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Study of Organic Molecules on Metal Oxides

AuthorsSánchez-Sánchez, Carlos ; Lanzilotto, Valeria; Floreano, Luca; López, María Francisca ; Martín-Gago, José A.
Issue DateSep-2012
CitationFuerzas y Túnel (2012)
AbstractOrganic molecules on surfaces have attracted scientific attention in the last years thanks to their inherent and special properties. Particularly, they are thought to be the ideal candidates to substitute Si in future electronics due to their donor-acceptor character (Molecular Electronics). Up to date, the majority of scientific efforts have been focused on studying their interaction with metal surfaces, which are crucial for fundamental knowledge, but far from ¿real¿ and practical systems. Metal oxides are much more interesting from a technological point of view as they present a non-negligible amount of defects. Among metal oxides, TiO2 is the prototype one for surface science studies as it can be easily prepared under UHV conditions and presents a well-ordered surface. In this work, we have studied the interaction of different organic molecules, C60, pentacene and C60H30, with the rutile TiO2 (110)-(1x1) surface. All three molecules diffuse on the surface at room temperature. However, they present different behaviours with coverage and temperature. C60 molecules diffuse until a critical coverage of 0.3 ML is reached. At this point, they tend to form well-ordered close-packed structures with (5x2) symmetry (Fig. 1 a)) [1]. Pentacene presents a similar behaviour, with molecules diffusing until a critical coverage of 0.5 ML is reached. Once this coverage is reached, they form ordered structures whose periodicity depends on coverage. Saturation symmetry is (6x1) (Fig. 1 b)) [2]. On the contrary, C60H30 diffuses on the surface even for coverage close to a complete monolayer. However, a molecular transformation takes place after annealing the system at 375K. At this temperature, molecules are stabilized on the surface thanks to the appearance of stronger interactions due to partial dehydrogenation of the molecules (Fig. 1 c)).
DescriptionTrabajo presentado en Fuerzas y Túnel, celebrada en San Lorenzo de El Escorial del 12 al 14 de septiembre de 2012.
Appears in Collections:(ICMS) Comunicaciones congresos
(ICMM) Comunicaciones congresos
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