Application Of Carbon Nanotubes / Metal Phthalocyanine Composites In Biosensors

With 1,8-diazabicyclo(5.4.0)undec-7-ene(DBU) as catalyst, multiwalled carbon nanotubes-metal phthalocyanine composites were prepared by in-situ synthesis. The multiwalled carbon nanotubes-metal phthalocyanine composites were characterized with ultraviolet-visible absorption spectromtry(UV-VIS), fourier transform infrared spectroscopy(FT-IR), transmission electron microscopy(TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The result shows that the conjugated ring of metal phthalocyanine combined with highly delocalized bigπbond of multiwalled carbon nanotubes by non-covalent, the metal phthalocyanine adsorbed on the surface of multi-walled carbon nanotubes.The multiwalled carbon nanotubes-cobalt phthalocyanine(MWNTs-CoPc) modified electrode and the multiwalled carbon nanotubes-cobalt phthalocyanine/ catalase(MWNTs-CoPc/Cat) modified electrode were prepared by drop coating method. Studied the MWNTs-CoPc modified electrode to the electrocatalytic property of ascorbic acid and the MWNTs-CoPc/Cat modified electrode to the electrocatalytic oxidation of hydrogen peroxide by electrochemical method. The study found that the MWNTs-CoPc modified electrode has good catalytic to the oxidation of ascorbic acid, effectively reduce the oxidation potential of ascorbic acid. The MWNTs-CoPc/Cat modified electrode achieved the direct electron transfer of catalase on the surface of electrode, and showed a better electrocatalytic activity of hydrogen peroxide.