Charge Transfer of C_<60> on Copper Surfaces(STM-C_<60>)

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Using Scanning Tunneling Microscopy (STM) to monitor the surface morphology, and High Resolution Electron Energy Loss Spectroscopy (HREELS) to measure the vibrational spectrum, we have systematically investigated the relationship between the surface morphology and charge transfer from Cu(111) and Cu(110) to C_<60>. Since at 300K, C_<60> is mobile on the Cu(111) terrace, but is more strongly bound at the step edge, any C_<60> which adsorbs on the terrace will migrate to the step edge where it is immobilized. Because of this, at very low coverages, the C_<60> preferentially adsorbs at the step edge. The amount of charge transfer from the substrate to the C_<60> can be determined by measuring the amount of shift of the T_<lu> (IR active) modes. For C_<60> adsorbed on the terrace, we determined a transfer of approximately 1.6 electrons/C_<60> molecule. No additional frequency shift of the vibrational modes was seen for C_<60> adsorbed at the step edge, indicating that any additional charge transfer at the step edge is small -- less than one electron/C_<60> molecule. In contrast, on Cu(110) C_<60> is not mobile on the terrace, but forms well ordered islands upon annealing. C_<60> molecules with three different levels of brightness were observed in the STM images, indicating that C_<60> with different charge states were present on the surface. The HREELS spectrum confirmed this since the single peak observed at 66 meV in the multilayer film split into one shifted and one unshifted component upon annealing to remove the multilayer.scanning tunneling microscopyelectron energy loss spectroscopyfullerene moleculescopper surfacescharge transfer
東北大学の論文
1997-03-28

Charge Transfer of C_<60> on Copper Surfaces(STM-C_<60>)

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