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Single gold atom containing oligo(phenylene)ethynylene: Assembly into LB films and electrical characterization

AuthorsBallesteros, Luz M.; Martín, Santiago; Low, Paul J.; Cea, Pilar
Issue Date2014
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry C 119(1): 784-793 (2014)
AbstractMonomolecular films of an oligo(phenylene)ethynylene, OPE, derivative [2-isocyano-1,3-dimethylbenzene][4-(4′-aminophenylethynyl)phenylethynyl]gold, 1, containing a gold atom in the molecule backbone have been prepared by the Langmuir-Blodgett (LB) method in order to study how the electrical properties can be modulated in monolayers of OPEs by incorporation of a gold center in their structures. UV-vis reflection spectra of Langmuir monolayers of 1 at the air-water interface reveal strong aurophilic interactions between neighboring molecules that increase upon compression. Monolayer Langmuir-Blodgett (LB) films were readily fabricated by the transfer of Langmuir films of 1 onto solid substrates. Quartz crystal microbalance (QCM) experiments conclusively demonstrate formation of monolayer LB films with a high surface coverage. The morphology of these films was analyzed by atomic force microscopy (AFM), revealing formation of homogeneous layers with an optimum surface pressure of transference of 6 mN·m-1. Film homogeneity and integrity was confirmed by cyclic voltammetry, with efficient blocking of gold electrodes by these well-formed monolayers of 1. The electrical properties of LB films of 1 were investigated by scanning tunneling microscopy (STM) using a tip-to-contact method. Characteristic shape for a tunneling junction (Simmons type behavior) I-V curves were observed, with analysis of the pseudolinear (ohmic) region giving a conductance value G = 3.9 × 10-5 G0, which is relatively high for an OPE derivative and may indicate a beneficial role of metal atom incorporation within the wire-like system. © 2014 American Chemical Society.
Descriptionet al.
Publisher version (URL)http://dx.doi.org/10.1021/jp510078w
Identifiersdoi: 10.1021/jp510078w
issn: 1932-7447
e-issn: 1932-7455
Appears in Collections:(ICMA) Artículos
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