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Journal of Materials Science: Materials in Electronics

, Volume 30, Issue 24, pp 20935–20946 | Cite as

Study of TiO2 nanotubes decorated with PbS nanoparticles elaborated by pulsed laser deposition: microstructural, optoelectronic and photoelectrochemical properties

  • A. HajjajiEmail author
  • S. Jemai
  • K. Trabelsi
  • A. Kouki
  • I. Ben Assaker
  • I. Ka
  • M. Gaidi
  • B. Bessais
  • M. A. El Khakani
Article
  • 59 Downloads

Abstract

Titanium dioxide nanotube arrays (TiO2 NTAs) have been synthesized using the electrochemical anodization procedure. Lead sulfide nanoparticles (PbS NPs) were deposited on TiO2 NTAs (PbS NPs/TiO2 NTAs) using the pulsed laser deposition (PLD) method. The prepared samples (PbS NPs/TiO2 NTAs) were characterized using scanning electron microscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), UV–Vis spectroscopy and photoluminescence. The size of the PbS NPs was controlled by varying the number of laser pulses (NLP) during the PLD process. TEM observations show that the PbS NPs are in the range of 10–20 nm, consistent with the results obtained from XRD. HRTEM and diffuse reflectivity show that, at NLP ≥ 2500, the growth of the PbS NPs occurs on a previously formed PbS layer. Transmission and absorption spectra show that the PbS-NPs have an indirect optical bandgap which is particle size independent. This optical bandgap corresponds to excitonic transitions, which are greatly affected by oxygen defects, off-stoichiometry and other surface state defects, particularly for smaller NPs (NLP < 2500). The absorption spectra of the TiO2 NTAs show that the PbS NPs extend the absorption range of the TiO2-NTAs from the ultraviolet to the visible region, indicating that the PbS NPs/TiO2 NTAs heterojunction facilitates the separation of the photogenerated charge carriers. Photoelectrochemical analyses show that a maximum photocurrent current density of ~1.05 mA/cm2 and a photoelectrochemical conversion efficiency of 2.5% are reached for NLP = 2500 under an illumination of 100 mW/cm2 in the UV–Vis range.

Keywords

PLD PbS nanoparticles TiO2 nanotubes Photoelectrochemical properties 

Notes

Acknowledgements

Dr. A. Hajjaji would like to acknowledge the financial support the Tunisian Ministry of higher education and scientific research. Prof. M. A. El Khakani is also grateful for the financial support of the Natural Sciences and Engineering Research Council (NSERC) of Canada and from the FRQNT (Le Fonds de Recherche du Quebec Nature et Technologies) of Quebec. Dr. Ibrahima Ka thanks FRQNT for its support through a personal fellowship.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institut National de la Recherche ScientifiqueINRS-Énergie, Matériaux et TélécommunicationsVarennesCanada
  2. 2.Laboratoire de PhotovoltaïqueCentre de Recherches et des Technologies de l’EnergieHammam-LifTunisia
  3. 3.Laboratoire de Microscopie ElectroniqueFaculté des Sciences de BizerteBizerteTunisia
  4. 4.Laboratory of Nanomaterials and Systems for Renewable EnergyCentre de Recherches et des Technologies de l’EnergieHammam-LifTunisia
  5. 5.Center of Advanced Materials Research, Research Institute of Sciences and EngineeringUniversity of SharjahSharjahUAE

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