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Revealing the nanoparticles aspect ratio in the glass-metal nanocomposites irradiated with femtosecond laser.

Chervinskii S, Drevinskas R, Karpov DV, Beresna M, Lipovskii AA, Svirko YP, Kazansky PG - Sci Rep (2015)

Bottom Line: Comparing experimental absorption spectra with the modeling based on Maxwell Garnett approximation modified for spheroidal inclusions, we obtained the mean aspect ratio of the re-shaped silver nanoparticles as a function of the laser fluence.We demonstrated that under our experimental conditions the spherical shape of silver nanoparticles changed to a prolate spheroid with the aspect ratio as high as 3.5 at the laser fluence of 0.6 J/cm2.The developed approach can be employed to control the anisotropy of the glass-metal composites.

View Article: PubMed Central - PubMed

Affiliation: Institute of Photonics, University of Eastern Finland, P.O.Box 111 Joensuu, FI-80101 Finland.

ABSTRACT
We studied a femtosecond laser shaping of silver nanoparticles embedded in soda-lime glass. Comparing experimental absorption spectra with the modeling based on Maxwell Garnett approximation modified for spheroidal inclusions, we obtained the mean aspect ratio of the re-shaped silver nanoparticles as a function of the laser fluence. We demonstrated that under our experimental conditions the spherical shape of silver nanoparticles changed to a prolate spheroid with the aspect ratio as high as 3.5 at the laser fluence of 0.6 J/cm2. The developed approach can be employed to control the anisotropy of the glass-metal composites.

No MeSH data available.


Related in: MedlinePlus

Aspect ratio, c/a, of prolate silver spheroids as a function of the modification laser fluence.The relation between the peaks of differential optical density and the aspect ratio of spheroids were extracted from the processed transmission spectra partly shown in Figs 3 and 6(b). The inset schematically show nanoparticles shape and location inside the laser irradiated sample.
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f7: Aspect ratio, c/a, of prolate silver spheroids as a function of the modification laser fluence.The relation between the peaks of differential optical density and the aspect ratio of spheroids were extracted from the processed transmission spectra partly shown in Figs 3 and 6(b). The inset schematically show nanoparticles shape and location inside the laser irradiated sample.

Mentions: The fitting of the experimental spectra shown in Fig. 6(b) allows us to obtain the aspect ratio of reshaped particles as a function of the fluence of the processing laser beam (Fig. 7). By comparing Figs 4 and 7, one can conclude that is a nearly linear function of the aspect ratio the same way as for isolated spheroids in Fig. 5. In our experimental conditions, this function takes the following form: λSPR[nm] ≈ 145(c/a) + 275 nm. This is in a good agreement with the estimations made for the isolated spheroids26.


Revealing the nanoparticles aspect ratio in the glass-metal nanocomposites irradiated with femtosecond laser.

Chervinskii S, Drevinskas R, Karpov DV, Beresna M, Lipovskii AA, Svirko YP, Kazansky PG - Sci Rep (2015)

Aspect ratio, c/a, of prolate silver spheroids as a function of the modification laser fluence.The relation between the peaks of differential optical density and the aspect ratio of spheroids were extracted from the processed transmission spectra partly shown in Figs 3 and 6(b). The inset schematically show nanoparticles shape and location inside the laser irradiated sample.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4562248&req=5

f7: Aspect ratio, c/a, of prolate silver spheroids as a function of the modification laser fluence.The relation between the peaks of differential optical density and the aspect ratio of spheroids were extracted from the processed transmission spectra partly shown in Figs 3 and 6(b). The inset schematically show nanoparticles shape and location inside the laser irradiated sample.
Mentions: The fitting of the experimental spectra shown in Fig. 6(b) allows us to obtain the aspect ratio of reshaped particles as a function of the fluence of the processing laser beam (Fig. 7). By comparing Figs 4 and 7, one can conclude that is a nearly linear function of the aspect ratio the same way as for isolated spheroids in Fig. 5. In our experimental conditions, this function takes the following form: λSPR[nm] ≈ 145(c/a) + 275 nm. This is in a good agreement with the estimations made for the isolated spheroids26.

Bottom Line: Comparing experimental absorption spectra with the modeling based on Maxwell Garnett approximation modified for spheroidal inclusions, we obtained the mean aspect ratio of the re-shaped silver nanoparticles as a function of the laser fluence.We demonstrated that under our experimental conditions the spherical shape of silver nanoparticles changed to a prolate spheroid with the aspect ratio as high as 3.5 at the laser fluence of 0.6 J/cm2.The developed approach can be employed to control the anisotropy of the glass-metal composites.

View Article: PubMed Central - PubMed

Affiliation: Institute of Photonics, University of Eastern Finland, P.O.Box 111 Joensuu, FI-80101 Finland.

ABSTRACT
We studied a femtosecond laser shaping of silver nanoparticles embedded in soda-lime glass. Comparing experimental absorption spectra with the modeling based on Maxwell Garnett approximation modified for spheroidal inclusions, we obtained the mean aspect ratio of the re-shaped silver nanoparticles as a function of the laser fluence. We demonstrated that under our experimental conditions the spherical shape of silver nanoparticles changed to a prolate spheroid with the aspect ratio as high as 3.5 at the laser fluence of 0.6 J/cm2. The developed approach can be employed to control the anisotropy of the glass-metal composites.

No MeSH data available.


Related in: MedlinePlus