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Production and photoactivity spectrum of Ni/TiO2 core shell nanoparticles
Coutinho, Paulo J. G.; Peixoto, Bruno; Kabir, R.; Schellenberg, PeterIn this work, Ni nanoparticles were obtained by laser ablation of a Nickel target with femtosecond pulses from a Ti-Sapphire laser in an aqueous media. Subsequently, these nanoparticles were isolated and covered with TiO2.
Tuning of the surface plasmon resonance in TiO2/Au thin films grown by magnetro...
Torrell, M.; Kabir, R.; Cunha, L.; Vasilevskiy, Mikhail; Vaz, F.; Cavaleiro, A.; Alves, E.; Barradas, N. P.Nanocomposites consisting of a dielectric matrix, such as TiO2, with embedded noble metal nanoparticles (NPs) possess specific optical properties due to the surface plasmon resonance (SPR) effect, interesting for several applications. The aim of this work is to demonstrate that these properties are sensitive to the nanostructure of magnetron-sputtered TiO2/Au thin films, which can be tuned by annealing. We stud...
Nanoscale color control of TiO2 films with embedded Au nanoparticles
Torrell, M.; Cunha, L.; Kabir, R.; Cavaleiro, A.; Vasilevskiy, Mikhail; Vaz, F.Article in press ; We demonstrate an efficient nanoscale control of the optical properties of TiO2 films by tuning the Surface Plasmon Resonance (SPR) in the embedded Au nanoparticles. The films were grown by reactive magnetron sputtering. SPR tuning was achieved by different annealings, which affected the shape and size of the Au nanoparticles, and also the phase of the dielectric matrix. These changes promot...
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