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Synthesis and Characterization of CdS Modified TiO2 Nanotubes for Studying of Photoelectrochemical (PEC) Properties

Qorbani, Mohammad | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42178 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Moshfegh, Alireza; Azimirad, Rouhollah
  7. Abstract:
  8. In this research, first thin films with nanostructures of titanium nanotube arrays (TNAs) synthesized by anodization under different applied voltage (20- 60 V) and different reaction times (120 and 200 min). The electrolyte solution for synthesizing the samples contained 90% ethylene glycol (EG), 10% DI water, 0.1 M NHR4RF and a little HR3RPOR4R to reach the pH to 5.6. The synthesized samples crystallized under annealing treatment at 500 °C (with heating rate of 9.5 °CminP -1 P). The scanning electron microscopy (SEM) analysis was indicate that the length and the inner diameter of the nanotubes have increased from 1.6 μm and 67 nm (for 30 V anodization and for 2h) to 4.2 μm and 125 nm (for 60 V anodization and for 2h). CdS nanoparticles were grown on the produced TNA by sequential-chemical bath deposition (S-CBD) with 10, 20 and 30 cycles to make a structure in the form of TNA/CdS-n (n=10, 20, 30). Besides, the size of the CdS nanoparticles was determined about 5.5 nm using both diffusive reflectance spectra (DRS) and theorical calculations. In addition, for studying photoelectrochemical (PEC) properties of the samples, the pure TNA and TNA/CdS-n structures were placed in the PEC cell (that contained 0.5 M NaR2RS) under the visible- UV light source with the power density of 40 mWcmP -2 P. The generated photocurrent density of the TNA/CdS-20 was measured about 27.5 mAcmP -2 P which is about 30 times higher than generated photocurrent density of the pure TNA. At the end, after analyzing our data, results were compared with other recent published reports.
  9. Keywords:
  10. Titanium Oxide Nanotube ; Photoelectrochemical Cell ; Anodizing ; Anodized Titanium ; Semiconductor Cadmium Sulfide Nanoparticles ; Titanium Nanotube Arrays (TNA) ; Sequential-Chemical Bath Deposition (S-CBD)

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