8.5.5 Au Nanoparticles Dispersed Inside Porous TiO2 Thin Films: High Performance Optical Gas Sensors Through Localized Surface Plasmon Resonance Monitoring

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Colloidal solutions of Au and TiO2 nanoparticles are prepared and used as nanocrystal inks for the fabrication of porous thin films to be used as optical gas sensor. The introduction of Au nanoparticles in the TiO2 matrix affects the reactions mechanism improving the sensing process, moreover the Au Surface Plasmon Resonance peak can be used for the realization of a gas sensor with tunable sensitivity. The effect of thermal treatment, Au dimension and concentration is...