Authors: H. Yamamoto, N. Iwata and Y. Shimizu
Affilation: Nihon University, College of Science & Technology, Japan
Pages: 441 - 444
Keywords: C60, self-assembly-monolayer, nano-structure, resistivity anomaly
Exotic electric conducting properties have been expected in organic molecules/metals interfaces with lowdimensional nano-structures. A self-assembly monolayer of a C60 derivative, C60-O-C8SH, (C60-SAM) was synthesized on ultrathin Au films which were deposited on MgO (100) single crystal substrates. Since the surfaces of annealed MgO were atomically flat and revealed stepterrace structures, the ultrathin Au films were deposited along the edges of the steps with the length of a few micrometer. As the result of the characteristic nano-structure of the Au films, the C60-SAM adsorbed on them showed also one-dimensional alignments with the width of few tens nm. The surface morphology of the C60-SAM/Au was observed and analyzed by AFM. In particular samples the resistivity deviated from a normal linear dependence on temperature and revealed an anomalous decrease in the temperature range of 150 - 250K.