An iodine-modified Au(111) surface, (I/Au(111)), was used as a substrate to prepare a C60 adlayer by self-organization in a benzene solution. A highly ordered C60 adlayer was successfully prepared due to the moderate C60-I/Au(111) interaction. Two lattice structures, (2√3 × 2√3)R30° and p(2 × 2), were imaged for this C60 adlayer. For the first structure, a featureless ball-like molecular shape was imaged, ascribed to the molecular rotation resulting from a symmetrical location between C60 and iodine atoms. For p(2 × 2) structure, the asymmetrical location of C60 with respect to the iodine atoms freezes the C60 molecules on the substrate, leading to a clear image of intramolecular structure. The intermediate iodine atoms in the C60/I/Au(111) adlayer can be desorbed by electrochemically reduction without significantly affecting the ordering of the C60 adlayer. However, the internal pattern of C60 disappears in the absence of iodine.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Surfaces and Interfaces