Abstract
The fundamental gas-sorption properties of sputtered polymeric films (fluoropolymer and amino acid films) are clarified using a quartz crystal resonator as a film substrate of a piezoelectric mass transducer. X-ray photoelectron spectroscopy suggests that the surface molecular structure of the fluoropolymer film does not change after the sorption of oxygen and fluorocarbon gases. Sorption measurements in a vacuum chamber show that the fluoropolymer film completely releases the residual gas even at a low vacuum (8×10−2Torr) and softened by the increase of temperature, whereas, the d-phenylalanine film does not completely emit the sorbed gas even at a high vacuum (5.5×10−7Torr). The fluoropolymer film retains its solvent characteristics without changing its mechanical properties for non-polar organic gases under saturated vapor conditions; however, damping occurs in polar organic gases along with bond formation. The concentration-dependence of sorption capacities for chlorinated ethylenes and benzene derivatives classifies the amino acid film as a polar solvent or the PCTFE film as a non-polar solvent.
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