Optical and Mechanical Properties of Thin PTFE Films, Deposited from a Gas Phase

Grytsenko, K.; Kolomzarov, Yurii; Lytvyn, Peter; Кондратенко, О. С.; Sopinskyy, M. V.; Lebedyeva, I. V.; Niemczyk, Agata; Baranovska, Jolanta; Moszyński, Dariusz; Villringer, Claus; Schrader, Sigurd

doi:10.1002/mame.202200617

Cited by 3 publications

(1 citation statement)

References 63 publications

(110 reference statements)

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“…Details of the PTFE deposition could be found elsewhere. [42,52,61] The pieces of polycarbonate DVD disk made by OTB Engineering were used. The bare surface of a disc had a regular nanotopography (grooves 180 nm in depth and period of 740 nm).…”

Section: Methodsmentioning

confidence: 99%

Electron‐Assisted Deposition‐Polymerization in Vacuum of Polymethines with Terminal Allyl Group

Grytsenko,

Doroshenko,

Kolomzarov

et al. 2023

Macro Materials & Eng

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Polymethines containing an allyl group have been synthesized. Their films are produced by physical vapor deposition (PVD) on glass, silicon (Si), gold (Au), polytetrafluoroethylene (PTFE), and nanostructured plastic substrates. Optical spectra recorded during the deposition showed no decomposition of molecules. The influence of dye structure and substrate on the morphology of the deposits is studied using atomic force microscopy (AFM). Depending on the dye structure and the substrate material, various nanostructures are grown. Dichroic nanowires (NWs) are formed by self‐assembly on Au and Si substrates. On the Si surface, NWs grow between the edges of neighboring Au stripes. Several methods are used for the selective opening of the allyl group. Smooth films are produced with optical spectra similar to those deposited by PVD. The morphology of the films is dependent on the activation conditions. The thermal stability of the films exceeds the stability of those deposited via PVD.

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Section: Methodsmentioning

confidence: 99%

Electron‐Assisted Deposition‐Polymerization in Vacuum of Polymethines with Terminal Allyl Group

Grytsenko,

Doroshenko,

Kolomzarov

et al. 2023

Macro Materials & Eng

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Determination of scattering and Urbach absorption contributions to the light extinction in PTFE films by using graphical representation technique and numerical solution of the inverse problem

Sopinskyy,

Grytsenko,

Villringer

et al. 2023

SPQEO

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Ellipsometrically obtained spectral dependences of ordinary αxy and extra-ordinary αz extinction/attenuation coefficients within the spectral range λ = 300…980 nm of uniaxially anisotropic polytetrafluoroethylene (PTFE) films were analyzed. We considered the capabilities and specific features of the graphical representation technique for determining the contribution of Rayleigh scattering and Urbach absorption to light attenuation in the spectral range beyond fundamental absorption. It has been shown that the graphical approach enables to estimate these contributions qualitatively, semi-quantitatively or quantitatively, depending on the situation. The conclusions made using the analysis of graphical representation are confirmed by numerical solution of the inverse problem via simulation of the αxy (λ), αz (λ) experimental dependences within the framework of a best-fit procedure. Being based on both of these approaches, we have ascertained that, in the as-prepared PTFE films, the so-called anomalous light scattering (ALS) with the spectral dependence of scattering coefficient αs ≈ as λ–p (p > 4) takes place. Transformation of scattering from ALS to the Rayleigh one with p ≈ 4 due to annealing is accompanied by an increase of Urbach (subband) absorption. Both of these factors cause narrowing the dynamic range of extinction coefficient values. Both scattering and absorption coefficients are higher for the component of light polarized along the normal to the substrate as compared to the component polarized in parallel to it. The relationship between observed behavior of the scattering and absorption coefficients and the film structure has been discussed.

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Rubber-like PTFE Thin Coatings Deposited by Pulsed Electron Beam Deposition (PED) Method

Niemczyk,

Jędrzejewski,

Piwowarczyk

et al. 2024

Polymers

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PTFE coatings were manufactured using the pulsed electron beam deposition (PED) technique and deposited on Si substrates. The deposition was carried out at constant parameters: temperature 24 °C, discharge voltages 12 kV, and 5000 electron pulses with a pulse frequency of 5 Hz. Nitrogen was used as the background gas. The gas pressure varied from 3 to 11 mTorr. The coating adhesion was evaluated using micro scratch testing and the residual scratch morphology was characterized by atomic force microscopy. Detailed studies of the chemical and physical structure were conducted using infrared spectroscopy and X-ray diffraction. These analyses were then correlated with the mechanical response of the coatings observed during the scratch tests. Drawing upon a review of the literature concerning energetic beam interactions with PTFE material, hypotheses were posed to explain why only specific conditions of the PED process yielded PTFE coatings with rubber-like properties.

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Optical and Mechanical Properties of Thin PTFE Films, Deposited from a Gas Phase

Cited by 3 publications

References 63 publications

Electron‐Assisted Deposition‐Polymerization in Vacuum of Polymethines with Terminal Allyl Group

Electron‐Assisted Deposition‐Polymerization in Vacuum of Polymethines with Terminal Allyl Group

Determination of scattering and Urbach absorption contributions to the light extinction in PTFE films by using graphical representation technique and numerical solution of the inverse problem

Rubber-like PTFE Thin Coatings Deposited by Pulsed Electron Beam Deposition (PED) Method

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