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    Electrochemical detection of Cr(VI) with carbon nanotubes decorated with gold nanoparticles


    Breslin, Carmel B. and Branagan, David and Garry, Lynn M. (2019) Electrochemical detection of Cr(VI) with carbon nanotubes decorated with gold nanoparticles. Journal of Applied Electrochemistry, 49. pp. 195-205. ISSN 0021-891X

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    Abstract

    A nanocomposite consisting of gold nanoparticles deposited on the side walls of functionalised multi-walled carbon nanotubes, Ox-MWCNT-Aunano, was prepared using a simple chemical reduction. The nanoparticles were well dispersed with a mean diameter of 7.5 nm and had a face-centred cubic structure and a gold loading between 2.0% and 2.6% by weight. These gold decorated nanotubes were cast onto a gold electrode to form a uniform and homogeneous sensor. Using cyclic voltammetry, the reduction of Cr(VI) was observed at a peak potential of 0.52 V versus SCE in an acidified H2SO4 solution, pH 2.0. A linear calibration curve with a sensitivity of 0.28 mA mM− 1 and a LOD of 7.2 × 10− 7 M was obtained using constant potential amperometry coupled with rotating disc voltammetry. The electrochemical detection of Cr(VI) was also observed at a MWCNT-modified gold substrate but with a higher LOD, illustrating the advantage of combining the gold nanoparticles with MWCNTs. The sensor showed good selectivity for the detection of Cr(VI) in the presence of Cu(II), chloride and nitrates and in a real water sample. This was attributed to the electropositive reduction potentials of Cr(VI), the acidic H2SO4 supporting electrolyte that provides a well-known cleaning effect at gold, and the size and good dispersion of the gold nanoparticles that minimise particle agglomeration.

    Item Type: Article
    Additional Information: Cite as: Breslin, C.B., Branagan, D. & Garry, L.M. Electrochemical detection of Cr(VI) with carbon nanotubes decorated with gold nanoparticles. J Appl Electrochem 49, 195–205 (2019). https://doi.org/10.1007/s10800-018-1259-2
    Keywords: Electrochemical; detection; Cr(VI); carbon nanotubes; decorated; gold nanoparticles;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 14126
    Identification Number: https://doi.org/10.1007/s10800-018-1259-2
    Depositing User: Dr. Carmel Breslin
    Date Deposited: 04 Mar 2021 15:05
    Journal or Publication Title: Journal of Applied Electrochemistry
    Publisher: Springer Verlag
    Refereed: Yes
    URI:

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