Modification of PET Foil by 150 keV Li+ Ion Implantation |
| M. Turek, A. Droździel, K. Pyszniak, W. Grudziński
Institute of Physics, Maria Curie Sklodowska University in Lublin, Pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland |
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| Very thin (3 μm in thickness) polyethylene terephthalate polymer foils were implanted with 150 keV Li+ with fluences in the range from 1×1014 cm-2 up to 2×1016 cm-2. Modification of the irradiated polymer microstructure was studied with the Fourier transform infrared spectroscopy and Raman spectroscopy. Breaking of a variety of chemical bonds followed by the formation of carbon clusters made of sp2 C was proved. The dominance of the rings in the carbonized, graphite-like subsurface layer is demonstrated based on the fact that the G band prevails in the Raman spectra for larger Li+ fluences. The rise of the absorbance within 200-800 nm is observed. Tauc's plots analysis enables the estimation of optical bandgap values that decrease from 3.95 eV (pristine polyethylene terephthalate) down to 1.4 eV (fluence of 2×1016 cm-2). This change is not as dramatic as in the case of heavier projectiles like K+ or Na+. Reduction of surface resistivity by more than 2 orders of magnitude is observed in the case of the sample irradiated with the fluence 1×1016 cm-2, and this effect is much smaller than that induced by the heavier projectile bombardment with the same fluence. |
DOI:10.12693/APhysPolA.142.753 topics: polymers modification, ion implantation, polyethylene terephthalate (PET) |