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Author: search.filters.author.Chaiyasith, SuwanSubject: search.filters.subject.Electrochemical

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    Electrochemical sensor based on PANI/MnO2-Sb2O3 nanocomposite for selective simultaneous voltammetric determination of ascorbic acid and acetylsalicylic acid
    (2016-12-01)
    Puangjan, Apinya
    ;
    Chaiyasith, Suwan
    ;
    Wichitpanya, Saniporn
    ;
    Daengduang, Sirirat
    ;
    Puttota, Silarin
    A new electrochemical sensor made from nanocomposite of manganese dioxide (MnO<inf>2</inf>)-antimony trioxide (Sb<inf>2</inf>O<inf>3</inf>) was fabricated on polyaniline (PANI) - patterned fluorine doped tin oxide (FTO) electrode (PANI/MnO<inf>2</inf>-Sb<inf>2</inf>O<inf>3</inf> nanocomposite/FTO) through a simple potentiostatic deposition method. The properties of the nanocomposite were characterized by field emission scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy and other electrochemical techniques. Such nanostructure combines the advantages of PANI (high conductivity and stability) with that of electrocatalytic species (good electrochemical activity). The sensor was applied for simultaneous determination of ascorbic acid (AA) and acetylsalicylic acid (ASA). The linear relationships between their current intensity and concentration were in the range of 6–265.42 nmol L<sup>− 1</sup> and 1.2–228.68 nmol L<sup>− 1</sup> with detection limit (S/N = 3) of 1.05 nmol L<sup>− 1</sup> and 0.20 nmol L<sup>− 1</sup>, respectively. Experimental results demonstrated that the sensor possesses high selectivity and suffers no interference from competing species. Moreover, it successfully detected AA and ASA in human urine samples with highly satisfactory results.
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    NiO/MWCNTs coated F-doped tin oxide working electrode for hydrogen peroxide detection
    (2011-01-01)
    Jandai, Boonsong
    ;
    Woointranont, Papitchaya
    ;
    Chaiyasith, Suwan
    ;
    Pecharapa, Wisanu
    In this work, NiO/MWCNTs composites were synthesized by heat treatment via two methods. MWCNTs was treated by classical oxidative with acid. The treated MWCNTs was mixed with Nickel acetate in various concentration before calcined at 400°C for 2 h to obtain the NiO/MWCNTs and compared with another method that prepared by chemically depositing nickel hydroxide onto carbon nanotubes under microwave irradiation and thermal annealing process. The modified electrode for the detection of hydrogen peroxide was successfully developed on cross-linking between NiO/MWCNTs nanocomposites and fluorine-doped tin oxide (FTO) using nafion as binder. The physical properties of the composites were investigated by Field Emission Scanning Electron Microscope (FE-SEM) and X-ray Diffractometer (XRD). The SEM results indicated that NiO nanoparticles were well distributed on the surface of MWCNTs. The cyclic voltammetry were used to confirm the successful procedure synthesis of NiO/MWCNTs/FTO and the concentration of hydrogen peroxide was determined by amperometry, by mean of the NiO/MWCNTs/nafion/FTO as working electrode. © 2011 Published by Elsevier Ltd.