Surface characterization and radical decay studies of oxygen plasma-treated PMMA films

Date

2013-04-01

Author

Ozgen, Ozge
Aksoy, Eda Ayse
Hasırcı, Vasıf Nejat
Hasırcı, Nesrin

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

147
views

0
downloads

Polymethylmethacrylate (PMMA) films were modified by RF oxygen plasma with various powers applied for different periods, and the effects of these parameters on the surface properties such as hydrophilicity, surface free energy (SFE), chemistry, and topography were investigated by water contact angle, goniometer, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy, and the types of the created free radicals and their decay were detected by electron spin resonance spectroscopy (ESR). SFE and contact angle results varied depending on the plasma parameters. Oxygen plasma treatment (100 W-30 min) enhanced the hydrophilicity of PMMA surface as shown by decreasing the water contact angle from 70 degrees to 26 degrees. XPS analysis showed the change in the amounts of the present functionalities as well as formation of new groups as free carbonyl and carbonate groups. The roughness of the surface increased considerably from similar to 2 nm to similar to 75 nm after 100 W-30 min oxygen plasma treatment. ESR analysis indicated the introduction of peroxy radicals by oxygen plasma treatment, and the intensity of the radicals increased with increasing the applied power. Significant decrease in radical concentration was observed especially for the samples treated with higher powers when the samples were kept under the atmospheric conditions. As a conclusion, RF plasma, causes changes in the chemical and physical properties of the materials depending on the applied parameters, and can be used for the creation of specific groups or radicals to link or immobilize active molecules onto the surface of a material. Copyright (C) 2012 John Wiley & Sons, Ltd.

Subject Keywords

PMMA, Oxygen plasma treatment, Contact angle, SFE, XPS, ESR

URI

https://hdl.handle.net/11511/30307

Journal

SURFACE AND INTERFACE ANALYSIS

DOI

https://doi.org/10.1002/sia.5181

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Surface characterization of poly(L-lactic acid)-methoxy poly(ethylene glycol) diblock copolymers by static and dynamic contact angle measurements, FTIR, and ATR-FTIR Mert, Özenç Murat; ERBİL, HÜSNÜ YILDIRIM; Dernir, A. S. (2008-02-05) The surface composition and surface free energy properties of two types of amphiphilic and semicrystalline diblock copolymers consisting of poly(L-lactic acid) coupled to (methoxy poly(ethylene glycol) (PLLA-MePEG) having differing block lengths of PEG were investigated by using static and dynamic contact angle measurements, transmission Fourier infrared spectroscopy (FTIR), and attenuated total reflection spectroscopy (ATR-FTIR) and compared with results obtained from PLLA and MePEG homopolymers. The conta...
Surface-enhanced Raman scattering spectroscopy via gold nanostars Nalbant Esentürk, Emren (Wiley, 2009-01-01) Anisotropic metallic nanoparticles (NPs) have unique optical properties, which lend them to applications such as surface-enhanced Raman scattering (SERS) spectroscopy. Star-shaped gold (Au) NPs were prepared in aqueous solutions by the seed-mediated growth method and tested for Raman enhancement using 2-mercaptopyridine (2-MPy) and crystal violet (CV) probing molecules. For both molecules, the SERS activity of the nanostars was notably stronger than that of the spherical Au NPs of similar size. The Raman en...
Optical properties of Cu3In5S9 single crystals by spectroscopic ellipsometry Işık, Mehmet; Nasser, H.; Ahmedova, F.; Guseinov, A.; Hasanlı, Nızamı (2018-01-01) Cu3In5S9 single crystals were investigated by structural methods of x-ray diffraction and energy dispersive spectroscopy and optical techniques of ellipsometry and reflection carried out at room temperature. The spectral dependencies of optical constants; dielectric function, refractive index and extinction coefficient, were plotted in the range of 1.2-6.2 eV from ellipsometric data. The spectra of optical constants obtained from ellipsometry analyses and reflectance spectra presented a sharp change around ...
SURFACE TREATMENT OF POLYPROPYLENE USING A CAPACITIVELY COUPLED PLASMA SYSTEM Mecit, Giray; Yedierler, Burak; Department of Physics (2022-2-11) Gaseous plasmas are suitable for various applications in material science, including but not limited to thin film productions and coatings, tailoring the surface properties of polymers. This study aims to characterize a capacitively coupled plasma system utilized in material processing applications. The system utilizes a 13.56 MHz radio frequency source to produce gaseous plasmas. The correlation between the produced plasmas and the surface physical and surface chemical properties of polypropylene treated b...
Depth profile investigations of silicon nanocrystals formed in sapphire by ion implantation Yerci, Selçuk; Yıldız, İlker; BAROZZİ, MARİO; BERSANİ, MASSİMO; Turan, Raşit (2007-07-15) Depth profiles of Si nanocrystals formed in sapphire by ion implantation and the effect of charging during X-ray Photoelectron Spectroscopy (XPS) and Secondary Ion Mass Spectrometry (SIMS) measurements have been studied. Atomic concentration and the chemical environment of Si, Al, and O have been measured as a function of depth from the sample surface by SIMS and XPS. Both as-implanted and annealed samples have been analyzed to understand the effect of nanocrystal formation on the depth distribution, chemic...

Citation Formats

O. Ozgen, E. A. Aksoy, V. N. Hasırcı, and N. Hasırcı, “Surface characterization and radical decay studies of oxygen plasma-treated PMMA films,” SURFACE AND INTERFACE ANALYSIS, pp. 844–853, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30307.