Overcoming intra-molecular repulsions in PEDTT by sulphate counter-ion
| Autor: | T. Greunz, Niyazi Serdar Sariciftci, Achim Walter Hassel, Dominik Farka, Christoph Cobet, Cezarina Cela Mardare, Markus C. Scharber, Cigdem Yumusak, David Stifter |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
pedtt Materials science Inorganic chemistry Focus on Optical magnetic and electronic device materials 106 Metallic materials pedot 201 Electronics / Semiconductor / TCOs 301 Chemical syntheses / processing chemistry metal–insulator transition TA401-492 General Materials Science 105 Low-Dimension (1D/2D) materials Counterion 203 Magnetics / Spintronics / Superconductors conducting polymers magnetotransport Materials of engineering and construction. Mechanics of materials 500 Characterization TP248.13-248.65 Research Article Biotechnology |
| Zdroj: | Science and Technology of Advanced Materials, Vol 22, Iss 1, Pp 985-997 (2021) Science and Technology of Advanced Materials article-version (VoR) Version of Record |
| ISSN: | 1878-5514 1468-6996 |
| DOI: | 10.1080/14686996.2021.1961311 |
| Popis: | We set out to demonstrate the development of a highly conductive polymer based on poly-(3,4-ethylenedithia thiophene) (PEDTT), PEDOTs structural analogue historically notorious for structural disorder and limited conductivities. The caveat therein was previously described to lie in intra-molecular repulsions. We demonstrate how a tremendous >2600-fold improvement in conductivity and metallic features, such as magnetoconductivity can be achieved. This is achieved through a careful choice of the counter-ion (sulphate) and the use of oxidative chemical vapour deposition (oCVD). It is shown that high structural order on the molecular level was established and the formation of crystallites tens of nanometres in size was achieved. We infer that the sulphate ions therein intercalate between the polymer chains, thus forming densely packed crystals of planar molecules with extended π-systems. Consequently, room-temperature conductivities of above 1000 S cm−1 are achieved, challenging those of conventional PEDOT:PSS. The material is in the critical regime of the metal–insulator transition. GRAPHICAL ABSTRACTS |
| Databáze: | OpenAIRE |
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