Interfacially ordered C-60 films on Cu(111) substrates

C-60(111) films are grown on Cu(111)/mica and Cu(111)/Ag(111)/mica substrates, and their structures are studied by x-ray diffraction. For growth temperatures ranging from 130 to 240 degrees C, well-ordered C-60(111) overlayers form in doubling-positioning (twinned) in-plane structures. These in-plane structures are oriented such that their <[2(2)over bar 0]> directions are parallel (in-phase), and rotated 30.0 degrees relative to close-packed directions of their Cu(111) substrates. The rotated structures grow depending on the kinetics of the growth process, as well as the surface structural properties of the copper substrates. (C) 1996 American Institute of Physics.