Abstract
Investigation of sorption capacities for volatile organic compounds of radio-frequency-sputtered fluoropolymer films has revealed that they are affected by the applied voltage and by supplemental photo-excitation using ultraviolet light irradiation during sputtering. The photo-assisted effects of producing unsaturated carbons on the sputtered tetrafluoroethylene film are revealed by infrared, electron spin resonance, and X-ray photoelectron spectroscopies. Measurements of sorption capacities and computational chemical calculation for six-membered cyclic hydrocarbons revealed that the π-character of the solute molecule is a decisive molecular descriptor for sorption behavior of the sputtered fluoropolymers. The π-character of the sputtered fluoropolymer films can be enhanced by a photo-assisted effect, which can also increase the affinities for π-characterized solutes by π– π interaction. This is further clarified by the fact that the photo-assisted fluoropolymer film has a larger sorption capacity for highly π-conjugated double aromatic ring systems (C 10H 8): naphthalene than for slightly π-conjugated, but polar, isomer: azulene. It was also found that saturated organic vapor ( p-xylene and 2-butanone) sorption can enhance the sorption capacities of the sputtered fluoropolymer by restructuring induced by solvation and radical reaction.
Published Version
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