Dissertation > Excellent graduate degree dissertation topics show

Surface Enhanced Raman Spectroscopic Studies on Au@TiO2 Nanoparticles and Titanium Electrode

Author: QinWei
Tutor: GuRenAo；YaoJianLin
School: Suzhou University
Course: Physical and chemical
Keywords: surface enhanced Raman spectroscopy (SERS) Au@TiO2 nanoparticles photocatalysis reactions Titanium electrode
CLC: O614.411
Type: Master's thesis
Year: 2009
Downloads: 188
Quote: 0
Read: Download Dissertation

Abstract


As one of the in-situ spectroscopic techniques with high surface sensitivity in probing the interfacial species, surface enhanced Raman spectroscopy （SERS） has an advantage of investigating processes at metal and interfacial structure. With the development of application of titanium in navigation, petroleum industry, and medicine etc, it shows great importance of SERS studies on the surface behaviors of titanium in electrolytes, especial in corrosion and adsorption behavior of molecules to titanium. As one of the most important oxides of titanium, titanium dioxide （TiO2） is quite a“hot”catalyst well known of its great friendship to environment and high-efficiency in photocatalysis reactions. In this work, Au@TiO2 nanoparticles was successfully synthesized and with SERS-enhancement from Au core, photocatalytic reactions was investigated employing SERS. In addition, a novel way of roughing Titanium electrode was achieved which expand SERS application to Titanium. Main work and results as following:Based on the polyelectrolyte-mediated electrostatic adsorption, a novel way of layer-by-layer （LbL） synthesizing Au@TiO2 nanoparticles has been investigated in this work. A number of experimental detections demonstrated that Au@TiO2 nanoparticles synthesized through assembling Au on silicon wafers have high-stabilization and well-defined shell thickness, indicating a successful way of synthesis, which could provide a great deal of Au@TiO2 products conveniently.In SERS studies of probe molecules adsorbed onto Au@TiO2 nanoparticles, it was also been found that the SERS-enhancement from Au core was decreasing when TiO2 shell was getting thicker, meanwhile, there proved“pinhole”existing in the TiO2 shell, which influenced intensity of SERS observably. Additionally, A stretch process in space of nanoparticles to“grow larger”in hydrolysis step was observed. Finally, photocatalytic reactions between Au@TiO2 nanoparticles and Methylene Blue trihydrate indicated that Au@TiO2 nanoparticles had quite high activity in catalytic reactions. Together with SERS detections, it may provide deep-insight information of catalytic reactions.After roughing Titanium electrode in different ways, SERS of Pyridine adsorbed on Titanium electrode surface was successfully obtained for the first time in the work, using a highly sensitive confocal microprobe Raman system. The result indicated that the most SERS-active roughened Titanium surface could be obtained at the concentration of hydrofluoric acid 0.33%（wt） and 5 min for etching. According to the formula based on the confocal microprobe Raman system and its definition, surface enhancement factor （G） of roughened Ti electrode was calculated about 100 and the SERS effect of about 1.65 orders exists for Titanium in our experiment and calculation.

Related Dissertations

  1. Adsorption and Reaction of Iron Protoporphyrin IX on Electrode Surfaces with in Situ Vibrational Spectroscopies,O646
  2. Preparation of SiO2, ZnO Hollow Spheres and SiO2/Ag Composite Spheres and Their Properties,TB383.4
  3. Preparation and Properties of Condcuting Polymers and Their Nanocomposites,TB383.1
  4. SERS Spectrum Researches of Aromatic Heterocyclic Compounds Contain Sulfur.,O626
  5. Surface-enhanced Raman Study of Molecules Adsorbed on Nanostructured Metal Surface,O657.3
  6. Spectroscopic Study on the Cathode Material and Solid Electrolyte Interface for Lithium Secondary Batteries,TM911
  7. Study of Temperature Dependence of C70 Molecules by SERS,O437.3
  8. The Oxidation Behavior and In-situ SERS Study of Isosafrole (Safrole) in Non-aqueous System,TS227
  9. The Study of Non-enzymatic Cleavage of Oligodeoxyribonucletide by Cerium Complex at Specific Site,O641.4
  10. The Application of AgcoreAushell Bimetallic Nanoparticles in Surface-Enhanced Raman Immunoassay Analysis,O657.37
  11. The Application of Surface-Enhanced Raman Spectroscopy for Immunoassay,O657.37
  12. Photoelectronic and Spectroscopic Properties of Bilayer Lipid Membrane(BLM)incorporated with Fullerenes:A New Molecular Device,O484.41
  13. Preparation of Core-Shell SERS Substrates and Their Application in Detecting Trace Pesticide Residue,X839.2
  14. Spectral study of the composite LB film modified silver electrode,O657.3
  15. The Interfacial Structure of Ionic Liquids/Metal Probed by Electrochemistry and SERS,O647.1
  16. The Morphology Control and SERS Properties Research of Silver Particles by Chemical Etching Method,TG171
  17. Studies on Synthesis, Characterization and Properties of Fe-V Co-doped TiO2 Catalyst,O614.411
  18. The Study of Preparation and Photocatalytic Activity of TiO2 by Electrospinning,O614.411
  19. Influence of Nanostructure on Hydrophobic Properties at TiO2 Surface Studied by Molecular Dynamics Simulation,O614.411
  20. Of Bi N Co-doped TiO \u003csub\u003e 2 \u003c/ sub\u003e of the preparation and performance,O614.411
  21. Iron, lanthanum -doped nano TiO \u003csub\u003e 2 \u003c/ sub\u003e Preparation and photocatalytic properties,O614.411

CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section Ⅳ group metal elements and their compounds > The titanium Vice family ( IV B group metal elements) > Ti Ti
© 2012 www.DissertationTopic.Net  Mobile