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Controlling the Functional Properties of Oligothiophene Crystalline Nano/Microfibers via Tailoring of the Self-Assembling Molecular Precursors
Istituto per la Sintesi Organica e Fotoreattivita' (ISOF), Consiglio Nazionale delle Ricerche.
Istituto per la Sintesi Organica e Fotoreattivita' (ISOF), Consiglio Nazionale delle Ricerche.
Istituto per la Sintesi Organica e Fotoreattivita' (ISOF), Consiglio Nazionale delle Ricerche.
Institute for Microelectronics and Microsystems (CNR-IMM).
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2018 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 28, no 32, article id 1801946Article in journal (Refereed) Published
Abstract [en]

Oligothiophenes are π-conjugated semiconducting and fluorescent molecules whose self-assembly properties are widely investigated for application in organic electronics, optoelectronics, biophotonics, and sensing. Here an approach to the preparation of crystalline oligothiophene nano/microfibers is reported based on the use of a “sulfur overrich” quaterthiophene building block, T4S4 , containing in its covalent network all the information needed to promote the directional, π–π stacking-driven, self-assembly of Y-T4S4-Y oligomers into fibers with hierarchical supramolecular arrangement from nano- to microscale. It is shown that when Y varies from unsubstituted thiophene to thiophene substituted with electron-withdrawing groups, a wide redistribution of the molecular electronic charge takes place without substantially affecting the aggregation modalities of the oligomer. In this way, a structurally comparable series of fibers is obtained having progressively varying optical properties, redox potentials, photoconductivity, and type of prevailing charge carriers (from p- to n-type). With the aid of density functional theory (DFT) calculations, combined with powder X-ray diffraction data, a model accounting for the growth of the fibers from molecular to nano- and microscale is proposed

Place, publisher, year, edition, pages
John Wiley & Sons, 2018. Vol. 28, no 32, article id 1801946
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Experimental Physics
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URN: urn:nbn:se:ltu:diva-70450DOI: 10.1002/adfm.201801946ISI: 000440810500016Scopus ID: 2-s2.0-85051138900OAI: oai:DiVA.org:ltu-70450DiVA, id: diva2:1239473
Note

Validerad;2018;Nivå 2;2018-08-16 (andbra)

Available from: 2018-08-16 Created: 2018-08-16 Last updated: 2018-08-23Bibliographically approved

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Mazzaro, Raffaello

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