High-Performance PEDOT:PSS/Hexamethylene Diisocyanate-Functionalized Graphene Oxide Nanocomposites: Preparation and Properties
Publisher
MDPI
Date
2018Bibliographic citation
Luceño Sánchez, J.A.; Peña Capilla, R.; Díez-Pascual, A.M. High-Performance PEDOT:PSS/Hexamethylene Diisocyanate-Functionalized Graphene Oxide Nanocomposites: Preparation and Properties. Polymers 2018, 10, 1169.
Keywords
PEDOT:PSS
Graphene oxide
Nanocomposite
Hexamethylene diisocyanate
Functionalization degree
Sheet resistance
Optical transmittance
Mechanical properties
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Publisher's version
https://doi.org/10.3390/polym10101169Rights
© 2018 by the authors
Atribución 4.0 Internacional
Access rights
info:eu-repo/semantics/openAccess
Abstract
Graphene oxide (GO) has emerged as an ideal filler to reinforce polymeric matrices owing to
its large specific surface area, transparency, flexibility, and very high mechanical strength. Nonetheless,
functionalization is required to improve its solubility in common solvents and expand its practical
uses. In this work, hexamethylene diisocyanate (HDI)-functionalized GO (HDI-GO) has been used
as filler of a conductive polymer matrix, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)
(PEDOT:PSS). The nanocomposites have been prepared via a simple solution casting method, and
have been characterized by scanning electron microscopy (SEM), UV–Vis and Raman spectroscopies,
X-ray diffraction (XRD), thermogravimetric analysis (TGA), tensile tests, and four-point probe
measurements to get information about how the HDI-GO functionalization degree (FD) and the
HDI-GO concentration in the nanocomposite influence the final properties. SEM analysis showed
a very homogenous dispersion of the HDI-GO nanosheets with the highest FD within the matrix, and
the Raman spectra revealed the existence of very strong HDI-GO-PEDOT:PSS interactions. A gradual
improvement in thermal stability was found with increasing HDI-GO concentration, with only
a small loss in transparency. A reduction in the sheet resistance of PEDOT:PSS was found at low
HDI-GO contents, whilst increasing moderately at the highest loading tested. The nanocomposites
showed a good combination of stiffness, strength, ductility, and toughness. The optimum balance
of properties was attained for samples incorporating 2 and 5 wt % HDI-GO with the highest FD.
These solution-processed nanocomposites show considerably improved performance compared to
conventional PEDOT:PSS nanocomposites filled with raw GO, and are highly suitable for applications
in various fields, including flexible electronics, thermoelectric devices, and solar energy applications.
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