Structural characterization of α,ω-DH6T monolayer films grown at the liquid–liquid interface

Abstract

The molecular self-organization of α,ω-dihexylsexithiophene (α,ω-DH6T) monolayers prepared at the solvent–water interface is investigated by complementary microscopy techniques. Our study focuses on the influence of solvents and initial droplet volume on the resulting film morphology. Long-range extended domains in the monolayer regime are detected by visible light microscopy only for toluene. Small-area electron diffraction (SAED) proves the formation of single-crystalline monolayers with structural parameters identical to the organic bulk crystals. In comparison with conventional vacuum sublimated thin films a deviant molecular orientation, derived from near-edge-X-ray absorption fine structure (NEXAFS) in combination with a lower step height measured by atomic-force-microscopy (AFM), indicates a different behaviour of the flexible terminal hexyl chains during growth in a liquid surrounding. Furthermore, a structural degradation over time is observed which is caused by residual solvent molecules that are incorporated during the transfer procedure.

Graphical abstract: Structural characterization of α,ω-DH6T monolayer films grown at the liquid–liquid interface

Supplementary files

Article information

Article type
Paper
Submitted
21 Jul 2021
Accepted
26 Sep 2021
First published
04 Oct 2021

Soft Matter, 2021, Advance Article

Structural characterization of α,ω-DH6T monolayer films grown at the liquid–liquid interface

M. Johnson, T. Hawly, M. Wu, E. Spiecker and R. H. Fink, Soft Matter, 2021, Advance Article , DOI: 10.1039/D1SM01072G

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