| Successive Synthesis of WO3/Pd Core-Shell Nanoparticles by Laser Ablation in Liquid |
| Paper ID : 2155-UFGNSM13-FULL (R1) |
| Authors: |
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Hossein Kalhori *1, Mehdi Ranjbar2, seyyed mohammad mahdavi3 1Isfahan- Isfahan university of technology- department of physics 2Isfahan University of Technology 3department of physic and Institute of nanotechnology, sharif university of technology |
| Abstract: |
| Optical properties of some materials change reversibly when exposed to hydrogen gas in the presence of a catalyst such as Pd or Pt. Different materials such as MoO3, V2O5 and WO3 have exhibited such phenomenon, called the gasochromic effect. Among the gasochromic materials, WO3 is the most interesting one because it better shows this effect. In this research, colloidal WO3/Pd core-shell nanoparticles were produced by a successive method including Pulsed Laser Ablation in Liquid (PLAL) followed by adding PdCl2 solution. X-ray Photoelectron Spectroscopy (XPS) was used to investigate the surface chemical composition of WO3 nanoparticles. XPS results showed that a long-term aging, the O:W ratio of nanoparticles is ~3. Optical transmittance of colloidal samples was carried out at different aging times including just after deposition, after 40, 80, 120 min and 24 h. The calculated optical band gap was found to be varied by aging time. Moreover, the shape of WO3 and core-shell WO3/Pd nanoparticles were determined by Transmission Electron Microscope (TEM). It was observed that when PdCl2 is added into the as-prepared WO3 core-shell structures are formed. In order to investigate the effect of PdCl2 concentration on particles size, several volume of PdCl2 were loaded into the colloidal WO3. Dynamic light scattering (DLS) showed that the average particles size increases exponentially with palladium content. |
| Keywords: |
| Gasochromic, Laser ablation, WO3, Nanoparticles |
| Status : Paper Accepted (Poster Presentation) |
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