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Fullerene-Based Anchoring Groups for Molecular Electronics

2008; American Chemical Society; Volume: 130; Issue: 40 Linguagem: Inglês

10.1021/ja804699a

1943-2984

Christian A. Martin, Dapeng Ding, Jakob Kryger Sørensen, Thomas Bjørnholm, J. M. van Ruitenbeek, Herre S. J. van der Zant,

Force Microscopy Techniques and Applications

We present results on a new fullerene-based anchoring group for molecular electronics. Using lithographic mechanically controllable break junctions in vacuum we have determined the conductance and stability of single-molecule junctions of 1,4-bis(fullero[c]pyrrolidin-1-yl)benzene. The compound can be self-assembled from solution and has a low-bias conductance of 3 x 10(-4) G0. Compared to 1,4-benzenedithiol the fullerene-anchored molecule exhibits a considerably lower conductance spread. In addition, the signature of the new compound in histograms is more significant than that of 1,4-benzenediamine, probably owing to a more stable adsorption motif. Statistical analyses of the breaking of the junctions confirm the stability of the fullerene-gold bond.