Domini simil-grafene alla superficie di sistemi ossidici: sintesi in situ e caratterizzazione

The uniqueness of high surface area 2D carbon structure and graphene-like materials, as such or supported on metal oxides, make them ideal templates to facilitate the nucleation, growth or interaction of a large variety of structures, thus combining properties from the inorganic and organic world. These systems could be of potential interest in photocatalysis or photovoltaic applications. Among them, a few layer molybdenum disulphide supported on metal oxides, having structural and morphological compatibility with graphene, can be suitable candidate for growing, in a bottom-up approach graphene like domains. This has been made by interaction of gas phase acetylene on MoS_{2} /P25, which allows under mild conditions to grow in situ species having conjugated double bonds, aliphatic and/or aromatic in nature. By means of the bottom up approach, size and morphology of the obtained systems can be carefully tailored by adopting suitable process conditions. In this work, we made some efforts to prepare and characterize these systems, by probing their surfaces and by following the acetylene polymerization reaction by means of FTIR spectroscopy. The use of UV-visible, Raman, HRTEM combined techniques allows us to investigate also the structure and morphology of the obtained systems beside the surface properties. The thesis is organized as follows: Section 1 introduces the carbon-metal oxides and the carbon-metal chalcogenides composites, which are the object of this thesis project, to underline the reasons of their promising applications in several fields. Section 2 deals with the adopted experimental methods of synthesis and characterization. Section 3 shows the obtained results together a detailed discussion. Section 4 shows the conclusions, underlining the potentialities of hybrid materials that combine the organic and inorganic properties. Appendix describes preliminary results concerning the use of titanate nanotubes as new support instead of titania, with the aim of improving the observed properties.