Fullerene monolayers adsorbed on high index gold single crystal surfaces

Copper underpotential deposition (Cu UPD) and STM studies have been carried out on fullerene (C60) modified Au single crystal surfaces to determine the influence of crystal orientation on the structure of adsorbed C60 overlayers. High coverage could be achieved for C60 on all the surfaces studied, Au(111), Au(332) and Au(554). In each case, hexagonal and/or quasi-hexagonal arrays of adsorbed C60 were formed, with distortion from the ideal hexagonal packing arising from the constrained width of the terraces of the stepped surfaces. The structural parameters of the C60 overlayers were found to be sensitive to the terrace width.