Preparation And Electrochemical Application Of Supermolecule Self-assembled Modified Electrode

In this thesis, supermolecule self-assemble modified electrodes were fabricated by using self-synthetical supermolecule compound such as 6-OTs-β-CD and functional ionic liquid of pyridinium derivative of quaternary ammonium salt ofβ-cyclodextrin ([CDbPy]BF4) to study the electrochemical behavior of bioactive materials and contamination of environment such as epinephrine, ascorbic acid, 1-nitrosol-2-naphthol and chloronitrobenzene (CNB). Additional sensitivity and selectivity can be provided by utilizing specifically character and moleculed structure of modifiers to study electrocatalyze and analytical determination. The work of this thesis was divided into four parts:In the first part, supermolecule compound 6-OTs-β-CD was synthesized and used it as modifier to fabricate modified electrode 6-OTs-β-CD/L-cys/Au. With potassium ferricyanide as electrochemical probe, charactered the modified electrode by CV and EIS and investigated the electrochemical speciality of 1-nitroso-2- naphthol by CV at the first time. Sensitive semi-reversible redox peaks were observed at +0.582 V and -0.482 V (vs .SCE)in 0.1mol/L pH 5.04 phosphate buffer solution. The experimental results showed that the charge transfer process in the modified electrode was controlled by diffusion. The anodic current increased linearly with the concentration of 1-nitroso-2- naphthol in the range of 1.0×10-6 ~ 1.0×10-4 mol/L. The determination limit was 3.33×10-7 mol/L. The relative standard deviation of 1.66% was obtained by nine successive determination of 5.0×10-5 mol/L 1-nitroso-2- naphthol.In the second part, modified electrode 6-OTs-β-CD/PDDA/Au was fabricated, charactered it by CV and EIS with potassium ferricyanide as electrochemical probe, and investigated the electrochemical speciality of epinephrine by CV and DPV. A sensitive irreversible oxidation peak was observed at +0.354V( vs .SCE)in 0.1mol/L pH 7.4 phosphate buffer solution. The experimental results showed that the charge transfer process in the modified electrode was controlled by diffusion. This modified electrode had been used satisfactorily in the determination of epinephrine content in injection.In the third part, functional ionic liquid ([CDbPy]BF4) was synthesized and used it as modifier to fabricate three type self-assembled modified electrode on the different electrode at the first time. With ferrocene as electrochemical probe, investigated the effect of different bilayer films and charactered these modified electrodes by CV, EIS and Chronocoulometry. Moreover, the real area of the modified graphite electrode was obtained by calculating. The influence of scan rate to ferrocene was investigated and the experimental results showed that the charge transfer process in the modified electrode was controlled by diffusion. Propertie of ([CDIL]/L-cys)2/Au was the best than the others by comparing the parameters of all modified electrodes.In the forth part, different functionalized ionic liquid modified electrodes were used for researching the electrochemical behaviors of ascorbic acid and chloronitrobenzen, respectively. The effect of scan rate was investigated in the optimized condition, and the experimental results showed that the charge transfer process in the modified electrode was controlled by diffusion. This modified electrode has been used satisfactorily in the determination of ascorbic acid content in Vc tablet. The result showed that modified electrode possessed the better electrocatalysed effect on the deoxidization of p-CNB than o- CNB and m- CNB, wherefore, p-CNB was used was used as the sample of measurement in this paper with satisfactory result.