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Characterization of 2D-assembled overlayers based on p-aminophenol on Cu(110)

AutorRuiz del Árbol, Nerea; Palacio, Irene; Otero, Gonzalo ; Martínez, José I. ; Stetsovych, Oleksander; Moro-Lagares, María; Mutombo, Pingo; Švec, Martin ; Jelinek, Pavel; Floreano, Luca; López, María Francisca ; Martín-Gago, José A.
Fecha de publicaciónjun-2016
CitaciónInternational Workshop On-surface Synthesis (2016)
ResumenOn-surface chemistry has emerged as an important research field leading to unconventional self-assembled nanoarchitectures with tunable properties [1,2]. The development of surfacesensitive spectroscopies has provided a powerful set of tools for a detailed characterization of the structure, composition, and physicochemical properties of the molecular structures obtained by this methodology. We have evaporated p-aminophenol (p-AP) on Cu(110) at 493 K and followed a bottom-up azocoupling reaction, leading to dimer formation: 4,4'-azobis(phenol). We have characterized the on-surface synthesized self-assembled structure by different techniques. Thus, by using a combination of STM/AFM, LEED, XPS and NEXAFS as well as DFT calculations, we are able to unveil the structural and chemical characteristics of the process and outcome. The structural analysis reveals that p-AP molecules have coupled forming new molecular species that self-organize on the surface. They lay in a flat geometry preserving the in-plane ¿- conjugated benzene units as depicted by NEXAFS. LEED pattern analysis shows that the molecular layer exhibit a long-range order with a [(5,1),(-1,2)] symmetry, forming chains rotated 20º with respect to the [001] direction of the Cu surface, as deduced by the STM/AFM images. (Fig 1). Finally, the XPS N1s spectra reveal an oxidation reaction from amine to imine while XPS O1s data suggests that oxygen atoms are covalently bound to the substrate. In summary, all the information obtained by following this multitechnique study, allow us to figure out a model of the structure promoted by the catalytic properties of substrate in a thermal activated process.
DescripciónTrabajo presentado en el International Workshop On-surface Synthesis, celebrado en San Sebastián del 27 al 30 de junio de 2016.
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