Conductance Modulation in Tetraaniline Monolayers by HCl-Doping and by Field-Enhanced Dissociation of H2O
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- 作者：William E. Ford ; Deqing Gao ; Frank Scholz ; Gabriele Nelles ; Florian von Wrochem
- 刊名：ACS Nano
- 出版年：2013
- 出版时间：March 26, 2013
- 年：2013
- 卷：7
- 期：3
- 页码：1943-1951
- 全文大小：588K
- 年卷期：v.7,no.3(March 26, 2013)
- ISSN：1936-086X
文摘
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鈥搗oltage 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.