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Online monitoring of alloyed bimetallic nanoparticle formation by optical spectroscopy
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental TEM image and size histogram analysis of the prepared nanocomposite.

Image of FIG. 2.
FIG. 2.

Comparison of the experimental data (solid line) and simulated spectra (dashed line) for different gold relative contents : (a) , (b) , (c) , and (d) . Dielectric constant for the polymer matrix (Ref. 40); the rates of electron collisions for silver and gold are and ; silver and gold bulk plasma frequencies: and (Ref. 35).

Image of FIG. 3.
FIG. 3.

Radial distribution of a uniform Cb supersaturated atom solution.

Image of FIG. 4.
FIG. 4.

Normalized absorption spectra maxima values vs the time for two different kinetic mechanisms of particle growth: diffusion controlled, when the cluster radius increases as a square root of the reaction time (square-dot-dashed line), and deposition controlled, when the radius increases linearly in (triangle-dot-dashed line). These curves were obtained through the full Mie theory based spectral simulations for the Au nanoparticle ( and ) (Ref. 35). It is assumed that at the formation process stops and the nanoparticle has the same radii for both growth mechanisms.

Image of FIG. 5.
FIG. 5.

Absorption peak vs gold relative content inside the nanoparticle calculated by three different methods: (a) direct resonance maximum determination from the simulated absorption spectra (square and line), (b) with the use of Eq. (6) (rhombus and line), and (c) with the use of Eq. (7) (triangle and line).

Image of FIG. 6.
FIG. 6.

Experimentally obtained absorption peak position (-axis scale to the right, dashed lines) and calculated by these data gold relative content inside the nanoparticles (-axis scale to the left, solid lines) vs time of the nanoparticle formation process for three different gold relative contents into initial mixture: (1) , (2) , and (3) .

Image of FIG. 7.
FIG. 7.

Nanoparticle diameter squared vs reaction time for three different gold relative molar reactive mixture compositions : (1) (square and solid line), (2) (triangle and dashed line), and (3) (rhombus and dotted line). The diameter calculations were based on Eq. (12) and experimental data presented in Fig. 6.

Image of FIG. 8.
FIG. 8.

(a) Gold concentration behavior in growing nanoparticles for two different gold relative molar compositions in reactive mixture : (1) and (2) . (b) Radial distribution of the gold molecules relative content inferred from vs dependence from (a) for .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Online monitoring of alloyed bimetallic nanoparticle formation by optical spectroscopy