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Issue 30, 2007
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Unimolecular rectification of monolayers of CH3C(O)S–C14H28Q+–3CNQ and CH3C(O)S–C16H32Q+–3CNQ organized by self-assembly, Langmuir–Blodgett, and Langmuir–Schaefer techniques

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Abstract

The advantage of “self-assembly” (strong covalent binding to substrates) was combined with the advantage of Langmuir–Blodgett (LB) or Langmuir–Schaefer (LS) transfer to a solid substrate (quantitative transfer of monolayers to the substrate). The electrical rectification (asymmetric conduction) by a monolayer of thioacetylalkylquinolinium tricyanoquinodimethanide was critically compared when these molecules had been transferred, by such competing techniques, onto gold electrodes, and then covered by a “cold gold” pad electrode. Unimolecular rectification was observed in the expected directions in the LB and LS monolayers. The Self-Assembled Monolayers (SAMs) were disordered; macroscopic measurements of rectification were unsuccessful for the SAMs, but successful for the down-stroke LB and LS monolayers, whose orientation and potential bonding to the Au surface should be identical to that of an ideal SAM.

Graphical abstract: Unimolecular rectification of monolayers of CH3C(O)S–C14H28Q+–3CNQ− and CH3C(O)S–C16H32Q+–3CNQ− organized by self-assembly, Langmuir–Blodgett, and Langmuir–Schaefer techniques

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Publication details

The article was received on 04 Jan 2007, accepted on 14 May 2007 and first published on 12 Jun 2007


Article type: Paper
DOI: 10.1039/B700074J
Phys. Chem. Chem. Phys., 2007,9, 4007-4017

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    Unimolecular rectification of monolayers of CH3C(O)S–C14H28Q+–3CNQ and CH3C(O)S–C16H32Q+–3CNQ organized by self-assembly, Langmuir–Blodgett, and Langmuir–Schaefer techniques

    A. Jaiswal, D. Rajagopal, M. V. Lakshmikantham, M. P. Cava and R. M. Metzger, Phys. Chem. Chem. Phys., 2007, 9, 4007
    DOI: 10.1039/B700074J

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