Thickness control of the silica shell: a way to tune the plasmonic properties of isolated and assembled gold nanorods
Source abstract
Abstract
Abstract By combining photophysical measurements with transmission electron microscopy, we proved that the thickness of the silica shell around gold nanorods determines the position of the longitudinal plasmonic band when they are isolated in solution or assembled in solid. The silica thickness has been tuned by modulating the reaction time and the ratio between CTAB-coated gold nanorods and TEOS concentration, obtaining gold nanorods covered by a silica shell with a thickness varying from 3.5 to 24 nm. Considering this shell as a spacer between the gold cores, it is possible to modulate the coupling of the localized surface plasmon resonance (LSPR) of neighboring nanorods. Moreover, the comparison between the extinction spectra in solution and in solid, recorded from nanorods covered by silica shell with different thickness, can be used to estimate the inter-nanoparticles distance required for plasmon interaction. We found that LSPR coupling is effective when the distance between the gold cores is no more than 10 nm. When the distance is greater, the nanorods do not interact with each other.
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Research context
OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Plasmonic and Surface Plasmon Research · Nanocluster Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (43)
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