Network Properties of Ureasil-Based Polymer Matrixes for Construction of Amperometric Biosensors as Probed by PALS and Swelling Experiments
T. Kavetskyya,b, O. Šauša c, K. Čechová c, H. Švajdlenková d, I. Mat'ko c, T. Petkova e, V. Boev e, V. Ilcheva e, O. Smutok f, Y. Kukhazh b and M. Gonchar f
aThe John Paul II Catholic University of Lublin, Al. Racławickie 14, 20-950 Lublin, Poland
bDrohobych Ivan Franko State Pedagogical University, I. Franko Str. 24, 82100 Drohobych, Ukraine
cInstitute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovak Republic
dPolymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovak Republic
eInstitute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 10, 1113 Sofia, Bulgaria
fInstitute of Cell Biology, National Academy of Sciences of Ukraine, Drahomanov Str. 14/16, 79005 Lviv, Ukraine
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Network properties of ureasil-based polymer matrixes suitable for construction of amperometric biosensors were probed by positron annihilation lifetime spectroscopy and swelling experiments. Temperature dependences of the ortho-positronium (o-Ps) lifetimes and their relative intensities were measured in a temperature range of 15-350 K. Glass transition temperatures and expansion coefficients of microscopical free-volume for the investigated polymers were determined. Differences in network behavior for the aged samples and the effect of chalcogenide (As2S3) particles on the free volume of ureasil network were observed. Swelling experiments using ethyl alcohol showed that the structure of the aged sample network had less swelling ability for the pure ureasil as well as composite. This suggests that the one of factors influencing swelling is the change of the basic ureasil network due to ageing. It is supposed that the network properties obtained by positron annihilation lifetime spectroscopy and swelling experiments could be very helpful to understand better the bio-functionality of the constructed biosensor based on the ureasil-chalcogenide glass composite.

DOI: 10.12693/APhysPolA.132.1515
PACS numbers: 81.05.Lg, 81.07.Pr, 78.70.Bj, 61.25.hp