Abstract
Molecular electronics is receiving increased attention because of the unique properties of molecules. And phenacenes are popular candidates for this technology. In this thesis, we focus on the properties of 9-phenacene and Br2-picene. Here we study the adsorption of 9-phenacene on a Ag(111) surface. Different coverages ranging from sub-monolayer to nano-crystals are observed with low temperature scanning tunneling microscope (STM) in UHV, each are also correlated with their electronic states.Furthermore, the sub-monolayer adsorption of Br2-picene on Ag(111) is investigated. Four self-assembly configurations are observed and can be tuned by temperature. Their electronic states are also measured by point scanning tunneling spectroscopy (STS). For molecular electronics, the bottom-up construction of parts is also an approach. Therefore the polymerization and hetero-coupling reaction of molecules had been realized on several kinds of molecules. By evaporating molecules onto the surface and further annealing, we succeeded in the hetero-coupling of Br2-picene and 1,3,5-tris bromo phenyl benzene (TBPB) on Au(111).