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How CdS nanoparticles can influence TiO2 nanotube arrays in solar energy applications?

Qorbani, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apcatb.2014.06.053
  3. Publisher: Elsevier , 2015
  4. Abstract:
  5. In this study, titanium dioxide (TiO2) nanotube array (TNA) films are fabricated via anodization of titanium (Ti) sheet. After annealing, the films consisted of well ordered, vertically oriented TNAs of 125±6nm diameter, 38±3nm wall thickness, and 2.9±0.3μm in length. Cadmium sulfide (CdS) nanoparticles are deposited on the synthesized TNAs by sequential-chemical bath deposition (S-CBD) method with different immersion cycle (n) to produce heterogeneous TNA/CdS-n (n=10, 20 and 30) nanostructures. UV-visible absorption spectra of the samples revealed that the absorption edge of CdS modified TNAs was shifted to a higher wavelength with respect to the pure TNAs indicating band gap reduction of the TNA/CdS-n. Photocurrent response of the samples was changed with n, and the maximum photocurrent density (at steady state) of 28±1mA/cm2 (or 70±2mA/W) was obtained for the TNA/CdS-20 photoanode which is about 30 times higher than one for the pure TNA under similar condition
  6. Keywords:
  7. Nanoparticles ; Nanotubes ; Redox reactions ; Solar energy ; Synthesis (chemical) ; Titanium dioxide ; Titanium sheet ; Band gap reduction ; Cadmium sulfide nanoparticle ; Photocurrent density ; Photocurrent response ; Solar energy applications ; TNA ; UV visible absorption spectrum ; Visible light ; Cadmium sulfide
  8. Source: Applied Catalysis B: Environmental ; Volume 162 , January , 2015 , Pages 210-216 ; 09263373 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0926337314003920