Applications of polyaniline doubly doped with p-toluene sulphonic acid and dichloroacetic acid as microwave absorbing and shielding materials

Sook Wai Phang, Tetsuo Hino, M. H. Abdullah, Noriyuki Kuramoto

    Research output: Contribution to journalArticle

    76 Citations (Scopus)

    Abstract

    Doped-polyanilines (PAnis) were prepared at 0 °C using different synthesized parameters such as different ratio of dopants like p-toluene sulphonic acid (pTSA) and dichloroacetic acid (DCA), oxidant (ammonium peroxydisulfate, APS) and various kind of solvents (H2O, HCl aqueous and H3PO4 aqueous). The doped-PAnis were then characterized by UV-vis, FTIR and thermogravimetric analysis. Generally, it is important to control the synthesized parameters to get the expected value of dielectric constants and conductivities in order to improve the microwave behavior of PAnis. Microwave behaviors of PAnis were studied using a microwave vector network analyser from 0.3 GHz to 13.5 GHz. Sample E with Ani/pTSA/DCA ratio of 1/1/1 and synthesized in H2O with APS ratio of 1 posses most efficient doping during polymerization, thus it has a maximum conductivity of 9.86 S cm-1. This sample has a lower dielectric loss (ε{lunate} r = 5.1) and negative dielectric constant (ε{lunate} r = -15.2), thus leading to more disordered movement of charge carriers along the backbone of polymer. Consequently, this sample exhibited better microwave property since only 1.07-4.90% of the microwave energy was being transmitted in frequency range of 4-13.5 GHz. In conclusion, this sample is a good microwave shielding and absorbing materials at higher frequency.

    Original languageEnglish
    Pages (from-to)327-335
    Number of pages9
    JournalMaterials Chemistry and Physics
    Volume104
    Issue number2-3
    DOIs
    Publication statusPublished - 15 Aug 2007

    Fingerprint

    Dichloroacetic Acid
    Dichloroacetic acid
    sulfonic acid
    Polyaniline
    Shielding
    Toluene
    shielding
    toluene
    Microwaves
    microwaves
    acids
    Acids
    Permittivity
    Doping (additives)
    permittivity
    conductivity
    Dielectric losses
    Charge carriers
    Oxidants
    dielectric loss

    Keywords

    • Dielectric properties
    • Electrical conductivity
    • Microwave property
    • Polyaniline

    ASJC Scopus subject areas

    • Materials Chemistry

    Cite this

    Applications of polyaniline doubly doped with p-toluene sulphonic acid and dichloroacetic acid as microwave absorbing and shielding materials. / Phang, Sook Wai; Hino, Tetsuo; Abdullah, M. H.; Kuramoto, Noriyuki.

    In: Materials Chemistry and Physics, Vol. 104, No. 2-3, 15.08.2007, p. 327-335.

    Research output: Contribution to journalArticle

    Phang, Sook Wai ; Hino, Tetsuo ; Abdullah, M. H. ; Kuramoto, Noriyuki. / Applications of polyaniline doubly doped with p-toluene sulphonic acid and dichloroacetic acid as microwave absorbing and shielding materials. In: Materials Chemistry and Physics. 2007 ; Vol. 104, No. 2-3. pp. 327-335.
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    AU - Kuramoto, Noriyuki

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