Investigation of Thermoelectric Performance of MoS₂-Templated Polyaniline Nanocomposites

Abstract:

Polyaniline has attracted a lot of attention for thermoelectric (T.E) applications, however their drawback materials is that they possess low power factors than the state-of-the-art materials such as BiTe-based, BiSb-based, PbTe-based, etc. ^[1-4]. Currently, in order to enhance the T.E properties, hybrids between the polymer and other components such as carbon materials, other polymers, and even inorganic materials are being investigated. In this work, the effect of MoS₂ addition on the T.E properties of polyaniline was investigated. The MoS₂ nanoflowers were first synthesized via hydrothermal process at 200 °C for 24 hrs after which they were used for templated in situ polymerization of polyaniline. The scanning electron microscope (SEM) image showed that the MoS₂ nanoflowers were covered with the polyaniline during the polymerization process and this was confirmed from the X-ray diffraction (XRD) analysis which showed existence of both the polyaniline and MoS₂ in the synthesized material. The electrical conductivity of polyaniline was reported to be 10^-3 S cm^-1 and it was noticed that addition of minute amounts of MoS₂ into polyaniline resulted in an enhancement of the electrical conductivities of up to two orders of magnitude. Nanocomposite with 5 % MoS₂ (PMX-5) showed optimized power factor values ranging from 6.30 x 10^-2 - 1.12 x 10^-3 μW m^-1 K^-2 for the temperature range studied. This study therefore provides a facile approach for synthesis of polyaniline-molybdenum disulphide nanocomposites and the results obtained confirm that transition metal dichalcogenides (TMDs) have a potential for the enhancement of T.E properties of polyaniline.

• Periodical: Key Engineering Materials (Volume 821)
• Pages: 103-110
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.821.103
• Online since: September 2019
• Authors: Mariamu K. Ali*, A.A. Moneim
• Keywords: Hydrothermal, In Situ Polymerization, Molybdenum Disulphide (MoS₂), Polyaniline, Thermoelectric

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