Dissertation > Excellent graduate degree dissertation topics show

Highly Ordered TiO2/FTO Nanotube Array Photoelectrode: Fabrication, Modification of CdS and Its Optical Properties

Author: ZhangQiJun
Tutor: WangChengWei
School: Northwest Normal University
Course: Condensed Matter Physics
Keywords: free-standing TiO2 nanotube membranes TiO2/FTO photoelectrode modification of CdS Optical absorption
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 101
Quote: 0
Read: Download Dissertation

Abstract


TiO2 nanomaterials have been widely studied due to their unique electrical and electrochemical properties which are suitable for sensing, catalysis and solar cells. In recent years, TiO2 nanotubes with high surface-to-volume ratios have received considerable attention because of their potential applications of highly efficient photocatalysis and photovoltaic cells. If the TiO2 nanotube membranes could be transferd onto the FTO substrates, the transparent and conductive TiO2/FTO photoelectrode would have a better application in the photoelectric conversion filed. This dissertation titled“Highly ordered TiO2/FTO nanotube array photoelectrode:fabrication, modification of CdS and its optical properties”mainly describes the following work and results:1. The large-scale （18 mm×11 mm）, highly-ordered, vertically-oriented free-standing TiO2 nanotube membranes were fabricated by three-step anodization Ti foils（0.2 mm） in ethylene glycol containing 0.25 wt.% NH4F. It is found that the optical energy gap （Eg） of TiO2 nanotube membranes could not only have high transmissivity （4002500 nm）, but also be effectively modulated by different anodic voltage. Obviously, this work would be beneficial to apply in organic-inorganic photovoltaic devices.2. Then the as-prepared free-standing membranes were transferred to FTO-coated glass substrates with TiO2 sol, and the semitransparent TiO2/FTO photoelectrode was obtained after annealing treatment.3. The TiO2/FTO photoelectrode was modified with CdS by the sequential-chemical bath deposition （S-CBD） method in order to extend the optical absorption range of bare TiO2/FTO. The measurement results show that the band-gaps decrease from 3.22 eV for bare TiO2/FTO to 2.43 eV for CdS-modified TiO2/FTO. Meanwhile, the optical absorption band-edges of CdS-modified TiO2/FTO have efficiently shifted from 380 nm to 554 nm, which could lead to an extended optical absorption range from the ultraviolet to the visible.

Related Dissertations

  1. Study on the Coloration Effect of Four Optical-Filming Powders,TB303
  2. First-principles Study on Magnetic and Optical Properties of Rutile TiO2,O614.411
  3. Reflective Optical Fiber Temperature Sensor Based on Temperature-Dependent Optical Properties of ZnO Film on the Sapphire Prism Surface,TP212.11
  4. Photocurrent of Hydrogenated Nanocrystalline Silicon Thin Films,TB383.2
  5. Process of Optical and Thermal Reaction of Nanometallic Al Composite Nanoenergetic Materials,TB383.1
  6. The Applications and Optical Properties of Nano Heterostructures,O471.1
  7. Research on Nigrescence in High Electric Field and Piezoelectric Effect of Cubic Boron Nitride,TN304
  8. TiO_2 Nanotube Arrays Preparation, Characterization and Properties,TB383.1
  9. Study on Synthesis, Microstructure and Properties of Biomorphic Oxides with Hierarchical Pore Structure Templated with Plant Tissues,TB383.4
  10. The Absorptive Spectra of Semiconductor Quantum Dot,O472.3
  11. Study of Differential Optical Absorption Spectroscopy (DOAS) Detects Air Component,TP274
  12. Nano TiO_2 Catalyst and its modification by ECR nitrogen plasma research,TN304
  13. Study on the Absorption and Modulated Properties and Its Applications of Nanobiological Material-Bacteriorhodopsin,Q936
  14. A Study on Atmospheric Monitoring Based on Differential Optical Absorption Spectroscopy,O433.1
  15. Study on the Dyeing Capability of Accumulating Luminous Fibers,TS193.8
  16. Narrow- band model in the gas radiation applied research,TK124
  17. Research on Preparation and Properties of Magnetron Sputtering Sb-ZnO Thin Film,TB383.2
  18. The Research on the Laser and Optical Fiber Detecting Method for the On-Line Measurement of the Oil in Waste Water,TP274.5
  19. Semiclassical recurrence spectra of Li atoms in parallel electric and magnetic fields,O562.2
  20. Used in photoconductive terahertz generation switching technology research,TN25
  21. Prepare Black Glass of Highly Absorb Sunlight and Research Its Spectrum Character,TQ171.1

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