Loading...

Synthesis and Study of Photocatalytic Activity of Biphasic Titanium Dioxide Loaded with Au@Ag@Au Core Double Shell Bimetallic Nanoparticles

Daneshvar Asl, Shervin | 2019

918 Viewed
  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 52295 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Sadrnezhad, Khatiboleslam
  7. Abstract:
  8. The aim of this project is the synthesis and study of the photocatalytic activity of biphasic titanium dioxide loaded with Au@Ag@Au core double shell bimetallic nanoparticles. The creation of nanostructure, utilization of hierarchical biphasic morphology, loading of light-sensitive particles, and stabilization of photocatalytic particles have enhanced the titanium dioxide photocatalytic activity via approaches of (1) sensitization to visible light, (2) separation of charge carriers produced by light irradiation and minimization of their recombination, and (3) advancing reaction and absorption of reactants by increasing quantity and quality of surface active sites. Hierarchical TiO2 nanorod/nanoflower thin film was synthesized on a fluorine doped tin oxide glass via three stages of (i) TiCl4 treatment, (ii) hydrothermal, and (iii) aqueous chemistry. At this step of the procedure, the synthesis parameters and effective factors on them were studied and optimized to obtain the appropriate morphology for maximum use of light. A seeding-growth approach was successfully used to prepare Au@Ag@Au core double shell nanoparticles as the stable and efficient plasmonic nanosystem. The prepared nanoparticles were loaded on a rutile-nanorods/anatase-nanoflowers thin film via the impregnation method. The photocatalytic capability of the newly developed nanostructure was higher than P25 TiO2 thin film by 40% under visible light and by 100% under UV light irradiation. Photogenerated charges separation at the junctions of rutile-nanorods and anatase-nanoflowers along with localized surface plasmon resonance followed by the hot electron transfer from the core double shell nanoparticles to TiO2, resulted in the enhancement of photocatalytic activity observed under visible light irradiation. Under UV light illumination, the charge separation effect plus the electron trapping by Au@Ag@Au nanoparticles were responsible for the photocatalytic performance improvement of TiO2
  9. Keywords:
  10. Rutile/Anatase Titanium Dioxide ; Nanoflowered Nanorod ; Gold-Silver and Gold Core Double Shell Nanoparticle ; Localized Surface Plasmons ; Photocatalyst

 Digital Object List

 Bookmark

...see more