Layer-by-layer assembly of thin organic films on PTFE activated by cold atmospheric plasma

• Authors: András Tóth , Klára Szentmihályi , Zsófia Keresztes , Imola Szigyártó , Dusan Kováčik , Mirko Černák , Kinga Kutasi
• Languages of publication: EN

Abstracts

EN

An air diffuse coplanar surface barrier discharge is used to activate the surface of polytetrafluoroethylene (PTFE) samples, which are subsequently coated with polyvinylpyrrolidone (PVP) and tannic acid (TAN) single, bi- and multilayers, respectively, using the dip-coating method. The surfaces are characterized by X-ray Photoelectron Spectroscopy (XPS), Attenuated Total Reflection – Fourier Transform Infrared Spectroscopy (ATR-FTIR) and Atomic Force Microscopy (AFM). The XPS measurements show that with plasma treatment the F/C atomic ratio in the PTFE surface decreases, due to the diminution of the concentration of CF2 moieties, and also oxygen incorporation through formation of new C–O, C=O and O=C–O bonds can be observed. In the case of coated samples, the new bonds indicated by XPS show the bonding between the organic layer and the surface, and thus the stability of layers, while the gradual decrease of the concentration of F atoms with the number of deposited layers proves the creation of PVP/TAN bi- and multi-layers. According to the ATR-FTIR spectra, in the case of PVP/TAN multilayer hydrogen bonding develops between the PVP and TAN, which assures the stability of the multilayer. The AFM lateral friction measurements show that the macromolecular layers homogeneously coat the plasma treated PTFE surface.

Keywords

EN

DCSBD plasma; Polytetrafluoroethylene surface; Polyvinylpyrrolidone and tannic acid layers; ATR-FTIR; XPS, AFM

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2015
• Volume: 13
• Issue: 1

Dates

received

12 - 2 - 2014

online

22 - 12 - 2014

accepted

7 - 5 - 2014

Contributors

author

András Tóth

• Research Centre for Natural Sciences of the Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Magyar tudósok körútja 2, H-1117 Budapest, Hungary

author

Klára Szentmihályi

• Research Centre for Natural Sciences of the Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Magyar tudósok körútja 2, H-1117 Budapest, Hungary

author

Zsófia Keresztes

• Research Centre for Natural Sciences of the Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Magyar tudósok körútja 2, H-1117 Budapest, Hungary

author

Imola Szigyártó

• Research Centre for Natural Sciences of the Hungarian Academy of Sciences, Institute of Materials and Environmental Chemistry, Magyar tudósok körútja 2, H-1117 Budapest, Hungary

author

Dusan Kováčik

• Masaryk University, R&D Center for Low-Cost Plasma and Nanotechnology Surface Modifications, Kotlářská 2, 611 37 Brno, Czech Republic

author

Mirko Černák

• Masaryk University, R&D Center for Low-Cost Plasma and Nanotechnology Surface Modifications, Kotlářská 2, 611 37 Brno, Czech Republic

author

Kinga Kutasi

• Wigner Research Centre for Physics of the Hungarian Academy of Sciences, Institute for Solid State Physics and Optics, Konkoly Thege M. út 29-33, H-1121 Budapest, Hungary

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Identifiers

DOI

10.1515/chem-2015-0072