Simple Formation of C₆₀ and C₆₀-Ferrocene Conjugated Monolayers Anchored onto Silicon Oxide with Five Carboxylic Acids and Their Transistor Applications

C 60 and C 60 -ferrocene conjugated molecule bearing five carboxylic acids successfully anchor onto a silicon oxide surface as a monolayer through a simple method of simply dipping an amino-terminated surface into the solution of the C 60 derivatives. The monolayer structure was characterized by UV−vis spectroscopy, X-ray reflectivity, X-ray photoelectron spectroscopy, and IR spectroscopy to reveal that the molecules are standing presenting its C 60 spherical face at the surface. The electronic effect of the C 60 monolayer and the ferrocene-functionalized C 60 monolayer in OFET devices was investigated. When an n -type OFET was fabricated on the ferrocene functionalized monolayer, we see an enhancement in the mobility. When a p -type OFET was made the ferrocene-functionalized C 60 monolayer showed a lowering of the carrier mobility.