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Environmental Optical Sensitivity of Gold Nanodecahedra
Author(s) -
Pastoriza–Santos I.,
Sánchez–Iglesias A.,
García de Abajo F. J.,
Liz–Marzán L. M.
Publication year - 2007
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200601071
Subject(s) - materials science , refractive index , monolayer , biosensor , sensitivity (control systems) , surface plasmon resonance , plasmon , dimethylformamide , optics , analytical chemistry (journal) , nanotechnology , optoelectronics , nanoparticle , solvent , organic chemistry , physics , chemistry , electronic engineering , engineering
The sensitivity of localized surface plasmon resonances with respect to changes in the refractive index of the surrounding medium is measured for small (< 60 nm side length) and large (ca. 150 nm side length) regular gold nanodecahedra (pentagonal bipyramids), and compared to rigorous solutions of Maxwell's equations for bicones based upon the boundary element method (BEM). Small particles are prepared through ultrasound‐induced reduction of HAuCl 4 by N , N ‐dimethylformamide (DMF) on presynthesized penta‐twinned Au seeds, whereas large decahedra are grown using smaller ones as seeds. Excellent agreement between experimental and calculated spectra is found for dispersions and monolayers of particles in different solvents, as well as for the effect of uniform silica layers of various thicknesses grown on them. These results are expected to be useful for the development of novel biosensors.