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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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Transmission electron microscope (TEM) images of the Au-filled PTFE films. Au concentration increases from 1 to 2, from 5 to 21 vol %. Magnification 100,000.
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nanomaterials-02-00366-f002: Transmission electron microscope (TEM) images of the Au-filled PTFE films. Au concentration increases from 1 to 2, from 5 to 21 vol %. Magnification 100,000.

Mentions: The Au-filled PTFE films were deposited onto glass and quartz slides with Au concentration ranging from ~5 to 21 vol %. Depending on Au concentration, the film transmissions ranged from 70% to 30%. Deposition rate was in the range of 6–20 nm/min, and film thickness was in the range of 50–100 nm. The maximum of the absorption profile position for a final film was shifted from 510 to 550 nm with the increase of Au concentration. TEM investigations show that Au cluster size was defined by Au Figure concentration. The TEM images of the films with different Au concentration are presented in Figure 2.


Evaluation of the Mechanism of the Gold Cluster Growth during Heating of the Composite Gold-Polytetrafluoroethylene Thin Film
Transmission electron microscope (TEM) images of the Au-filled PTFE films. Au concentration increases from 1 to 2, from 5 to 21 vol %. Magnification 100,000.
© Copyright Policy
Related In: Results  -  Collection

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

nanomaterials-02-00366-f002: Transmission electron microscope (TEM) images of the Au-filled PTFE films. Au concentration increases from 1 to 2, from 5 to 21 vol %. Magnification 100,000.
Mentions: The Au-filled PTFE films were deposited onto glass and quartz slides with Au concentration ranging from ~5 to 21 vol %. Depending on Au concentration, the film transmissions ranged from 70% to 30%. Deposition rate was in the range of 6–20 nm/min, and film thickness was in the range of 50–100 nm. The maximum of the absorption profile position for a final film was shifted from 510 to 550 nm with the increase of Au concentration. TEM investigations show that Au cluster size was defined by Au Figure concentration. The TEM images of the films with different Au concentration are presented in Figure 2.

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