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Particle Size and Shell Thickness Dependence of the Light Intensity Enhancement in the Cap Layers of Ag, Au, Al and SiO 2 @TiO 2 Core‐Shell Nanostructures
Author(s) -
Bascura Erdem B.,
Karakurt Ismail
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201703037
Subject(s) - materials science , nanoparticle , shell (structure) , intensity (physics) , particle (ecology) , nanostructure , range (aeronautics) , particle size , core (optical fiber) , nanotechnology , analytical chemistry (journal) , optics , composite material , chemical engineering , chemistry , physics , oceanography , geology , engineering , chromatography
We present a systematic study of the light intensity enhancement in the shell layers of half burrried Ag, Au, Al and SiO 2 spherical nanoparticles capped with TiO 2 . We calculated the light intensity profiles near these structures when they are illuminated by a UV light at 380 nm. The calculations cover the particle‐size range between 20 and 180 nm, and the cap thickness range between 6 and 80 nm. Our data is the first report on the intensity enhancement in the shell layers of TiO 2 ‐capped Al nanoparticles and Al@TiO 2 core‐shell nanostructures. We obtain, in the cap layers, an average intensity enhancement of ∼3.7, ∼6.1, ∼2.4 and ∼2.7 for a cap thickness of ∼30 nm above Ag, Al, Au and SiO 2 particles. Taking into account the increase in the active surface area, these numbers can be multiplied by a factor of two, for each capped‐nanoparticle system. The optimal Ag, Au, Al and SiO 2 ‐particle sizes for a 30‐nm cap‐thickness are found to be 120 nm, 80 nm, 140 nm, and 80 nm. While half‐buried and capped‐nanoparticle systems resemble the typical core‐shell nanoparticles, the intensity enhancements are not equivalent. We compare the intensity increases in these two systems at the optimal sizes for Ag and Al particles for a 30‐nm shell thickness.