Abstract
In this paper, a novel polyaniline (PANI) nanofibers/ionic liquid-functionalized carbon nanotubes (IL-CNTs) composite-modified electrode was prepared, and its application on electrocatalytic oxidation of guanine of sequence-specific DNA was investigated. The surface morphology and the related electrochemical behaviors of the PANI/IL-CNTs composite film were characterized with scanning electron microscopy, electrochemical impedance spectroscopy and cyclic voltammetry, respectively. The PANI/IL-CNTs composite showed a good response current toward the direct electrooxidation of ssDNA due to the synergistic effect between PANI nanofibers and IL-CNTs. Based on this, it was adopted as an excellent sensing platform for highly sensitive determination of guanine. The detection limit was 3.1 × 10−9 mol/L.
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