Electrical conductance of single C60 and benzene molecules bridging between Pt electrode

The electrical conductance of single C-60 and benzene molecules bridging between Pt electrodes was investigated at room temperature in ultrahigh vacuum. The conductance of the Pt/C-60/Pt junction was 0.7 G(0)(2e(2)/h), which was close to that of the metal atomic contact. The single C-60 molecular junction showed a high and fixed conductance value, by the direct binding of the C-60 to the Pt electrodes without using anchoring group. The conductance of the Pt/C-60/Pt junction decreased and its stability increased with the amount of deposited C-60 molecule, which could be explained by the C-60 adsorption on the stem part of the electrode. In contrast with the Pt/C-60/Pt junction, the Pt/benzene/Pt junction did not show a fixed conductance value, reflecting the planar molecular shape.