{"id":1991,"date":"2013-12-16T11:11:42","date_gmt":"2013-12-16T09:11:42","guid":{"rendered":"http:\/\/www.icmm.csic.es\/esisna\/?page_id=1991"},"modified":"2013-12-16T11:11:42","modified_gmt":"2013-12-16T09:11:42","slug":"1991-2","status":"publish","type":"page","link":"https:\/\/wp.icmm.csic.es\/esisna\/1991-2\/","title":{"rendered":"Chemistry and dehydrogenation of C60H30 molecules on TiO2(110) surfaces"},"content":{"rendered":"

We evidence temperature-assisted (cyclo)dehydrogenation reactions of large polycyclic aromatic hydrocarbons (PAHs) for the paradigmatic case of C60<\/sub>H30<\/sub>, and the subsequent bottom-up formation of assembled nanostructures, such as nanodomes, on a dielectric substrate like the TiO2<\/sub>(110) surface. To this aim we have deposited, under ultra-high vacuum environment, submonolayer coverage of C60<\/sub>H30<\/sub>, and we have studied, by a combination of experimental techniques (STM, XPS and NEXAFS) and theoretical methods, the different chemical on-surface interaction stages induced by the increasing temperature. We show that, at room temperature, adsorbed molecules exhibit a weak interaction and freely diffuse on the surface. Nevertheless, a slight annealing induces a transition from this starting (meta)stable configuration towards strongly chemisorbed molecules, in which the perylene aromatics interact with the surface deforming the molecular structure and, as a consequence, surface diffusion is quenched. Higher annealing temperatures lead to partial dehydrogenation, in which the molecule loses some of the peripheral hydrogen atoms and the LUMO level spreads out, manifesting a net total energy gain. Further annealing, up to around 750K, ends ups into complete dehydrogenation. At these temperatures the fully dehydrogenated molecules link between them in a bottom-up coupling, forming nanodomes or fullerene-like monodisperse species. This work opens the door to the use of on-surface chemistry to generate new bottom-up tailored structures directly on high-K dielectric surfaces.<\/p>\n

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Full text in this link: Chemistry and Temperature-assisted Dehydrogenation of C60<\/sub>H30<\/sub> Molecules on Ti02<\/sub>(110) surfaces, <\/strong><\/a>C. S\u00e1nchez-S\u00e1nchez, J. I. Mart\u00ednez, V. Lanzilotto, G. Biddau, B. G\u00f3mez-Lor, R. P\u00e9rez, L. Floreano, M. F. L\u00f3pez y J. A. Mart\u00edn-Gago;<\/strong> Nanoscale, 5<\/strong> (2013) 11058.<\/p>\n

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We evidence temperature-assisted (cyclo)dehydrogenation reactions of large polycyclic aromatic hydrocarbons (PAHs) for the paradigmatic case of C60H30, and the subsequent bottom-up formation of assembled nanostructures, such as nanodomes, on a dielectric substrate like the TiO2(110) surface. To this aim we have deposited, under ultra-high vacuum environment, submonolayer coverage of C60H30,\u2026<\/p>\n

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