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Download fileLangmuir–Scheaffer Technique as a Method for Controlled Alignment of 1D Materials
journal contribution
posted on 2020-04-16, 20:13 authored by Michal Bodik, Ondrej Maxian, Jakub Hagara, Peter Nadazdy, Matej Jergel, Eva Majkova, Peter SiffalovicA widely applicable method for aligning
1D materials, and in particular
carbon nanotubes (CNTs), independent of their preparation would be
very useful as the growth methods for these materials are substance-specific.
Langmuir–Schaefer (LS) deposition could be such an approach
for alignment, as it aligns a large number of 1D materials independently
of the desired substrate. However, the mechanism and required conditions
for alignment of 1D nanomaterials in a Langmuir trough are still unclear.
Here we show, relying on numerical simulations of the Langmuir film
compression, that the LS method is a powerful tool to achieve maximal
alignment of 1D material in a controllable manner. In particular,
1D materials terminated with a suitable surfactant can align only
if the velocity induced by the attraction between individual 1D entities
is low enough relative to the flow speed. To validate this model,
we achieved an efficient LS alignment of single-walled carbon nanotubes
covered with a suitable surfactant relying on the numerical simulations. In situ polarized Raman microspectroscopy during the compression
of Langmuir film revealed good quantitative agreement between the
numerical simulations and the experiment. This suggests the applicability
of the LS technique as a versatile method for the controlled alignment
of 1D materials.
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1 D nanomaterialsLangmuir film compressionsimulation1 D materialsingle-walled carbon nanotubesLangmuir filmCNTLS alignment1 D materialsLS techniquecarbon nanotubesaligning 1 D materialsRaman microspectroscopyLS methodControlled Alignmentflow speed1 D entities1 D MaterialsLangmuir troughgrowth methods