A novel voltammetric p-nitrophenol sensor based on ZrO2 nanoparticles incorporated into a multiwalled carbon nanotube modified glassy carbon electrode

作者：Devadas Balamurugan; Rajkumar Muniyandi; Chen Shen Ming^*; Yeh Pin Chun

来源：Analytical Methods, 2014, 6(13): 4686-4691.

DOI：10.1039/c4ay00628c

Herein, we report the incorporation of zirconium oxide (ZrO2) nanoparticles into functionalized multiwalled carbon nanotubes (fMWCNTs/ZrO2) to form a nanocomposite film via a simple and clean in situ method based on the electrochemical redox reaction of zirconyl chloride (ZrOCl2). The electrocatalytic properties and surface morphology of the as-prepared nanocomposite were studied using cyclic voltammetry, electrochemical impedance spectroscopy and field emission scanning electron microscopy. The as-prepared fMWCNTs/ZrO2 nanocomposite-modified glassy carbon electrode shows a prominent electrocatalytic activity towards the voltammetric determination of p-nitrophenol. The presence of fMWCNTs in the film enhances the surface coverage concentration and also increases the electron transfer rate constant of the ZrO2 nanoparticles. The modified electrode has a linear range of 2-26 mu M for p-nitrophenol. The proposed film was also used successfully for the voltammetric determination of p-nitrophenol in river and tap water samples with a linear range of 0-24 mu M. A well-defined peak for the detection of p-nitrophenol in water samples has proved this fMWCNTs/ZrO2 nanocomposite-modified electrode to be a successful sensor material. The proposed film has long-term stability.

• 出版日期2014