Preparation And Graft Of The Grown In Situ Carbon Nanotube Chemically Modified Electrode

Because carbon nanotube has remarkable electronic property, large surface areas and huge function groups, the carbon nanotube chemically modified electrode (CNT-CME) was usually applied to the electro-catalysis and electro-analytical chemistry fields, such as the detection of water pollution, the concentration of certain substances in the cells and the level of exhaust gas pollution in the atmosphere. The hollow structure and enormous outer surface of carbon nanotube give it many wonderful properties. For example, the outer surface modification of carbon nanotube could generate unique catalysts. Therefore, the modification of carbon nanotube can greatly improve the electrochemical properties of CNT-CME, which makes CNT-CME have a broad application prospect in the field of electrochemical analysis.In this thesis, the grown in situ carbon nanotube chemically modified electrode (GSCNT-CME) was prepared on the basis of the group and modified by grafting polyaniline (PANI) or graphene on the surface of CNT, which made the electrochemical properties of GSCNT-CME greatly progress. The main researches are as follows:(1) The GSCNT-CME was prepared by growing carbon nanotube (CNT) in situ on the graphite electrode (GE) via a liquid ethanol flame on the basis of the group, through pyrolysis ferrocence in high temperature instead of direct current electrochemical deposition nickel catalyst. The obtained GSCNT-CME was characterized by scanning electron microscopy (SEM), and the electrochemical performance of the GSCNT-CME was characterized by cyclic voltammetry (CV) using the [Fe(CN)6]3-/[Fe(CN)6]4-solution. The results showed that changing the way of introduction of catalyst not only guaranteed the prepared GSCNT-CME having good electrochemical properties, but also improved the efficiency and reduced the preparation cost.(2) The electrochemical properties of electrode were improved by the introduction of conductive polymer-polyaniline (PANI). The polyaniline and carbon nanotube chemically modified electrode (PANI/GSCNT-CME) was prepared through grafting polyaniline on the surface of CNT by in situ polymerization. The obtained PANI/GSCNT-CME was characterized by scanning electron microscopy (SEM), and the electrochemical performance of the PANI/GSCNT-CME was characterized by cyclic voltammetry (CV) in the [Fe(CN)6]3-/[Fe(CN)6]4-solution. The results showed that polyaniline equably coated on the surface of CNT and formed the15nm thickness of polyaniline molecular layer after polymerization. The PANI/GSCNT-CME had better electrochemical properties than GSCNT-CME.(3) The electrochemical properties of electrode were improved by the introduction of a novel carbon material-graphene (GR). The GR/GSCNT-CME was prepared by reduction graphene on the surface of CNT via high temperature annealing or electrochemical method. The scanning electron microscopy (SEM) and cyclic voltammetry (CV) were used to characterize its surface topography and electrochemical performances. The results showed that the GR/GSCNT-CME can make carbon nanotubes and graphene achieve the synergistic effect, which enormously accelerated the electron transfer rate and improved the electrochemical properties.