Iranian Research Organization for Science and Technology (IROST) Hydrogen, Fuel Cell & Energy Storage 2980-8537 4 2 2017 11 21 Hydrogen sensing by localized surface plasmon resonance in colloidal solutions of Au-WO3-Pd 119 124 557 10.22104/ijhfc.2017.2374.1149 EN Ameneh Farnood Department of Physics, Isfahan University of Technology, Isfahan, Iran Mehdi Ranjbar Department of Physics, Isfahan University of Technology, Isfahan, Iran Hadi Salamati Department of Physics, Isfahan University of Technology, Isfahan, Iran Journal Article 2017 08 02 Nowadays, hydrogen has attracted significant attention as a next generation clean energy source. Hydrogen is highly flammable, so detection of hydrogen gas is required. Gold nanoparticle based localized surface plasmon resonance (LSPR) is an advanced and powerful sensing technique, which is well known for its high sensitivity to surrounding refractive index change in the local environment. We put particular focus on how LSPR of gold nanoparticles can be used to sense hydrogen gas. Additionally, metal oxides are generally used as materials for high sensitivity and fast response H₂ sensors. Therefore, we used both an Au and WO₃ colloidal with a PdCl₂ solution added as a hydrogen catalyst. In this work, colloidal WO₃ nanoparticles were synthesized by an anodizing method and Au NPs were obtained by pulsed Nd:YAG laser ablation. The gold NPs showed a LSPR absorption band over the visible and near infrared region. When Au nanoparticles were added to the mixture of WO₃ and PdCl₂, the plasmon peak of Au nanoparticles shifted to a longer wavelength in the presence of hydrogen gas. Structural, morphological and optical properties of colloids were investigated by using a XRD, TEM and UV-Vis spectrophotometer, respectively.  https://hfe.irost.ir/article_557_54bf3099e72400bbc73a0cf662af2ef5.pdf