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Issue 12, 2014
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Substrate steered crystallization of naphthyl end-capped oligothiophenes into nanofibers: the influence of methoxy-functionalization

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Abstract

Naphthyl end-capped oligothiophenes are a class of materials well suited for high-performance organics based devices. The formation of nanofibers on muscovite mica from 2,5-bis(naphth-2-yl)thiophene (NaT), 5,5′-bis(naphth-2-yl)-2,2′-bithiophene (NaT2), and 5,5′′-bis(naphth-2-yl)-2,2′:5′,2′′-terthiophene (NaT3) as well as of the methoxy-functionalized variants MONaT, MONaT2, and MONaT3 is investigated via atomic force microscopy, X-ray diffraction, polarized fluorescence microscopy, and fluorescence spectroscopy. From polarized fluorescence microscopy spatially resolved molecular orientations are deduced revealing a profound anisotropy. Fibers from lying molecules grow along distinct substrate directions. Methoxy-functionalization substantially increases the crystallization into aligned fibers. In air Ostwald ripening is observed. The morphological variations of the aggregates result in specific optical signatures, disclosed by temperature dependent and spatially resolved fluorescence spectra.

Graphical abstract: Substrate steered crystallization of naphthyl end-capped oligothiophenes into nanofibers: the influence of methoxy-functionalization

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Article information


Submitted
12 Sep 2013
Accepted
27 Jan 2014
First published
28 Jan 2014

This article is Open Access

Phys. Chem. Chem. Phys., 2014,16, 5747-5754
Article type
Paper

Substrate steered crystallization of naphthyl end-capped oligothiophenes into nanofibers: the influence of methoxy-functionalization

F. Balzer, M. Schiek, A. Osadnik, I. Wallmann, J. Parisi, H. Rubahn and A. Lützen, Phys. Chem. Chem. Phys., 2014, 16, 5747
DOI: 10.1039/C3CP53881H

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