Enhancing carrier generation in TiO2 by a synergistic effect between plasmon resonance in Ag nanoparticles and optical interference

Enhancing carrier generation in TiO2 by a synergistic effect between plasmon resonance in Ag nanoparticles and optical interference

Silver nanoparticles have been embedded at a few nanometer distance from the free surface of titania/silica multilayers using low energy ion beam synthesis. Transmission electron microscopy shows the presence of 3 nm-sized crystalline particles. Reflectance spectroscopy on these composite substrates...

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Veröffentlicht in:Nanoscale 2015-08, Vol.7 (32), p.13468-13476
Hauptverfasser: Cacciato, Giuseppe, Bayle, Maxime, Pugliara, Alessandro, Bonafos, Caroline, Zimbone, Massimo, Privitera, Vittorio, Grimaldi, Maria Grazia, Carles, Robert
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container_end_page 13476
container_issue 32
container_start_page 13468
container_title Nanoscale
container_volume 7
creator Cacciato, Giuseppe
Bayle, Maxime
Pugliara, Alessandro
Bonafos, Caroline
Zimbone, Massimo
Privitera, Vittorio
Grimaldi, Maria Grazia
Carles, Robert
description Silver nanoparticles have been embedded at a few nanometer distance from the free surface of titania/silica multilayers using low energy ion beam synthesis. Transmission electron microscopy shows the presence of 3 nm-sized crystalline particles. Reflectance spectroscopy on these composite substrates shows an increase of the light capture efficiency in the visible range. This behaviour is interpreted as a synergistic effect between plasmon polariton resonance and Fabry-Perot interferences. Plasmon-resonant Raman spectroscopy is deeply used to analyze, on one hand confinement of vibrations and electronic excitations in Ag NPs, and on the other hand coupling of polar TiO2 phonons with injected photo-generated carriers. It is shown how these new Ag/TiO2 nanocomposite films appear as very promising to enhance the efficiency and enlarge the spectral sensitivity of plasmo-electronics devices.
doi_str_mv 10.1039/c5nr02406d
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title Enhancing carrier generation in TiO2 by a synergistic effect between plasmon resonance in Ag nanoparticles and optical interference
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