Dissertation > Excellent graduate degree dissertation topics show

Study on Biomolecules-functionalized Carbon Nanotube and Ionic Liquid Composite Modified Electrode

Author: LiLi
Tutor: LiuXiuHui
School: Northwest Normal University
Course: Physical and chemical
Keywords: modified electrode carbon nanotubes ionic liquids Biomolecules-functionalized multiwalled carbon nanotube Rutin
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 63
Quote: 1
Read: Download Dissertation

Abstract


Carbon nanotubes exhibit many extraordinarily attractive physical and chemical properties, such as the large surface area, the good ability to promote electro-transfer reactions, remarkable catalysis towards biomolecules, good biocompatibility, and etc. Room temperature ionic liquids can be used as electrolyte as well as solvent. They also have attracted considerable attention due to their unique physical and chemical properties, such as high thermal and chemical stability, high conductivity, the ability to dissolve a wide range of organic and inorganic molecules, wide electrochemical potential window, ability to facilitate direct electron-transfer reactions, good biocompatibility and etc. Since the introduction specially, carbon nanotubes and room temperature ionic liquids have received enormous attention in the fields of electrochemistry. Moreover, it’s attractive that the combined application of them has more promising prospects in many fields of electrochemistry, for example, the fabrication of chemical modified electrode.A novel modified electrode （MWNTs-IL-Gel/GCE） was prepared with multi-walled carbon nanotubes （MWNTs） and ionic liquid, 1-butyl-3- Methylimidazolium hexafluorophosphate, to modify glassy carbon electrode. First of all, we investigate the electrochemical behaviors of rutin at the MWNTs-IL-Gel/glassy carbon electrode （GCE）. Then, we present the preparation of rutin functionalized carbon nanotubes and ionic liquid compound （MWNTs-Rutin-IL）. The MWNTs-Rutin-IL composite film was characterized by different methods, and was modified glass carbon electrode. Next, we investigate the electrocatalysis behaviors of the MWNTs-Rutin-IL/GCE for tryptophane, and discuss the electrocatalytic mechanism。The main research work was as follows:1. Electrochemical behavior of rutin on a multi-walled carbon nanotube and ionic liquid composite film modified electrodeIn this paper, the electrochemical behaviors of rutin at the MWNTs-IL-Gel/glassy carbon electrode （GCE） were investigated. Good electrocatalysis behavior towards the oxidation of rutin with enhancement of the redox peak current and decrease of the peak-to-peak separation was demonstrated. The electrochemical parameters of rutin were calculated giving values of the charge-transfer coefficient （α） and the electrode reaction standard rate constant （ks） as 0.47 and 0.2 s-1, respectively. In addition, the MWNTs-IL-Gel/GCE was characterized by different methods including electrochemical impedance spectroscopy （EIS）, scanning electron microscope （SEM）, clay film thickness, and UV–vis spectra. The oxidation peak currents of rutin in such modified electrode increased linearly with the concentration of rutin in the range from 7.2×10-8 to 6.0×10-6 molL-1 with a detection limit of 2.0×10-8 molL-1. These results suggest that the proposed electrode can be used for sensitive, simple and rapid determination of rutin.2. Study on Biomolecules-functionalized Carbon Nanotube and Ionic Liquid Composite Modified ElectrodeThe combination of biomolecules-functionalized multiwalled carbon nanotube （MWNTs） and ionic liquid （IL） yields nanostructured biointerfaces, formed a novel kinds of structurally uniform and bioelectrocatalytic activity materials. Rutin was chosen as a model biomolecules to investigate the composite system. The MWNTs-Rutin-IL composite film was Characterized by different methods including thermogravimetric analysis （TGA）, UV–vis spectra, electrochemical impedance spectroscopy （EIS） and scanning electrochemical microscope （SECM）. A pair of well-defined quasi reversible redox peaks of rutin were obtained at the MWNTs-Rutin-IL composite film modified glassy carbon electrode （GCE） by direct electron transfer between the rutin and the GCE electrode. Dramatically enhanced biocatalytic and electrocatalytic activity was exemplified at the MWNTs-Rutin-IL/GCE electrode by the oxidized of tryptophane. The oxidation peak currents of tryptophane in such modified electrode increased linearly with the concentrations of tryptophane in the range from 8×10-8 to 2×10-5 molL-1 with a detection limit of 3.0×10-8 molL-1. The unique composite material based on biomolecules-functionalized carbon nanotube and ionic liquid have wide potential applications in direct electrochemistry, biosensors, and biocatalysis.

Related Dissertations

  1. Synthesis of Benzimidazolium Ionic Liquids and Their Application in Extraction Separation,O626.23
  2. Preparation, Characterization and Application of Prussian Blue Composite Nanomaterials,TB383.1
  3. Study on Dehydration of tert-Butyl Alcohol Catalyzed by Functionalized Ionic Liquid,O643.32
  4. Studies on the Aggregation and Microstructure of Imidazolium Ionic Liquids in Solutions,O645.1
  5. Carbon Nanotubes Compound Polymer Film Modified Electrode and Its Application for Electroanalytical Chemistry,O657.1
  6. Spectral and Electrochemical Research of Epirubicin Hydrochloride with Its Analytical Application,TQ465
  7. Research on Detection of the Carbamate Pesticides by Aminoacids-matal Ions Films Chemically Modified Sencor,S481.8
  8. Imidazolium ionic liquids selective electrode and its research activity coefficient,O646
  9. Benzothiazole - pyrimidine nucleoside hybrid body and pyrone and pyrimidine synthesis of bicyclic nucleoside,O626
  10. An ionic liquid to red carp immunotoxicity,S917.4
  11. Imidazolium ionic liquids Thermal Analysis,O626.23
  12. Synthesis of t- butyl alcohol using tert-butylbenzene, the catalyst selection and research,TQ241.1
  13. SnO 2 / CNTs composite Controllable Preparation and Gas Sensitivity Study,TB383.1
  14. MWCNTs and ZnO / SnO 2 Composites and NO gas research,TB33
  15. Construction of Protic Ionic Liquid Modified Electrode and Its Enhanced Action in Direct Electron Transfer of GOD,O646
  16. Prepration of Manganses Dioxide and Investigation on the Performance of Supercapacitor,TM53
  17. Synthesis of Platinum-based Composite Catalysts and Their Electrocatalytic Properties for Methanol Oxidation,TM911.4
  18. Functional Br (?) Nsted acidic ionic liquid catalytic synthesis of cyclic carbonate reactivity,O643.32
  19. Process Properties of Hemoglobin Modified Electrode Degradating Trichloroacetic Acid,X703
  20. Rutin-induced Expressin of Glutathione-S-transferase Genes in Bombyx Mori,S881.26
  21. Determination of Organic Acids in Industrial Productions and Application of Carbon Nanotube in Chromatography Analysis,O657.75

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile