Its position can be seen shifting to lower binding energies as the oxygen content in ruthenium increases and the origin of this shift has been explained in previous work for the case of silica bilayers. The main peak on the O 1s region corresponds to framework oxygen from the MFI structure. The oxidation is most clear when looking at the satellite peak on the Ru 3d region at 282.7 eV, which appears clearly at 350☌ and grows significantly by 550☌. The oxidation of the ruthenium surface is evident from the spectra upon annealing under oxygen pressure.

A photon energy of 750 eV was used in these experiments.

The AP-XPS core level spectra of (A) O 1s and (B) Ru 3d are taken under 1 × 10 − 4 mbar of O 2 with increasing temperatures. Oxidation through MFI nanosheets on the Ru(0001) surface. 74 Previous AP-XPS studies had shown that Ru(0001) starts oxidizing at 350 C at an O 2 pressure of 10 − 4 mbar and readily forms RuO 2(110) at 450☌. four cases were compared (1) bare Ru(0001), (2) Mordenite Framework Inverted (MFI) nanosheets, (3) all-Si 2dH zeolite model, and (4) Al-containing 2dH zeolite model. However, the 2D-zeolite structure plays a very important role, which emphasizes how confinement effects exerted by the 2D-zeolite in this case, can have dramatic consequences in the chemistry. 74, 75 It is mostly the Ru(0001) in this heterostructure that undergoes chemical changes. 73 The first AP-XPS studies on these materials looked at the permeability of small molecules (O 2 and H 2) through these prisms onto the underlying Ru(0001) substrate and reaction upon increasing the temperature. Stacchiola, in Encyclopedia of Interfacial Chemistry, 2018 Chemistry at the Interface Between 2D-Zeolites and Metal SubstratesĪs mentioned before, the 2dH zeolite model system is composed mostly of hexagonal prisms as building blocks with a minority population of other polygonal prisms.

Volume of a hexagonal prism