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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/065/04/0731-0738

    • Keywords

       

      Immobilization; functionalized; single-walled carbon nanotube; chemical sensor; determination; hydrogen peroxide.

    • Abstract

       

      Chemical functionalization of single-walled carbon nanotubes with redox mediators, namely, toluidine blue and thionin have been carried out and the performance of graphite electrode modified with functionalized carbon nanotubes is described. Mechanical immobilization of functionalized single-walled nanotube (SWNT) on graphite electrode was achieved by gently rubbing the electrode surface on carbon nanotubes supported on a glass slide. The electrochemical behaviour of the modified electrodes was investigated by cyclic voltammetry. The SWNT-modified electrodes showed excellent electrocatalytic effect for the reduction of hydrogen peroxide. A decrease in overvoltage was observed as well as an enhanced peak current compared to a bare graphite electrode for the reduction of hydrogen peroxide. The catalytic current was found to be directly proportional to the amount of hydrogen peroxide taken.

    • Author Affiliations

       

      D R Shobha Jeykumari1 S Senthil Kumar1 S Sriman Narayanan1

      1. Department of Analytical Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India
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