TRANSPORT PROPERTIES OF C60 MONOLAYERS GROWN ON NANOSTRUCTURED Au ULTRA-FINE FILMS

Abstract

The Au ultra-fine films were grown by MBE or magnetron sputtering on Al 2 O 3 or MgO single crystals which were annealed at 1000°C to obtain smooth surfaces with a step-terrace structure. A one-dimensional alignment of Au particles was partially observed around the steps on Al 2 O 3(0001), [Formula: see text] surfaces at about 600°C. On the other hand, Au ultra-fine films were also deposited by magnetron sputtering on MgO (100). The two processes were proceeded to obtain C 60 monolayers on the above Au films. Only C 60 molecules adsorbed on Au remained and the others were re-evaporated by annealing at 350°C. By this re-evaporation method the nanostructured C 60 monolayers were fabricated. In addition self-assembly monolayers of a C 60 derivative, C 60- O - C 8 SH , ( C 60-SAM) were synthesized on the Au/MgO by soaking in benzene solution of the C 60 derivative. The C 60-SAM was obtained only along the step edges. In the case of C 60-SAM on ultra-fine Au films/ MgO several samples showed the resistivity anomalies at 150–250 K accompanying with specific deviation from metallic linear dependences on temperature.