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Absorption spectra of colloidal nanoparticles. Curve I shows the Ag colloid formed after laser ablation of the Ag plate for . Curves II–VI, the laser ablation to the Au plates in product I for 30, 60, 90, 120, and , respectively.
Ultrahigh-resolution TEM images of colloid III.
(a) SEM images of the nanoparticles in the product III. (b) Electron energy spectrum for the area in (a).
Absorption spectra of nanoparticle colloids of (a) the mixed Ag and Au colloid; (b) the Ag colloid the same as I in Fig. 1; (c) further laser irradiated for and (d) for .
Absorption spectra of Ag core/Au shell nanoparticles calculated by computer simulation based on Mie theory. The diameter of Ag core is . The thicknesses of the Au shell are 1, 2, 6, 10, 25, and , respectively.
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