Dissertation > Excellent graduate degree dissertation topics show

Fabrication and Electrochemistry of Two-dimensional Ordered SiO2 Cavities on Electrode Surfaces

Author: WeiWenJuan
Tutor: ZhouQun
School: Suzhou University
Course: Inorganic Chemistry
Keywords: Polystyrene Particle Self-assembly Micro-cavity Array Electrochemistry Confinement Effect
CLC: O613.72
Type: Master's thesis
Year: 2011
Downloads: 41
Quote: 0
Read: Download Dissertation

Abstract


Uniform polystyrene particles were synthesized by a dispersion polymerization of styrene in ethanol-water mixtures. With self-assembled monolayer （SAM） techniques, the two-dimensional array arrangement of the polystyrene （PS） spheres were formed and transferred onto the surface of ITO electrode. With close-packed PS microspheres as the template, silica （SiO2） was deposited into the interstices of the PS particles via sol-gel methods or electrodeposition. After the removal of the templating PS particles, an array of two-dimensional reversed micro-cavities of SiO2 was subsequently obtained. The depth and diameter of the SiO2 cavities can be easily varied through the alteration of the templating particle size.Silver nanoparticles were electrochemically deposited into the bottom of the cavities, and there were no Ag particle grew on the internal wall or outer fringe of the cavities. It demonstrated that the electrochemical reaction occurs at the bottom of the silica cavities. This is due to the poor conductivity of the SiO2 cavities structure. Thus, the SiO2 cavities exhibit a confinement effect on the electrochemical reactions the electrode, making the electrode to act as an array of microelectrodes. The confinement effect was further confirmed by the cyclic voltammetric behavour of Fe（CN）63- in KCl solution. Moreover, the cyclic voltammetric behavour of methylviolegen cation (MV2+) in KCl solution on the SiO2 cavities modified electrode suggested that the negatively charged surfaces of SiO2 cavities, probably resulting from the deprotonation of hydroxy, lead to selectively enrich the positively charged MV2+cations. This may consequently improve the detection sensitivity of the cation species in solution. Furthermore, the selective enrichment effect of SiO2 cavities was strongly dependent on the pH value of the solution.A novel biosensor was constructed by immobilization of MP-11 inside 2-D arrays of micrometer hemispherical SiO2 cavities on the surface of ITO electrodes. With SAMs techniques, the monolayer of 4-mercaptobenzoic acid （MBA） was attached on Ag nanoparticles deposited inside the SiO2 cavities through S-Ag bond. With the MBA as a linker, microperoxidase-11 （MP-11） can be immobilized into the cavities through the covalent bond formed between the carboxyl of MBA and the residual amino group of MP-11.Preliminary experimental data showed that such MP-11 modified electrode displayed good electrocatalytical properties for the O2 reduction.

Related Dissertations

  1. Containing pyrazoline chromophore small molecule and polymer synthesis and fluorescent properties of,O631.3
  2. Based magnetic fluid assembled hollow magnetic carbon microspheres and functional complexes,TB383.4
  3. Substituted phthalocyanine synthesis and molecular self-assembly behavior,O621.3
  4. The Study of the Self-assembly Behaviors of Some Chiral Molecules with Fluorocarbon Chains,O621.3
  5. In-situ Electrosynthesis and Characterization of Molecularly Imprinted Polymers,O631.3
  6. Synthesis and Characterization of Polyaniline Micro/nano Structure and Its Composites,TB383.1
  7. The Process of Cysteine Self-assembly on Gold Nanoparticle Modified Electrodes and Their Application,TB383.1
  8. Self-Assembly and Photo-Responsive Behavior of Azobenzene-Based Copolymer,O631.3
  9. Synthesis and Self-Assembling Behaviors of Nitrogen-Doped Heteropolycyclic Aromatic Hydrocarbons,O621.2
  10. Self-assembly Behavior of Tussah Silk Fibroin and Application in Drug Controlled Release,R318.08
  11. Lactic acid -based copolymer / vermiculite ceramic composites and properties of,TB332
  12. Syntheses and Structures of Sulfur-Rich Compounds with Carboxylate and Imine Groups,O621.13
  13. Effects of Self-assembled IKVAV Peptide Nanofibers on Neural Progenitors Cells,R329
  14. Study of Pipeline Internal Corrosion of Sulfate-reducing Bacteria in the Presence of Carbon Dioxide,TE988.2
  15. Direct Electrochemistry of Proteins on CdTe Quantum Dots,O646
  16. Electrocatalytic Oxidation of Dyes Using Cobalt Phthalocyanine Modified Activated Carbon Fiber Electrode,X791
  17. Electrochemical Treatment of Water-Based Painting Ink Wastewater in a Tubular Reactor,X796
  18. New PHENYLTHIOPHENE rod- coil block Synthesis and Properties of liquid crystal molecules,O753.2
  19. Synthesis and Characterization of Main Chain Supramolecular Liquid Crystals Through Intermolecular Hydrogen-bonding,O753.2
  20. The Design and Research of Sewage Multiparameter Monitoring System Based on Embedded,X832
  21. Self-Assembly with Chondrogenically Differentiated Human Mesenchymal Stem Cells,R684

CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Non-metallic elements and their compounds > Part Ⅳ family of non-metallic elements (carbon and silicon ) and its compounds > Si Si
© 2012 www.DissertationTopic.Net  Mobile