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Typical HRTEM images of the as-prepared (a), (b), 6 h heat-treated (c), (d), and 16 h heat-treated (e), (f) Ag-doped glass samples; dark contrast features in the bulk of the glasses are the Ag particles; (g) electron diffraction pattern taken on the 6 h heat-treated sample; the diffuse diffraction rings are typical for an amorphous material; (h) histogram of size distribution of the Ag particles: green columns, as-prepared glass sample: magenta columns, 6 h heat-treated; blue columns, 16 h heat-treated glass samples; the average size is 1.1 nm for the as-prepared, 2.3 nm for the 6 h heat-treated glass samples, while the 16 h heat-treated sample shows a bimodal distribution with a substantial amount of ∼10–15 nm particles.
TEM EDX spectrum of the as-prepared Ag doped glass sample. The region containing the Ag K-lines around 22 and 25 keV is shown in more detail as an inset.
Absorbance spectra of the Ag dopants dispersed in the as-prepared Ag-doped glass (black curve) and heat-treated Ag-doped glasses (colored curves). The light and dark green curves show Mie theory calculated plasmon absorption peaks for Ag metal nanoparticles of 1.1 (light) and 2.3 (dark) nm diameter in arbitrary units;
Emission (a) and excitation (b) luminescence spectra of the as-prepared and heat treated Ag-doped glasses; glass labels, detection and excitation wavelengths are post-signed, respectively. An inset in (a) shows the integrated intensities of the emission bands excited at 350 (black dots and curves), 400 (blue dots and curves), and 450 (red dots and curves) nm; the respective color lines are guides to the eye.
Plasmon absorption spectrum of Ag doped glass heat-treated during 16 h (grey curve, right Y-axis) and its fits by Mie theory (dashed curve, left Y-axis) and FDTD simulation (color curves, left Y-axis), which correspond to Ag-nanoparticles with a diameter of 2.3 nm. The FDTD fitting parameters are post-signed in inset, where G stands for an inter-particle distance while a damping rate is 3×.
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