Plasma polymers in the nanostructured and nanocomposite coatings

Název prace: Plazmové polymery v nanostrukturovaných a nanokompozitních vrstvách Autor: Artem Shelemin Katedra: Katedra makromolekulárni fyziky Vedoucí doktorské práce: Prof. RNDr. Hynek Biederman, DrSc. Abstract: V této práci jsou shrnuty výsledky dosažené b hem mého studia nanostrukturovaných a nanokompozitních vrstev plazmových polymer . Bylo vyvinuto a studováno n kolik alternativních experimentálních postup , které využívají plazmové technologie jak za sníženého tlaku (plynové agrega ní zdroje, depozice pod velkým úhlem), tak i za atmosférického tlaku (dielektrický bariérový výboj a plazmová tryska). V rámci práce byly p ipravovány nano ástice kov a oxid kov Ti/TiOx a AlOx i nano ástice plazmových polymer SiO-x(CH) a Nylon 6,6. Byla provedena podrobná charakterizace morfologie p ipravovaných povlak pomocí metod AFM a SEM i jejich chemického složení, které bylo studováno pomocí metod XPS a FTIR. Klí ová slova: plazmový polymer, nano ástice, tenká vrstva, nanostrukturyTitle: Plasma polymers in the nanostructured and nanocomposite coatings Author: Artem Shelemin Department / Institute: Department of the Macromolecular Physics Supervisor of the doctoral thesis: Prof. RNDr. Hynek Biederman, DrSc. Abstract: The thesis represents the main results of my research work aimed to study nanostructured and nanocomposite films of plasma polymer. A few alternative experimental approaches were developed and investigated which ranged from low pressure (gas aggregation cluster sources and glancing angle deposition) to atmospheric pressure (dielectric barrier discharge and plasma jet) plasma processing. The metal/metal oxide Ti/TiOx, AlOx and plasma polymer SiOx(CH), Nylon 6,6 nanoparticles were prepared. The analysis of morphology of deposited plasma polymer coatings was performed by AFM and SEM. The chemical composition of films was studied by XPS and FTIR. Keywords: plasma polymer, nanoparticle, thin film, nanostructuresKatedra makromolekulární fyzikyDepartment of Macromolecular PhysicsMatematicko-fyzikální fakultaFaculty of Mathematics and Physic

Plasma polymers in the nanostructured and nanocomposite coatings

Title: Plasma polymers in the nanostructured and nanocomposite coatings Author: Artem Shelemin Department / Institute: Department of the Macromolecular Physics Supervisor of the doctoral thesis: Prof. RNDr. Hynek Biederman, DrSc. Abstract: The thesis represents the main results of my research work aimed to study nanostructured and nanocomposite films of plasma polymer. A few alternative experimental approaches were developed and investigated which ranged from low pressure (gas aggregation cluster sources and glancing angle deposition) to atmospheric pressure (dielectric barrier discharge and plasma jet) plasma processing. The metal/metal oxide Ti/TiOx, AlOx and plasma polymer SiOx(CH), Nylon 6,6 nanoparticles were prepared. The analysis of morphology of deposited plasma polymer coatings was performed by AFM and SEM. The chemical composition of films was studied by XPS and FTIR. Keywords: plasma polymer, nanoparticle, thin film, nanostructure

Structure and Stability of C:H:O Plasma Polymer Films Co-Polymerized Using Dimethyl Carbonate

C:H:O plasma polymer films (PPFs) were deposited by means of plasma-enhanced chemical vapour deposition using the non-toxic, biodegradable organic compound dimethyl carbonate (DMC) at various plasma powers and pressures in order to control the degradation properties related to the carbonate ester group. Coating properties using pure DMC monomer vapours were compared to co-polymerized films from gaseous mixtures of DMC with either ethylene (C2H4) or carbon dioxide (CO2) affecting deposition rate and chemical composition. C:H:O film properties were found to depend primarily on the amount of oxygen in the plasma. To investigate the PPF stability during aging, changes in the composition and properties were studied during their storage both in air and in distilled water over extended periods up to 5 months. It was shown that aging of the films is mostly due to oxidation of the plasma polymer matrix yielding slow degradation and decomposition. The aging processes and their rate are dependent on the intrinsic amount of oxygen in the as-prepared C:H:O films which in turn depends on the experimental conditions and the working gas mixture. Adjustable film properties were mainly attained using a pure DMC plasma considering both gas phase and surface processes. It is thus possible to prepare C:H:O PPFs with controllable degradability both in air and in water

Degradable plasma polymer films with tailored hydrolysis behavior

Thin films based on polylactic acid have been prepared using plasma-assisted vacuum thermal deposition under varying RF glow discharge power and characterized in terms of chemical composition and structural homogeneity. As a measure of the degradability of the films their wash-off and hydrolysis behavior were monitored. The properties of the films were found to be tunable to a significant degree by the deposition conditions. © 2019 Elsevier LtdCzech Science FoundationGrant Agency of the Czech Republic [GA17-10813S

Plasma Polymerization on Mesoporous Surfaces: <i>n</i>‑Hexane on Titanium Nanoparticles

Plasma treatment of porous materials has huge potential in many applications where chemical modification of interior structure or its loading with polymeric matrices is required. Plasma polymers are often assumed to grow conformally on solid supports; however, their innate roughness may interfere with the surface topography at mesoscale. Here, model mesoporous coatings were prepared by deposition of titanium nanoparticles with the average size of 50 nm onto flat silicon substrates. The nanoparticles were fabricated by magnetron sputtering in the configuration of a gas aggregation source. The porous coatings were subsequently subjected to deposition of soft hydrocarbon plasma polymers from <i>n</i>-hexane. In the early stage of the deposition, negligible increase of thickness is observed as the plasma polymer fills the inner free space of the coatings. The topographical features expand in lateral dimension, but the RMS roughness does not change. In the late growth regime, the inner voids become filled and the plasma polymer grows on top of the coatings. The growth proceeds with preferential filling of the valleys between the surface asperities, thus leading to smoothening of the surface. The decrease of roughness is manifested in negative growth exponent. Equality between the absolute values of the local and global roughness exponent evidences about self-affine growth dynamics. Nevertheless, the set of the critical exponents (the growth exponent β = −0.16, the dynamic exponent 1/<i>z</i> = 0.16, the roughness exponent |α| = 1.0) indicates that the deposition does not match any of universality classes of local growth. Local diffusion coupled with nonlocal mass transport due to re-emission of the incoming species can explain the kinetic smoothening observed. The technology allows for fabrication of mesoporous coatings with precisely adjustable pore size or straightforward production of nanocomposite thin films with nanoparticles homogeneously embedded in the matrix of plasma polymer