Facile process for preparation of PS/PtOEP composite microspheres and their oxygen sensing properties

In this study, the monodispersed PS/PtOEP microspheres were successfully synthesized by dispersion polymerization, in which anhydrous ethanol and ultrapure water as dispersing agent, AIBN as an initiator, styrene as monomer, PtOEP as the fluorescent substance. Polystyrene microspheres with the size of the initiator, dispersant, the amount of monomer and so on, and has nothing to do with PtOEP. We can be obviously seen under scanning electron microscope. When in the same content of PtOEP, the particle size of composite microspheres size increases with increasing monomer concentration. When the excitation wavelength was 362nm, the PtOEP peak measured emission spectrum at 720nm. With the increasing size of composite microspheres, the peak fluorescence intensity changes. From the S-V diagram, we observed that the concentration of luminous intensity of composite microspheres monotonously dependent on oxygen, there is a linear correlation between PtOEP in 720nm fluorescence intensity and the concentration of oxygen. This method can be utilized to reliably monitor the content of oxygen in the system.