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Evaluation of the Mechanism of the Gold Cluster Growth during Heating of the Composite Gold-Polytetrafluoroethylene Thin Film

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ABSTRACT

Nanocomposite films consisting of gold inclusions in the polytetrafluoroethylene (PTFE) matrix were obtained by thermal vacuum deposition. Annealing of the obtained films with different temperatures was used to measure varying of film morphologies. The dependence of optical properties of the films on their morphology was studied. It was established that absorption and profile of the nanocomposite film obtained by thermal vacuum deposition can be changed with annealing owing to the fact that different annealing temperatures lead to different average particle sizes. A method to calculate the optical properties of nanocomposite thin films with inclusions of different sizes was proposed. Thus, comparison of experimental optical spectra with the spectra obtained during the simulation enables estimating average sizes of inclusions. The calculations give the possibility of understanding morphological changes in the structures.

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The dependence between particle size and annealing temperature. Experimental and theoretical dependence is shown for Au-PTFE film with different Au concentration (Samples 1–3).
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nanomaterials-02-00366-f008: The dependence between particle size and annealing temperature. Experimental and theoretical dependence is shown for Au-PTFE film with different Au concentration (Samples 1–3).

Mentions: Transmission spectra have been calculated in conformity with the absorption spectra. The absorption spectra of thin Au-PTFE film 2 calculated with different sizes of particles are represented in Figure 7. At this figure the experimental adsorption spectra are shown, as well. We can see that modeling absorption profiles show similar results with the ones obtained experimentally. As one can see, the different dimensions of inclusions lead to shifting of the spectra maximum. Corresponding to the shifting value, sizes of particles were represented during the annealing process (Figure 8).


Evaluation of the Mechanism of the Gold Cluster Growth during Heating of the Composite Gold-Polytetrafluoroethylene Thin Film
The dependence between particle size and annealing temperature. Experimental and theoretical dependence is shown for Au-PTFE film with different Au concentration (Samples 1–3).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5304598&req=5

nanomaterials-02-00366-f008: The dependence between particle size and annealing temperature. Experimental and theoretical dependence is shown for Au-PTFE film with different Au concentration (Samples 1–3).
Mentions: Transmission spectra have been calculated in conformity with the absorption spectra. The absorption spectra of thin Au-PTFE film 2 calculated with different sizes of particles are represented in Figure 7. At this figure the experimental adsorption spectra are shown, as well. We can see that modeling absorption profiles show similar results with the ones obtained experimentally. As one can see, the different dimensions of inclusions lead to shifting of the spectra maximum. Corresponding to the shifting value, sizes of particles were represented during the annealing process (Figure 8).

View Article: PubMed Central - PubMed

ABSTRACT

Nanocomposite films consisting of gold inclusions in the polytetrafluoroethylene (PTFE) matrix were obtained by thermal vacuum deposition. Annealing of the obtained films with different temperatures was used to measure varying of film morphologies. The dependence of optical properties of the films on their morphology was studied. It was established that absorption and profile of the nanocomposite film obtained by thermal vacuum deposition can be changed with annealing owing to the fact that different annealing temperatures lead to different average particle sizes. A method to calculate the optical properties of nanocomposite thin films with inclusions of different sizes was proposed. Thus, comparison of experimental optical spectra with the spectra obtained during the simulation enables estimating average sizes of inclusions. The calculations give the possibility of understanding morphological changes in the structures.

No MeSH data available.


Related in: MedlinePlus