrathin IrO 2 (110) films. Thermal desorption spectroscopy, LEED, and STM provide conclusive evidence that the thermal decomposition of IrO 2 (110) films already started at 500 K under ultrahigh vacuum conditions.
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Abb et al. (2018) studied this question.
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