Conductance Modulation in Tetraaniline Monolayers by HCl-Doping and by Field-Enhanced Dissociation of H2O

Oligoanilines are interesting candidates for organic electronics, as their conductivity can be varied by several orders of magnitude upon protonic doping. Here we demonstrate that tetraaniline self-assembled monolayers exhibit an unprecedented conductance on/off ratio of ∼710 (at +1 V) upon doping o...

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Bibliographic Details
Published inACS nano Vol. 7; no. 3; pp. 1943 - 1951
Main Authors Ford, William E, Gao, Deqing, Scholz, Frank, Nelles, Gabriele, von Wrochem, Florian
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 26.03.2013
Subjects
Wien effect
oligoaniline
protonic doping
self-assembled monolayer
molecular switch
dithiocarbamate
dynamic doping
Hg-drop technique
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Summary:Oligoanilines are interesting candidates for organic electronics, as their conductivity can be varied by several orders of magnitude upon protonic doping. Here we demonstrate that tetraaniline self-assembled monolayers exhibit an unprecedented conductance on/off ratio of ∼710 (at +1 V) upon doping of the layers from the emeraldine base to the emeraldine salt form. Furthermore, a pronounced asymmetry in the current–voltage characteristics indicates dynamic doping of the tetraaniline layer by protons generated through field-enhanced dissociation of water molecules, a phenomenon known as the second Wien effect. These results point toward oligoanilines as promising substitutes for polyaniline layers in next-generation thin film devices.
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ISSN:1936-0851
1936-086X
DOI:10.1021/nn3050769