DIRECT OBSERVATION OF C-60 LB FILM WITH SCANNING TUNNELING MICROSCOPY

We report the direct imaging of monolayer LB film of C60. The LB film was prepared onto an Au (100) surface by the vertical dipping method for scanning tunneling microscopy (STM) measurements. Ordered arrays of C60 molecules and close-packed molecular aggregation in the film are shown on the STM images. The calculated diameters along two mutually perpendicular directions in the arrays are 0.635+/-0.013 and 0.572+/-0.024 nm, respectively. Our results demonstrate that the molecular shape of C60 is easily compressed into an ellipsoid while forming the LB film.