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(a) TEM image: satellite Ag nanoparticles with average diameters of 5 nm around a spherical silica matrix formed so-called core–satellite SiO2-Ag nanoparticles. (b) Top-view SEM image of the core–satellite SiO2-Ag nanoparticles stacked on glass substrate. The inset is the cross-sectional SEM image.
(a) Melamine-concentration-dependent LSPR peak shifts for the liquid-type and solid-type SiO2@Ag nanosensors. (b) Differential plots derived from (a).
(a) Sketch of (i) classic Mie theory with mixture model, (ii) EMT model, and (iii) core-EML model constructed for the spectrum calculation of solid-state SiO2@Ag nanoparticles deposited on glass substrates. (b) Experimental and calculated absorption spectra of classic Mie theory with mixture model. (c) EMT of Ag and SiO2 nanoparticles model. (d) core–EML model for the SiO2@Ag nanoparticle film.
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