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Electrochemical studies of single-walled carbon nanotubes modified electrode developed and cytochrome C on the modified electrode

Author: DuShan
Tutor: JinZuoKang
School: Anhui University
Course: Inorganic Chemistry
Keywords: Modified electrode Single - walled carbon nanotubes Cytochrome C Electrochemical Studies Direct electrochemical Self-assembly Modified gold electrodes Electrochemical reaction Oxidation treatment Electron transfer rate
CLC: O646
Type: Master's thesis
Year: 2002
Downloads: 171
Quote: 1
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Abstract


In l99l, carbon nanotubes were discovered by Iijima, Which had high surface area,high electrical conductivity, good chemical stability and significant mechanicalstrength. As they are intriguing new members in the carbon family, many theoreticaland experimental studies have been focused on their unique properties and potentialapplications. They are.considered to have the ability to promote electron transferreactions because of their subtle electronic properties when used in theelectrochemical reactions. It’s the focus of this thesis tO prepare the single-wallcarbons nanotubes (SWNTs) modified electrodes and study their applications in thedirect electrochemistry of cytochrome c.First, two different methods were used to prepare single-wall carbon nanotubesmodified gold electrodes in tl1is study. The SWNT-modified electrode (noted asSWNT/Au electrode) was prepared by the adsorption ofcarboxyl-terminated SWNTswhich were oxidatively processed from DMF dispersion on the gold electrode. Theoxidatively processed SWNT tips were covalently modified by coupling with amines(AET) to fOrln amide linkage. Via Au-S bonding, the self assembled monolayer ofthiol-functionalized nanotubes on gold surface was fabricated so as to prepare SWNTand AET doubly modified electrode (noted as SWNT/AET/Au electrode). Moreover,the modified electrodes were investigated fOr the electrochemical behavior ofcytochrome c. It was shown from electrochemical experiments that cytochrome cexhibited direct electrochemical responses on the both electrodes, but only the currentof diffusion existed on the SWNT/Au electrode while both the current of diffusionand adsorption of cytochrome c occurred on the SWNT/AET/Au electfode.Photoelastic Modulation Infared Reflection Absorption Spectroscopy (PEM-IouS)and Quartz Crystal Microbalance (QCM) were employed to verify the adsorption ofSWN’fs on the gold electrodes. The results proved that SWNTs could enhance the2direct electron transfer process between the electrodes and cytochrome c.We also synthesized two kinds of conjugated compounds wth long chain, whichhad the similar structures to the 2-aminoethane-thiol hydrochloride (AET). Havingthe hydrosulfide and amino grouP on the both ends, they could be utilized to reactwith the oxidatively processed SWNT tips to form amide linkage. Va Au-S bonding,the self assembled monolayer of thiol-functionalized nanotubes on gold surface wasfabricated so as to prepare SWNT and compounds doubly modified electrode. CyclicvoltamInetry(CV), differnt pulse voltaInInetry (DPV) were used to study directelectrochemistry of cytochrome c on the above modified electrodes. The resultsshowed that direCt electron transfer occimd between cytochrome c and theelectrodes, and the quasi-reversible electrode process was diffesion-controlled.Through the comParison of the above modified electrOdes, the followingconclusions could be draWn:(l) Because the modification pattems were different,varous electrodes had differenty actual areas (efficient areas), The modifiedelectrodes by self assemble had siZable areas Whch were larger than that of theelectrodes by direct adsorption of SWNTs; (2) The modified electrodes byself assemble rePresented better Promoton effect to cytochrome c than the ones bydirect adsorption of SWNTs; (3) As the conjugation degree of modification systemincreased, the overpotential decreased and the reversibility of redox reaction becamebetteL

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