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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:27 |
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Conference: Bucharest University Faculty of Physics 2011 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Radiofrequency plasma polymerization of pentacyclic monomers
Authors:
V. Satulu (1), V. Ion (1), B. Mitu (1), G.V. Aldica (2), G. Dinescu (1)
Affiliation:
National Institute for Laser, Plasma and Radiation Physics, Magurele, 077125, Romania (1)
National Institute for Materials Physics, Magurele-Bucharest, 077125, Romania (1)
E-mail
veronica.satulu@infim.ro
Keywords:
plasma polymerization, conjugated monomers, thin films, polymer film characterization;
Abstract:
Plasma polymerization is an alternative technique to chemical polymerization as regarding the deposition of thin films with high transparency and good adherence onto various substrates. However, the main drawback in this case is related to the presence of many different reactive species (e.g., radicals, ions, electrons) in the plasma which dissociate the precursors and the exact chemical structure of the obtained materials is hard to predict.
This work reports on the plasma deposition of polymeric thin films in a parallel-plate electrode configuration starting from conjugated monomers, namely thiophene, furan and pyrrole. The RF discharge (13.56 MHz) is generated in a mixture of argon carrier gas and thiophene, furan or pyrrole vapors introduced in the chamber through a shower built electrode, while the substrate is placed on the grounded electrode. Subsequent grafting of iodine has been performed to the as- deposited polymeric thin films in order to improve the material conductivity.
The plasma characterization by optical emission spectroscopy and mass spectrometry techniques showed the presence of various radiative or non-radiative species in the deposition environment.
The material investigation by AFM, spectroscopic ellipsometry and FTIR spectroscopy techniques showed that very smooth and highly transparent films with partial conservation of the initial monomers structure were obtained.
The electrical characteristics have been studied by van der Pauw method: the electrical conductivity of the obtained materials was significantly improved upon iodine doping in the case of polythiophene and polypyrrole-like films, while an opposite behavior was observed for the polyfuran-like films.
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