Low Temperature H2O and NO2 Coadsorption on θ-Al2O3/NiAl(100) ultrathin films
The co-adsorption of H2O and NO2 molecules on a well-ordered, ultrathin ?-Al2O3/NiAl(100) film surface was studied using temperature programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) and X-ray photoelectron spectroscopy (XPS). For H2O and NO2 monolayers adsorbed separately on the ?-Al2O3/NiAl(100) surface, adsorption energies were estimated to be 44.8 kJ/mol and 36.6 kJ/mol, respectively. Coadsorption systems prepared by sequential deposition of NO2 and H2O revealed the existence of coverage and temperature dependent adsorption regimes where H2O molecules and the surface NOx species (NO2/N2O4/NO2-,NO3-) form segregated and/or mixed domains. Influence of the changes in the crystallinity of solid water (amorphous vs. crystalline) on the coadsorption properties of the NO2/H2O/?-Al2O3/NiAl(100) system is also discussed.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 882381
- Report Number(s):
- PNNL-SA-47854; 6694; KC0302010
- Journal Information:
- Journal of Physical Chemistry B, Journal Name: Journal of Physical Chemistry B Journal Issue: 15 Vol. 110
- Country of Publication:
- United States
- Language:
- English
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