Interaction Control Between Endohedral Metallofullerene and Metal Substrate by Introducing Alkanethiol Self-Assembled Monolayer
The interaction control between endohedral metallofullerenes and a metal substrate has been demonstrated by introducing hexanethiol, octanethiol, and decanethiol self-assembled monolayers (SAMs) as the interlayer. We observe the electric properties of terbium endohedral metallofullerenes ([email protected]82) on alkanethiol SAMs with different chain lengths by scanning tunneling microscopy (STM) and spectroscopy (STS). Based on the comparison of the high-resolution STM images of a [email protected]82 molecule on hexanethiol and octanethiol SAMs, the interaction between [email protected]82 and a hexanethiol SAM is found to be larger than that between [email protected]82 and an octanethiol SAM; this is because at 68 K, the rotational states of [email protected]82 terminate only on the hexanethiol SAM. Furthermore, we find that the tunneling current-voltage characteristics of [email protected]82 on the hexanethiol SAM show the rectifying effects that are also caused by the molecular energy level shifts of [email protected]82 molecules due to the large interaction.
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Document Type: Research Article
Publication date: 2006-11-01
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