Design and Characterization of Novel Systems for Molecular Nanoscale Self-Assembly
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概要
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We describe a new molecular engineering approach based on self-assembled monolayers (SAM) that has the potential of fine structure tunability in molecular diodes from isolated molecular wires to two dimensional (2D) aggregates; this approach should be useful for studying dimensionality transition in molecular diodes. Using this technique, we have fabricated a variety of molecular diodes with structure tunability of two-component solid-state mixtures. These are molecular wires (1,4-methane-benzene-dithiol; Me-BDT) and molecular insulator spacers (1-pentanethiol; PT). SAM-based two-terminal devices were prepared at various concentration ratios ($r$) of wires/spacers, sandwiched between two gold electrodes. The transport properties of molecular diodes at low $r$ values ($r < 10^{-3}$) are dominated by the isolated molecular wires dispersed in the dielectric spacer matrix; we conclude that these are one-dimensional (1D)-type devices. At high $r$ values ($r > 10^{-3}$), aggregates of molecular wires are formed in the PT matrix that show additional in-plane order; we conjecture that these are 2D-type devices.
- 2008-02-25
著者
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Vardeny Zeev
Department of Physics, University of Utah, Salt Lake City, UT 84112, U.S.A.
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Burtman Vladimir
Department of Physics, University of Utah, Salt Lake City, UT 84112, U.S.A.