Enhanced photocatalytic properties of corehell SiO sub(2)iO sub(2) nanoparticles

Here we report a very facile and reproducible method for the synthesis of CSNs with a control of particle morphology, crystallinity and phase selectivity, and provide important insight into the effect of corehell configuration on the photocatalytic and optical properties of SiO sub(2)iO sub(2) CSNs....

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2015-12, Vol.179, p.333-343
Main Authors: Ullah, Sajjad, Ferreira-Neto, Elias P, Pasa, Andre A, Alcantara, Carlos CJ, Acuna, Jose JS, Bilmes, Sara A, Martinez Ricci, Maria L, Landers, Richard, Fermino, Taina Zampieri, Rodrigues-Filho, Ubirajara P
Format: Article
Language:English
Subjects:
Dispersions
Morphology
Nanocrystals
Optical paths
Photocatalysis
Rayleigh scattering
Silicon dioxide
Synthesis
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Summary:Here we report a very facile and reproducible method for the synthesis of CSNs with a control of particle morphology, crystallinity and phase selectivity, and provide important insight into the effect of corehell configuration on the photocatalytic and optical properties of SiO sub(2)iO sub(2) CSNs. For this purpose, synthesis of highly dispersed anatase nanocrystals (~5 nm) of high surface area was carried out by supporting these nanocrystals on silica sub-micron spheres in the form of a porous shell of controlled thickness (10-30 nm). Both experimental data and theoretical simulations showed that due to the size of the complete particle (SiO sub(2)iO sub(2)), the general optical response of the system is regulated by Rayleigh scattering, exhibiting a red-shift of the extinction spectra as shell-thickness increases. The SiO sub(2)iO sub(2) configuration leads to efficient light harvesting by increasing the optical path inside the corehell particles.
ISSN:0926-3373
DOI:10.1016/j.apcatb.2015.05.036