Using Scanning Tunneling Microscopy (STM) to monitor the surface morphology and High Resolution Electron Energy Loss Spectrometry (HREELS) to measure the vibrational spectrum, we have systematically investigated the relationship between the surface morphology and charge transfer from Cu(111) to C60. Since at 300 K, C60 is mobile on the Cu(111) terrace, but is more strongly bound at the step edge, any C60 which adsorbs on the terrace will migrate to the step edge where it is immobilized. Because of this, at very low coverages, the C60 preferentially adsorbs at the step edge. The amount of charge transfer from the substrate to the C60 can be determined by measuring the amount of frequency shift of the T1u (IR active) modes. For C60 adsorbed on the terrace, we determined a transfer of approximately 1.6 electrons/C60 molecule. No additional frequency shift of the vibrational modes was seen for C60 adsorbed at the step edge, indicating that any additional charge transfer at the step edge is small-less than one electron/C60 molecule.
|Journal||Journal of the Korean Physical Society|
|Issue number||SUPPL. PART 1|
|Publication status||Published - 1997|
ASJC Scopus subject areas
- Physics and Astronomy(all)