In this article we have studied the structure of Au-Pd core-shell nanoparticles, which is composed of a uniform Au inner core surrounded by Pd nanoparticles. This is done to a new ultrasensitive sensor with height performance characteristics, low-cost fabrication process for hydrogen detection. Hydrogen cannot be used like any other gas because of its explosive behavior at 4% concentration in the air and, to avoid any risk we need to control its concentration permanently. The Au– Pd core-shell nanoparticles (NPs) were synthesized according to a multi-reduction step method. The morphology, density, size, and structure of these nanoparticles can be controlled by the synthesis conditions. They were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The impact of Pd shell on the surface plasmon resonance (SPR) was investigated by finite difference time domain simulations (FDTD) and the absorption spectroscopy under different hydrogen concentrations ranging from 1% to 4%. We noticed a change in the optical behaviour and a shift of the SPR peak of our Au-Pd core-shell system towards the lowest wavelengths from the first hydrogenation dehydrogenation cycle.
We present an original preliminary study dedicated to innovative pollutant plasmonic sensors exploiting the interaction properties between light and original nanostructured carbon based materials, in order to bring a real breakthrough in performance in terms of detection limit, quantification and sensitivity. The detection of our pesticide is based on the variation of the optical properties of the materials used in the presence of the molecule to be detected. We propose two ways of investigation that are i) the Surface Plasmon Resonance detection (SPR) in Kretschmann configuration and ii) the use of an original functionalized nano structured organization based on the use of functionalized gold nanoparticles with carbon materials.
The detection of micro pollutants by new innovative systems is one of the important issues of our society. This study is dedicated to innovative pollutant sensors exploiting the interaction properties between light and original nanostructured materials, in order to create a real jump in performance in terms of detection limit, quantification and sensitivity. The detection of our pesticide is based on the variation of the optical properties of the materials used in the presence of the molecule to be detected. We propose two ways of investigation that are (i) the Surface Plasmon Resonance detection (SPR) in Kretschmann configuration and (2) the use of an original functionalized nano structured organization based on the use of functionalized gold nanoparticles.
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