Esmaspäeval, 13. mail 2019 kell 16.15 toimub Physicumis, W.Ostwaldi 1, seminariruumis D312
Laserspektroskoopia seminar No 270
Taavi Tikk1, Sven Lange1, Tanel Tätte1, Tõnis Paara1, Andres Krumme2
1 Institute of Physics, University of Tartu, Ostwaldi tn 1, Tartu, Estonia
2 Department of Materials and Environmental Technology, Tallinn University of Technology, Ehitajate st 5, Tallinn, Estonia
TiO2:Sm3+ micro and nanospheres as luminescent oxygen sensitive probes in LDPE packaging material
The presentation is based on soon to be published article „TiO2:Sm3+ micro and nanospheres as luminescent oxygen sensitive probes in LDPE (low density polyethylene) packaging material“. The topic is the development of a novel synthesis method of inorganic, low cost and remotely readable trace oxygen sensors and incorporating them into industrial polymer packaging material with the aim to help detect package’s inside atmosphere instabilities after the hot-sealing process. The main target of such sensor film is food industry where sealing quality of high gas barrier food packaging materials is of high importance for increasing food safety and lowering food waste. The sensing material used in the current work is photoluminescent Sm3+ ion doped TiO2 nanoparticle powder which is prepared via liquid phase extraction method by using colloidal solution of Ti(IV) oxysulfate (TiSO4·xH2O) in water as a precursor. Retrieved nano- and microparticles were embedded into LDPE by directly mixing and hot-pressing of the polymer in molten state. The optical response of the doped films to various O2 ambient concentrations are reported in comparison to pristine TiO2:Sm3+ powder. The resulting data gave grounds for further refinement of the oxide particles and detection principle.