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Covalent Modification of Carbon Nanotubes and Its Application in Electrochemical Analysis

Author: SongGuiLing
Tutor: GaoYong
School: Xiangtan University
Course: Polymer Chemistry and Physics
Keywords: Carbon nanotubes Covalent modification Functionalized Chemically modified electrode Electrochemical pass
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 65
Quote: 0
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Abstract


Carbon nanotubes (CNTs) chemically modified to improve its solubility in the solvent, enabling its performance of the play, and further expand its application in practice. This thesis, polymer and β-cyclodextrin (β-CD) chemical modification of single-walled carbon nanotubes (SWCNTs), and β-CD functionalized SWCNTs modified glassy carbon electrode (GCE) modified GCE used to study the electrochemical behavior of certain biological molecules, and established on the basis of their analytical methods. Polymer covalent modification of SWCNTs. SWCNTs after the oxidation reaction with ethylene glycol to give a hydroxyl-modified SWCNTs, and then reacted with acryloyl chloride, so that the polymerizable double bond group introduced into the surface of the SWCNTs modified by vinyl - SWCNTs; followed by mixing acid dodecyl benzene sulfonate (SDBS) as emulsifiers, azobisisobutyronitrile (AIBN) as initiator, the emulsion polymerization method for the polymethyl methacrylate (PMMA) grafted onto the surface of the SWCNTs. Detailed study of the pre-emulsification of surface graft polymer content. The solubility experiments show enhanced SWCNTs solubility in the solvent, the polymer covalent modification. Using infrared spectroscopy (FTIR) and Raman spectra (Raman), transmission electron microscopy (TEM) of polymer modified SWCNTs structural analysis. Raman test results show that the polymer is covalently grafted to the surface of the SWCNTs and TEM analysis showed that the polymer present in the sidewall and the opening end of SWCNTs. Thermal gravimetric analysis (TGA) results showed that, SWCNTs surface graft polymer content increases with the extension of the time of the pre-emulsification and in other conditions the same. β-CD functionalized SWCNTs the modified GCE its applied research in electrochemistry. Mixed acid oxidation - SWCNTs first use, the surface carboxyl group is further converted to an acid chloride, and then reaction with the amination of β-CD, resulting in the introduction of SWCNTs surface of β-CD and β-CD covalent bond modified SWCNTs for modifying the GCE. With ascorbic acid (AA), uric acid (UA) mixed system as the research object, using cyclic voltammetry (CA) to study the electrochemical behavior of AA, UA. Specifically examine the solution pH, scan rate, substrate concentration and interfering ions experimental conditions change the electrochemical behavior of AA, UA. The results show that compared with bare GCE, β-CD covalent bond the modified SWCNTs modified GCE combine the inclusion of SWCNTs excellent electrochemical catalytic performance of β-CD for some guest compounds modified electrode with high sensitivity . Dispersed SWCNTs modified GCE compared to a non-covalent bond with the β-CD, the method can overcome the disadvantages of the high concentrations of β-CD is formed in the surface of CNTs film impede the diffusion of electrically active substrate on the electrode surface, to improve the sensitivity of the analysis electrodes and reduce power chemical potential.

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