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Gasochromic WO3 nanoparticles in liquid prepared by a simple anodizing method
Paper ID : 2333-UFGNSM13-FULL (R1)
Authors:
Abstract:
Hydrogen gas as a new renewable energy source has been vastly used in science and technology developments. In thin film form, WO3 have been greatly studied as a good candidate for H2 sensing. In the gasochromic phenomenon hydrogen incorporation into the WO3 after a catalyzing reaction with Pd changes its optical properties which are a very safe H2 detection approach. In this study, for the first time we developed a simple, cheap, mass productive and reliable method to produce gasochromic nanoparticle from anodizing commercial W rods. Then, palladium was loaded into the produced colloidal WO3 nanoparticles. The optical properties of the samples after hydrogen exposure revealed an interesting absorption mechanism in the near-IR regions which were explained by the small polaron model. Additionally, the effect of anodizing time on optical switching of Pd loaded WO3 samples was investigated. X-ray diffraction (XRD) of as-prepared, PdCl2 loaded with and without hydrogen exposure and as-prepared sample after annealing was carried out. The particle size obtained from Scherrer formula was about 35 nm. Additionally, FTIR analysis was used to realize the chemical states. X-ray photoelectron spectroscopy (XPS) used to investigate the surface chemical composition of the nanoparticles. We found a good correlation between different analysis results.
Keywords:
WO3, Anodizing, Nanoparticles, Gasochromic, XPS
Status : Paper Accepted (Poster Presentation)