Abstract
ABSTRACTUsing a new kind of alkenyl silicon phthalocyanine, styrene (St) and methacrylic acid as monomers and potassium persulfate as an initiator, carboxylated silicon phthalocyanine photosensitive microspheres were synthesized by in-situ emulsion copolymerization. The structure and morphology of the microspheres were characterized by Fourier transform infrared spectroscopy (FT-IR)and scanning electron microscopy. Fluorescence spectrometer was used to characterize the optical property of the microspheres. The experimental results show that silicon phthalocyanine molecules with flexible unsaturated side chains have good compatibility with styrene. With the presence of carboxyl groups, the as-prepared photosensitive microspheres show high monodispersity and stability. On the basis of this, 9,10-diphenylanthracene (DPA) as singlet oxygen indicator was used to evaluate the photosensitivity of the microspheres. In addition, we report a novel phenomenon that the microspheres can be controllable etched by light irradiation with the presence of DPA in a specific solvent.
Highlights
Light-initiated chemiluminescent assay (LiCA), which is a homogeneous immunoassay technology, has been widely applied in analytical chemistry, medical rapid diagnosis and fluorescence sensing [1,2,3]
In this paper, based on our previous work, using alkenyl silicon phthalocyanine, styrene (St) and methacrylic acid (MAA) as monomers and potassium persulfate (KPS) as an initiator, we report a new kind of carboxylated silicon phthalocyanine photosensitive microspheres synthesized by in-situ emulsion copolymerization
We report a kind of carboxylated silicon phthalocyanine photosensitive microspheres synthesized by in-situ emulsion copolymerization
Summary
Light-initiated chemiluminescent assay (LiCA), which is a homogeneous immunoassay technology, has been widely applied in analytical chemistry, medical rapid diagnosis and fluorescence sensing [1,2,3]. The metal-free phthalocyanine compounds have a cavity with a diameter of about 27 nm, which can coordinate with many metal elements or non-metallic element to form a complex compound, for example, copper phthalocyanine, zinc phthalocyanine and silicon phthalocyanine [5,14,15] The introduction of these central atoms brings better performance to phthalocyanine for optical applications. Our previous work shows that the efficiency of the embedding method relies on the nature of the surface groups of the polymer microspheres [19]. For those fluorescent molecules with large structural rigidity, it is difficult to obtain higher fluorescence efficiency by the embedding method. Controllable etching of photosensitive microspheres was validated by an XE-Bio atomic force microscope (AFM) (Park SYSTEMS, Korea)
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