EUV-Driven Carbonaceous Film Deposition and Its Photo-oxidation on a TiO2 Film Surface
| Autor: | Thomas B. Lucatorto, Nadir S. Faradzhev, John T. Yates, Shannon B. Hill, Monica McEntee |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Alkane Carbonaceous film Anthracene chemistry.chemical_element Polycyclic aromatic hydrocarbon Phenanthrene Photochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound General Energy chemistry Physical and Theoretical Chemistry Thin film Carbon Layer (electronics) |
| Zdroj: | The Journal of Physical Chemistry C. 117:23072-23081 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | We report the photodeposition of a carbonaceous layer grown on a TiO2 thin film by extreme ultraviolet (EUV)-induced chemistry of adsorbed n-tetradecane and the subsequent photo-oxidation of this film. Chemical analysis of the carbonaceous layer indicates that irradiation by 92 eV photons converts a fraction of the 14-carbon-atom alkane into two polycyclic aromatic hydrocarbon (PAH) molecules, anthracene and phenanthrene, both also containing 14 carbon atoms. Under continuing irradiation, EUV-induced dehydrogenation and cross-linking of PAHs and precursor alkane fragments form a complex network of carbon bonds with the inferred structure of an sp2-carbon rich film. Exposure of the carbonaceous film to five oxygen-containing molecules has little or no effect in the dark at 300 K. However, in the presence of EUV photons, the ability of the molecules to etch the carbonaceous film increases significantly. Their relative photo-oxidation activity follows the trend H2O2 ≈ O3 > NO ≈ O2 > H2O. The rate of the phot... |
| Databáze: | OpenAIRE |
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